Intermetallics最新文献_第4页

Influence of Si microalloying strategy on microstructure and room-temperature mechanical properties of as-cast CrMnFeCoNiSix (x=0.1–0.5) high-entropy alloys Si微合金化策略对铸态CrMnFeCoNiSix （x=0.1 ~ 0.5）高熵合金组织和室温力学性能的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-31 DOI: 10.1016/j.intermet.2025.109140

Bingxi Yu , Yongsheng Ren , Wenhui Ma , Yun Lei , Kazuki Morita , Shu Zhan

Enhancing the room-temperature strength of CrMnFeCoNi high-entropy alloys (HEAs) through elemental doping represents an economical alternative. In this study, a series of Si-doped as-cast CrMnFeCoNiSi_x (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) HEAs were fabricated via vacuum induction melting (VIM). The effects of Si content over a wide range on the microstructural evolution and mechanical properties of these alloys was systematically investigated. The results indicate that exceeding the solubility limit of Si promotes the formation of hard and brittle Mn–Ni–Si silicide phases. With increasing Si content, the microstructure transitions from a single FCC phase to a dual-phase structure comprising FCC and silicide, with the silicide morphology evolving from initially granular to dendritic. Consequently, both hardness and strength of the as-cast alloys are significantly improved: hardness increases from 139.05 ± 4.54 HV₁ to 308.31 ± 7.05 HV₁, and yield strength rises from 194 ± 8.50 MPa to 422 ± 11.00 MPa. However, excessive Si addition severely degrades ductility. By analyzing the microstructure-property relationship, the strengthening mechanism of the CrMnFeCoNiSi-based HEAs was evaluated. The analysis indicates that precipitation strengthening by the hard and brittle silicide phases is the primary mechanism responsible for the strength enhancement.

通过元素掺杂提高crmnnfeconi高熵合金（HEAs）的室温强度是一种经济可行的方法。本研究采用真空感应熔炼（VIM）法制备了一系列掺硅的铸态CrMnFeCoNiSix (x = 0,0.1, 0.2, 0.3, 0.4, 0.5) HEAs。系统地研究了大范围硅含量对合金组织演变和力学性能的影响。结果表明，超过Si的溶解度限制，有利于形成硬脆的Mn-Ni-Si硅化物相。随着Si含量的增加，微观结构由单一的FCC相转变为由FCC和硅化物组成的双相结构，硅化物的形貌由最初的粒状演变为枝晶状。铸态合金的硬度和强度均有显著提高，硬度由139.05±4.54 HV1提高到308.31±7.05 HV1，屈服强度由194±8.50 MPa提高到422±11.00 MPa。然而，过量的Si添加严重降低了塑性。通过分析crmnfeconsi基HEAs的微观组织-性能关系，对其强化机理进行了评价。分析表明，硬脆硅化物相的析出强化是强度增强的主要机制。

{"title":"Influence of Si microalloying strategy on microstructure and room-temperature mechanical properties of as-cast CrMnFeCoNiSix (x=0.1–0.5) high-entropy alloys","authors":"Bingxi Yu , Yongsheng Ren , Wenhui Ma , Yun Lei , Kazuki Morita , Shu Zhan","doi":"10.1016/j.intermet.2025.109140","DOIUrl":"10.1016/j.intermet.2025.109140","url":null,"abstract":"<div><div>Enhancing the room-temperature strength of CrMnFeCoNi high-entropy alloys (HEAs) through elemental doping represents an economical alternative. In this study, a series of Si-doped as-cast CrMnFeCoNiSi<sub>x</sub> (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5) HEAs were fabricated via vacuum induction melting (VIM). The effects of Si content over a wide range on the microstructural evolution and mechanical properties of these alloys was systematically investigated. The results indicate that exceeding the solubility limit of Si promotes the formation of hard and brittle Mn–Ni–Si silicide phases. With increasing Si content, the microstructure transitions from a single FCC phase to a dual-phase structure comprising FCC and silicide, with the silicide morphology evolving from initially granular to dendritic. Consequently, both hardness and strength of the as-cast alloys are significantly improved: hardness increases from 139.05 ± 4.54 HV<sub>1</sub> to 308.31 ± 7.05 HV<sub>1</sub>, and yield strength rises from 194 ± 8.50 MPa to 422 ± 11.00 MPa. However, excessive Si addition severely degrades ductility. By analyzing the microstructure-property relationship, the strengthening mechanism of the CrMnFeCoNiSi-based HEAs was evaluated. The analysis indicates that precipitation strengthening by the hard and brittle silicide phases is the primary mechanism responsible for the strength enhancement.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109140"},"PeriodicalIF":4.8,"publicationDate":"2025-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880135","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Multiscale precipitates in a cross-alloyed Al-Cu-Zn-Mg alloy to enhance intergranular corrosion resistance via microalloying of Sc and Hf 交叉合金Al-Cu-Zn-Mg合金中的多尺度析出物通过Sc和Hf的微合金化来增强晶间耐蚀性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-29 DOI: 10.1016/j.intermet.2025.109141

Zhiqiang Yu , Jin Qin , Wang Zhao , Bin Wang , Zhiyue Shi , Rui Wang , Xianwei Ren , Shaobin Bai , Gang Wang , Yandong Jia , Zhijie Yan

The effects of microalloying of Sc and Hf on the microstructure and intergranular corrosion (IGC) behavior of a cross-alloyed Al-Cu-Zn-Mg alloy were investigated. Results indicate that the addition of Sc and Hf significantly refines grain size in both as-cast and hot-rolled alloys, altering grain structure and multiscale precipitates characteristics. It was revealed that the corrosion behavior of the alloy transformed from severe intragranular corrosion into IGC after the addition of Sc. In contrast, the Hf-microalloyed alloy exhibited predominantly pitting with excellent IGC resistance. This was attributed to the segregation of Hf atoms at grain boundaries (GBs) suppressed the continuous precipitation of η and S phases, narrowing the precipitation-free zone (PFZ). The discontinuous distribution of grain boundary precipitates (GBPs) and the narrowed PFZ inhibited the anodic dissolution, thereby reducing IGC sensitivity. Interestingly, the Hf-containing alloy exhibit smaller grain sizes, a higher proportion of low-angle grain boundaries (LAGBs) and coincident site lattices (CSL), which synergistically contribute to the enhanced IGC resistance.

研究了Sc和Hf微合金化对交叉合金Al-Cu-Zn-Mg合金显微组织和晶间腐蚀行为的影响。结果表明，Sc和Hf的加入显著细化了铸态和热轧态合金的晶粒尺寸，改变了晶粒组织和多尺度析出物特征。结果表明，Sc加入后，合金的腐蚀行为由严重的晶内腐蚀转变为IGC腐蚀，而hf微合金则以点蚀为主，具有优异的抗IGC腐蚀性能。这是由于晶界处Hf原子的偏析抑制了η相和S相的连续析出，缩小了无析出区（PFZ）。晶界沉淀（GBPs）的不连续分布和PFZ的变窄抑制了阳极溶解，从而降低了IGC的敏感性。有趣的是，含氢合金的晶粒尺寸更小，低角晶界（LAGBs）和重合点阵（CSL）的比例更高，这些都有助于增强抗IGC性能。

{"title":"Multiscale precipitates in a cross-alloyed Al-Cu-Zn-Mg alloy to enhance intergranular corrosion resistance via microalloying of Sc and Hf","authors":"Zhiqiang Yu , Jin Qin , Wang Zhao , Bin Wang , Zhiyue Shi , Rui Wang , Xianwei Ren , Shaobin Bai , Gang Wang , Yandong Jia , Zhijie Yan","doi":"10.1016/j.intermet.2025.109141","DOIUrl":"10.1016/j.intermet.2025.109141","url":null,"abstract":"<div><div>The effects of microalloying of Sc and Hf on the microstructure and intergranular corrosion (IGC) behavior of a cross-alloyed Al-Cu-Zn-Mg alloy were investigated. Results indicate that the addition of Sc and Hf significantly refines grain size in both as-cast and hot-rolled alloys, altering grain structure and multiscale precipitates characteristics. It was revealed that the corrosion behavior of the alloy transformed from severe intragranular corrosion into IGC after the addition of Sc. In contrast, the Hf-microalloyed alloy exhibited predominantly pitting with excellent IGC resistance. This was attributed to the segregation of Hf atoms at grain boundaries (GBs) suppressed the continuous precipitation of η and S phases, narrowing the precipitation-free zone (PFZ). The discontinuous distribution of grain boundary precipitates (GBPs) and the narrowed PFZ inhibited the anodic dissolution, thereby reducing IGC sensitivity. Interestingly, the Hf-containing alloy exhibit smaller grain sizes, a higher proportion of low-angle grain boundaries (LAGBs) and coincident site lattices (CSL), which synergistically contribute to the enhanced IGC resistance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109141"},"PeriodicalIF":4.8,"publicationDate":"2025-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145880134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Enhanced magnetostriction of polycrystalline Fe-Ga alloy by trace Pr doping 微量Pr掺杂增强多晶Fe-Ga合金的磁致伸缩性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-27 DOI: 10.1016/j.intermet.2025.109138

Haizheng Yu , Te Yao , Jiande Liu , Zhenghua He , Hongbo Hao , Shengyuan Wang , Xunye Zhang , Siqian Zhang , Yuhui Sha , Xiaofei Zhu , Lijia Chen

Excellent magnetostriction in Fe-Ga alloy depends on the grain orientation and the characteristics of nanoheterogeneity. In this paper, a synergistic regulation of the preferred <100>-oriented texture and nano-sized L6₀ phase was obtained in arc-melting of polycrystalline (Fe₈₁Ga₁₉)_100-xPr_x alloys. A saturation magnetostriction (3/2λ_s) of (Fe₈₁Ga₁₉)_99.95Pr_0.05 alloy is improved to 374 ppm, representing a 160 % enhancement as compared to Fe₈₁Ga₁₉ alloy, approaching the magnetostriction of single crystals by rapid single crystal growth and Fe-Ga-RE thin sheets by secondary recrystallization. The effect of Pr element on the magnetostriction of Fe₈₁Ga₁₉ alloy is analyzed at the millimeter scale (grain orientation), micrometer scale (precipitation), and nanometer scale (nanoheterogeneity). The significant enhancement of the magnetostriction in (Fe₈₁Ga₁₉)_99.95Pr_0.05 alloy is attributed to the larger lattice distortion in the A2 matrix due to the dispersedly distributed nano-sized L6₀ phases in the entire columnar matrix grains with η texture.

Fe-Ga合金优异的磁致伸缩性能取决于晶粒取向和纳米非均质性。本文研究了多晶（Fe81Ga19）100-xPrx合金电弧熔炼过程中优选的<；100>；取向织构与纳米级L60相的协同调节。（Fe81Ga19）99.95Pr0.05合金的饱和磁致伸缩（3/2λs）达到374 ppm，比Fe81Ga19合金提高了160%，接近单晶的磁致伸缩（单晶快速生长）和Fe-Ga-RE薄片的二次再结晶。在毫米尺度（晶粒取向）、微米尺度（析出）和纳米尺度（纳米非均质性）上分析了Pr元素对Fe81Ga19合金磁致伸缩的影响。（Fe81Ga19）99.95Pr0.05合金的磁致伸缩显著增强是由于在具有η织构的整个柱状基体晶粒中分散分布的纳米级L60相使A2基体中的晶格畸变增大。

{"title":"Enhanced magnetostriction of polycrystalline Fe-Ga alloy by trace Pr doping","authors":"Haizheng Yu , Te Yao , Jiande Liu , Zhenghua He , Hongbo Hao , Shengyuan Wang , Xunye Zhang , Siqian Zhang , Yuhui Sha , Xiaofei Zhu , Lijia Chen","doi":"10.1016/j.intermet.2025.109138","DOIUrl":"10.1016/j.intermet.2025.109138","url":null,"abstract":"<div><div>Excellent magnetostriction in Fe-Ga alloy depends on the grain orientation and the characteristics of nanoheterogeneity. In this paper, a synergistic regulation of the preferred <100>-oriented texture and nano-sized L6<sub>0</sub> phase was obtained in arc-melting of polycrystalline (Fe<sub>81</sub>Ga<sub>19</sub>)<sub>100-<em>x</em></sub>Pr<sub><em>x</em></sub> alloys. A saturation magnetostriction (3/2<em>λ</em><sub>s</sub>) of (Fe<sub>81</sub>Ga<sub>19</sub>)<sub>99.95</sub>Pr<sub>0.05</sub> alloy is improved to 374 ppm, representing a 160 % enhancement as compared to Fe<sub>81</sub>Ga<sub>19</sub> alloy, approaching the magnetostriction of single crystals by rapid single crystal growth and Fe-Ga-RE thin sheets by secondary recrystallization. The effect of Pr element on the magnetostriction of Fe<sub>81</sub>Ga<sub>19</sub> alloy is analyzed at the millimeter scale (grain orientation), micrometer scale (precipitation), and nanometer scale (nanoheterogeneity). The significant enhancement of the magnetostriction in (Fe<sub>81</sub>Ga<sub>19</sub>)<sub>99.95</sub>Pr<sub>0.05</sub> alloy is attributed to the larger lattice distortion in the A2 matrix due to the dispersedly distributed nano-sized L6<sub>0</sub> phases in the entire columnar matrix grains with η texture.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109138"},"PeriodicalIF":4.8,"publicationDate":"2025-12-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Investigation of friction and wear performance of laser additively manufactured AlCrFeNiMo high entropy alloy coating at temperatures from RT to 900 °C 激光增材制备AlCrFeNiMo高熵合金涂层在室温~ 900℃的摩擦磨损性能研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-26 DOI: 10.1016/j.intermet.2025.109136

Cuong Nguyen , Yingang Liu , Anh Kiet Tieu , Haiwei Chang , Xuan Thang Nguyen , Guanyu Deng , Mingxing Zhang , Huijun Li , Lihong Su

In this study, AlCrFeNiMo high-entropy alloy (HEA) coatings have been successfully fabricated by laser cladding method using the mixed elemental powders as the raw material. Two different laser powers (200 W for HEA1 and 350 W for HEA2) were used, aiming to investigate the influence of processing parameters on the phase constitution, microstructure and properties of as-cladded HEA coatings. It has been found that both AlCrFeNiMo HEA coating is consisted of BCC1, BCC2 and Mo-rich phases. HEA2 exhibited finer microstructure, reduced elemental segregation, and slightly higher hardness (833.3 HV) compared to HEA1 (808.6 HV). Tribological testing from room temperature to 900 °C showed that HEA2 consistently achieved lower friction coefficients and wear rates with lowest values of 0.29 and 0.68 × 10⁻⁵ mm³/Nm at 900 °C, respectively. Cross-sectional and surface analyses revealed a transition from abrasive wear at room temperature to oxidative wear at 900 °C, with HEA2 forming a denser, stable tribo-oxide layer enriched in Al and Cr. These results highlight that optimizing laser processing enhances the microstructural integrity and high-temperature wear resistance of AlCrFeNiMo HEA coatings, making them promising for extreme service conditions.

本研究以混合元素粉末为原料，采用激光熔覆法制备了AlCrFeNiMo高熵合金（HEA）涂层。采用两种不同的激光功率（HEA1为200 W， HEA2为350 W），研究了工艺参数对包覆HEA涂层的相组成、显微组织和性能的影响。结果表明，AlCrFeNiMo HEA涂层均由BCC1、BCC2和富mo相组成。与HEA1 （808.6 HV）相比，HEA2的显微组织更细，元素偏析减少，硬度（833.3 HV）略高。从室温到900°C的摩擦学测试表明，HEA2在900°C时始终保持较低的摩擦系数和磨损率，最低值分别为0.29和0.68 × 10−5 mm3/Nm。截面和表面分析显示，HEA涂层从室温下的磨粒磨损转变为900℃下的氧化磨损，HEA2形成了更致密、更稳定的富含Al和Cr的摩擦氧化层。这些结果表明，优化激光加工可以提高AlCrFeNiMo HEA涂层的显微组织完整性和高温耐磨性，使其在极端使用条件下具有前景。

{"title":"Investigation of friction and wear performance of laser additively manufactured AlCrFeNiMo high entropy alloy coating at temperatures from RT to 900 °C","authors":"Cuong Nguyen , Yingang Liu , Anh Kiet Tieu , Haiwei Chang , Xuan Thang Nguyen , Guanyu Deng , Mingxing Zhang , Huijun Li , Lihong Su","doi":"10.1016/j.intermet.2025.109136","DOIUrl":"10.1016/j.intermet.2025.109136","url":null,"abstract":"<div><div>In this study, AlCrFeNiMo high-entropy alloy (HEA) coatings have been successfully fabricated by laser cladding method using the mixed elemental powders as the raw material. Two different laser powers (200 W for HEA1 and 350 W for HEA2) were used, aiming to investigate the influence of processing parameters on the phase constitution, microstructure and properties of as-cladded HEA coatings. It has been found that both AlCrFeNiMo HEA coating is consisted of BCC1, BCC2 and Mo-rich phases. HEA2 exhibited finer microstructure, reduced elemental segregation, and slightly higher hardness (833.3 HV) compared to HEA1 (808.6 HV). Tribological testing from room temperature to 900 °C showed that HEA2 consistently achieved lower friction coefficients and wear rates with lowest values of 0.29 and 0.68 × 10<sup>−5</sup> mm<sup>3</sup>/Nm at 900 °C, respectively. Cross-sectional and surface analyses revealed a transition from abrasive wear at room temperature to oxidative wear at 900 °C, with HEA2 forming a denser, stable tribo-oxide layer enriched in Al and Cr. These results highlight that optimizing laser processing enhances the microstructural integrity and high-temperature wear resistance of AlCrFeNiMo HEA coatings, making them promising for extreme service conditions.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109136"},"PeriodicalIF":4.8,"publicationDate":"2025-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836812","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Effect of V content on the microstructure and corrosion behavior of (CoCrFeNiMn) 100-xVx high entropy alloys V含量对（CoCrFeNiMn） 100-xVx高熵合金组织和腐蚀行为的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-25 DOI: 10.1016/j.intermet.2025.109137

Feng Han , Chunyang Li , Zula Pai , Yu Zhang , Caimei Wang

A novel type of corrosion-resistant (CoCrFeNiMn)_100-xV_x (x = 5, 10, 15, 20) high-entropy alloys (HEAs) were developed, and the effect of V content on their corrosion behavior in 3.5 wt% NaCl solution was systematically investigated through comprehensive microstructural characterization, electrochemical impedance spectroscopy, electrochemical noise measurement, and immersion corrosion tests. The results show that the V₁₀ alloy exhibits the best corrosion resistance, as evidenced by the highest charge transfer resistance and the lowest pitting susceptibility. The enhanced performance is attributed to the selective enrichment of V, which regulates the electrochemical potential difference, thereby improving corrosion performance. Furthermore, none of the alloys exhibits obvious pitting corrosion, which is mainly attributed to the synergistic role of V and Cr in promoting the formation of dense oxides layer. These Cr/V-rich oxides significantly enhance the stability of the alloy, effectively blocking chloride penetration and inhibiting the initiation and propagation of pitting corrosion.

研制了一种新型耐腐蚀（CoCrFeNiMn）100-xVx （x = 5,10,15,20）高熵合金（HEAs），并通过综合显微组织表征、电化学阻抗谱、电化学噪声测量和浸没腐蚀试验系统地研究了V含量对其在3.5 wt% NaCl溶液中腐蚀行为的影响。结果表明，V10合金具有最高的电荷转移电阻和最低的点蚀敏感性，具有最佳的耐蚀性。性能的增强是由于V的选择性富集调节了电化学电位差，从而改善了腐蚀性能。此外，没有一种合金表现出明显的点蚀现象，这主要是由于V和Cr的协同作用促进了致密氧化物层的形成。这些富含Cr/ v的氧化物显著提高了合金的稳定性，有效地阻止了氯化物的渗透，抑制了点蚀的发生和扩展。

{"title":"Effect of V content on the microstructure and corrosion behavior of (CoCrFeNiMn) 100-xVx high entropy alloys","authors":"Feng Han , Chunyang Li , Zula Pai , Yu Zhang , Caimei Wang","doi":"10.1016/j.intermet.2025.109137","DOIUrl":"10.1016/j.intermet.2025.109137","url":null,"abstract":"<div><div>A novel type of corrosion-resistant (CoCrFeNiMn)<sub>100-x</sub>V<sub>x</sub> (x = 5, 10, 15, 20) high-entropy alloys (HEAs) were developed, and the effect of V content on their corrosion behavior in 3.5 wt% NaCl solution was systematically investigated through comprehensive microstructural characterization, electrochemical impedance spectroscopy, electrochemical noise measurement, and immersion corrosion tests. The results show that the V<sub>10</sub> alloy exhibits the best corrosion resistance, as evidenced by the highest charge transfer resistance and the lowest pitting susceptibility. The enhanced performance is attributed to the selective enrichment of V, which regulates the electrochemical potential difference, thereby improving corrosion performance. Furthermore, none of the alloys exhibits obvious pitting corrosion, which is mainly attributed to the synergistic role of V and Cr in promoting the formation of dense oxides layer. These Cr/V-rich oxides significantly enhance the stability of the alloy, effectively blocking chloride penetration and inhibiting the initiation and propagation of pitting corrosion.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109137"},"PeriodicalIF":4.8,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836810","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Influence of Ni on the microstructure and wear resistance of AlNbMoTa0.5 refractory high-entropy alloy laser cladding coating fabricated on Ti6Al4V Ni对Ti6Al4V基AlNbMoTa0.5耐火高熵合金激光熔覆层组织及耐磨性的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-25 DOI: 10.1016/j.intermet.2025.109135

S.S. Liu , J.F. Wang , G.L. Zhao , X.H. Wang

AlNbMoTa_0.5 laser cladding coatings with different Ni additions were successfully fabricated on Ti6Al4V surfaces through synchronous powder feeding. Through characterization of the coating microstructure and wear resistance, it was found that: Due to small atomic radius, element Ni induces lattice distortion in the AlNbMoTa_0.5 refractory high-entropy alloy. This lattice distortion is particularly pronounced when the Ni addition is low. With a melting point significantly lower than that of the high-melting-point principal elements, element Ni primarily segregates in the inter-dendritic regions of the BCC solid solution, and the size of these inter-dendritic regions gradually increases with higher Ni additions. Due to its lower formation enthalpy, the element Ni promotes the formation of AlNiTi-intermetallic compounds in the inter-dendritic regions. Additionally, driven by the increased Ti/Al concentration ratio in the melt pool, Ti₃Al intermetallic compounds are formed. Meanwhile, the addition of Ni contributes to grain refinement through heterogeneous nucleation.

In terms of properties, with the increase of Ni addition, the microhardness of the coating improves due to the formation of hard intermetallic compounds or solid solutions in the inter-dendritic regions. Simultaneously, the addition of Ni enhances the room-temperature wear resistance of the coating, attributable to the combined effects of grain refinement strengthening and the pinning effect provided by the well-compatible intermetallic compounds. Regarding high-temperature wear resistance, the addition of Ni enhances the elevated temperature properties of the by slowing the oxidation rate of the inter-dendritic Ti element, owing to its stronger chemical affinity with Ti.

采用同步给粉的方法，成功制备了不同Ni添加量的AlNbMoTa0.5激光熔覆涂层。通过对涂层组织和耐磨性的表征，发现：Ni元素由于原子半径小，在AlNbMoTa0.5难熔高熵合金中引起晶格畸变；当Ni添加量较低时，这种晶格畸变尤为明显。由于熔点明显低于高熔点主元素，元素Ni主要偏析在BCC固溶体的枝晶间区域，并且随着Ni添加量的增加，这些枝晶间区域的大小逐渐增大。由于其较低的生成焓，Ni元素促进了alniti -金属间化合物在枝晶间区域的形成。此外，在熔池中Ti/Al浓度比增大的驱动下，形成Ti3Al金属间化合物。同时，Ni的加入通过非均相形核促进晶粒细化。在性能方面，随着Ni添加量的增加，由于在枝晶间区域形成了坚硬的金属间化合物或固溶体，涂层的显微硬度得到提高。同时，Ni的加入提高了涂层的室温耐磨性，这是由于晶粒细化强化和良好相容性的金属间化合物提供的钉住作用的共同作用。在高温耐磨性方面，由于Ni与Ti具有更强的化学亲和力，通过减缓枝晶间Ti元素的氧化速率，提高了合金的高温性能。

{"title":"Influence of Ni on the microstructure and wear resistance of AlNbMoTa0.5 refractory high-entropy alloy laser cladding coating fabricated on Ti6Al4V","authors":"S.S. Liu , J.F. Wang , G.L. Zhao , X.H. Wang","doi":"10.1016/j.intermet.2025.109135","DOIUrl":"10.1016/j.intermet.2025.109135","url":null,"abstract":"<div><div>AlNbMoTa<sub>0.5</sub> laser cladding coatings with different Ni additions were successfully fabricated on Ti6Al4V surfaces through synchronous powder feeding. Through characterization of the coating microstructure and wear resistance, it was found that: Due to small atomic radius, element Ni induces lattice distortion in the AlNbMoTa<sub>0.5</sub> refractory high-entropy alloy. This lattice distortion is particularly pronounced when the Ni addition is low. With a melting point significantly lower than that of the high-melting-point principal elements, element Ni primarily segregates in the inter-dendritic regions of the BCC solid solution, and the size of these inter-dendritic regions gradually increases with higher Ni additions. Due to its lower formation enthalpy, the element Ni promotes the formation of AlNiTi-intermetallic compounds in the inter-dendritic regions. Additionally, driven by the increased Ti/Al concentration ratio in the melt pool, Ti<sub>3</sub>Al intermetallic compounds are formed. Meanwhile, the addition of Ni contributes to grain refinement through heterogeneous nucleation.</div><div>In terms of properties, with the increase of Ni addition, the microhardness of the coating improves due to the formation of hard intermetallic compounds or solid solutions in the inter-dendritic regions. Simultaneously, the addition of Ni enhances the room-temperature wear resistance of the coating, attributable to the combined effects of grain refinement strengthening and the pinning effect provided by the well-compatible intermetallic compounds. Regarding high-temperature wear resistance, the addition of Ni enhances the elevated temperature properties of the by slowing the oxidation rate of the inter-dendritic Ti element, owing to its stronger chemical affinity with Ti.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109135"},"PeriodicalIF":4.8,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836809","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Mo and boriding effect on microstructure, micro-nano mechanical properties and wear behavior of Al0.25CoCr1.5FeNi HEA Mo和硼化对Al0.25CoCr1.5FeNi HEA显微组织、微纳力学性能和磨损性能的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-25 DOI: 10.1016/j.intermet.2025.109139

İbrahim Çalış , Mustafa Sabri Gök , Azmi Erdoğan

CoCrFeNi-based high-entropy alloys exhibit promising properties under various stress conditions and are currently the subject of extensive research. However, they can be significantly strengthened by adding different alloying elements and even undergoing surface modifications. For this purpose, this study investigated the effects of Mo addition and boriding on the microstructure, mechanical properties, and wear behavior of Al_0.25CoCr_1.5FeNi alloy. The boriding process, applied at 950 °C, resulted in a dense, continuous, approximately 50 μm thick borided zone on the surface. The phase changes in the alloy caused by the addition of Mo resulted in an increase in hardness from 6.7 GPa to 15.3 GPa. After the boriding process, surface hardness of 16.2–22.3 GPa was achieved. Elastic modulus values of 230 GPa were achieved with Mo and 295 GPa with boriding. Thanks to the increased mechanical properties, changes in alloy composition and boriding processes have reduced wear losses by up to 99 %. The coefficient of friction decreased from a range of 0.54–0.56 to a range of 0.31–0.34, depending on the applied load. This study includes a successful proposal for increasing the surface hardness and wear resistance of HEAs.

cocrfeni基高熵合金在各种应力条件下表现出良好的性能，是目前广泛研究的课题。然而，通过添加不同的合金元素，甚至进行表面改性，它们可以显着增强。为此，本研究研究了Mo添加和渗硼对Al0.25CoCr1.5FeNi合金组织、力学性能和磨损行为的影响。在950°C的渗硼过程中，在表面形成了致密的、连续的、约50 μm厚的渗硼区。Mo的加入使合金发生相变，硬度由6.7 GPa提高到15.3 GPa。渗硼处理后，表面硬度达到16.2 ~ 22.3 GPa。Mo合金的弹性模量为230 GPa，硼化合金的弹性模量为295 GPa。由于机械性能的提高，合金成分和渗硼工艺的变化使磨损损失减少了99%。根据施加的载荷，摩擦系数从0.54-0.56下降到0.31-0.34。本研究成功提出了提高HEAs表面硬度和耐磨性的方法。

{"title":"Mo and boriding effect on microstructure, micro-nano mechanical properties and wear behavior of Al0.25CoCr1.5FeNi HEA","authors":"İbrahim Çalış , Mustafa Sabri Gök , Azmi Erdoğan","doi":"10.1016/j.intermet.2025.109139","DOIUrl":"10.1016/j.intermet.2025.109139","url":null,"abstract":"<div><div>CoCrFeNi-based high-entropy alloys exhibit promising properties under various stress conditions and are currently the subject of extensive research. However, they can be significantly strengthened by adding different alloying elements and even undergoing surface modifications. For this purpose, this study investigated the effects of Mo addition and boriding on the microstructure, mechanical properties, and wear behavior of Al<sub>0.25</sub>CoCr<sub>1.5</sub>FeNi alloy. The boriding process, applied at 950 °C, resulted in a dense, continuous, approximately 50 μm thick borided zone on the surface. The phase changes in the alloy caused by the addition of Mo resulted in an increase in hardness from 6.7 GPa to 15.3 GPa. After the boriding process, surface hardness of 16.2–22.3 GPa was achieved. Elastic modulus values of 230 GPa were achieved with Mo and 295 GPa with boriding. Thanks to the increased mechanical properties, changes in alloy composition and boriding processes have reduced wear losses by up to 99 %. The coefficient of friction decreased from a range of 0.54–0.56 to a range of 0.31–0.34, depending on the applied load. This study includes a successful proposal for increasing the surface hardness and wear resistance of HEAs.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109139"},"PeriodicalIF":4.8,"publicationDate":"2025-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145836813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructural and tribological characteristics of boroaluminized Monel K-500 superalloy 硼铝化蒙奈尔K-500高温合金的显微组织和摩擦学特性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-19 DOI: 10.1016/j.intermet.2025.109131

İlyas Türkmen

This study investigates the surface enhancement of Monel K-500 alloy through the boroaluminizing process. Boroaluminized layers were produced by sequential powder-pack boriding (850–950 °C, 6 h) followed by aluminizing at 750 °C for 6 h. Optical and scanning electron microscopy examinations demonstrated that the boroaluminized layers were compact, with a thickness of approximately 129–133 μm. Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses were employed to identify the elemental distribution and phase composition of the layers. The layers formed in the boroaluminized samples consisted of various nickel borides, nickel aluminides, and complex intermetallic phases. The microhardness of the layers was measured to range from 890 HV to 1060 HV. Ball-on-disk wear tests carried out under dry sliding conditions at ambient temperature revealed that the boroaluminized samples exhibited a 3.2–3.6-fold improvement in wear resistance compared to the untreated substrate. Furthermore, the friction coefficient was reduced by approximately 1.8 times. In accordance with the Daimler-Benz Rockwell-C indentation tests, acceptable adhesion strength was confirmed exclusively for the BA90 sample. These results highlight the potential of boroaluminizing as an effective method for significantly enhancing the mechanical and tribological performance of Monel K-500, making it suitable for demanding applications.

研究了蒙乃尔K-500合金经硼渗铝处理后的表面强化效果。采用粉末包渗（850-950°C, 6 h）和750°C渗铝（6 h）法制备了硼铝层。光学和扫描电镜检查表明，硼铝层致密，厚度约为129-133 μm。利用能量色散x射线能谱（EDX）和x射线衍射（XRD）分析确定了各层的元素分布和相组成。在硼铝化样品中形成的层由各种镍硼化物、镍铝化物和复杂的金属间相组成。测得各层显微硬度在890hv ~ 1060hv之间。在干滑动条件下进行的球盘磨损试验表明，与未处理的衬底相比，硼铝化样品的耐磨性提高了3.2 - 3.6倍。摩擦系数降低了约1.8倍。根据戴姆勒-奔驰罗克韦尔- c压痕试验，仅为BA90样品确认了可接受的粘附强度。这些结果突出了硼铝化作为一种有效方法的潜力，可以显着提高蒙奈尔K-500的机械和摩擦学性能，使其适合苛刻的应用。

{"title":"Microstructural and tribological characteristics of boroaluminized Monel K-500 superalloy","authors":"İlyas Türkmen","doi":"10.1016/j.intermet.2025.109131","DOIUrl":"10.1016/j.intermet.2025.109131","url":null,"abstract":"<div><div>This study investigates the surface enhancement of Monel K-500 alloy through the boroaluminizing process. Boroaluminized layers were produced by sequential powder-pack boriding (850–950 °C, 6 h) followed by aluminizing at 750 °C for 6 h. Optical and scanning electron microscopy examinations demonstrated that the boroaluminized layers were compact, with a thickness of approximately 129–133 μm. Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses were employed to identify the elemental distribution and phase composition of the layers. The layers formed in the boroaluminized samples consisted of various nickel borides, nickel aluminides, and complex intermetallic phases. The microhardness of the layers was measured to range from 890 HV to 1060 HV. Ball-on-disk wear tests carried out under dry sliding conditions at ambient temperature revealed that the boroaluminized samples exhibited a 3.2–3.6-fold improvement in wear resistance compared to the untreated substrate. Furthermore, the friction coefficient was reduced by approximately 1.8 times. In accordance with the Daimler-Benz Rockwell-C indentation tests, acceptable adhesion strength was confirmed exclusively for the BA90 sample. These results highlight the potential of boroaluminizing as an effective method for significantly enhancing the mechanical and tribological performance of Monel K-500, making it suitable for demanding applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109131"},"PeriodicalIF":4.8,"publicationDate":"2025-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145786551","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrigendum to Novel Ti-based metallic glass coating free of toxic elements for bio-implant applications [Intermetallics 188 (2026) 109085] 生物植入物用新型不含有毒元素的钛基金属玻璃涂层的勘误表[金属间化合物188 (2026)109085]

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-19 DOI: 10.1016/j.intermet.2025.109134

Rongqiang Yan , Peng Du , Rongtao Zhu , Haoyang Xuan , Runchi Li , Zhiheng Jiang , Zhongyuan Suo , Jindong Liu , Liang Zhang , Guoqiang Xie

引用次数: 0

Evolution of oriented lamellar microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy fabricated by vacuum twin-roll strip casting 真空双辊带铸Ti-48Al-2Cr-2Nb合金取向层状组织演变及拉伸性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-12-18 DOI: 10.1016/j.intermet.2025.109130

Chengran Chai , Yang Wang , Lin Peng , Shuai Zhao , Yuanxiang Zhang , Feng Fang , Xiaoming Zhang

TiAl alloy is a lightweight structural material with excellent high-temperature resistance, demonstrating significant potential for applications within the 600–900 °C range. However, its widespread adoption has been hindered by inadequate room-temperature ductility and a limited thermomechanical processing window. In this work, near net shape vacuum twin-roll strip casting(TRSC) technology was employed to fabricate Ti-48Al-2Cr-2Nb alloy, offering a novel approach to enhance the workability of TiAl alloys. Benefiting from the directional solidification and sub-rapid solidification characteristics of TRSC, the alloy exhibited strong preferred orientations of (111)γ and (0001)α₂, enhancing its plastic deformation capability. Furthermore, the average lamellar spacing was approximately 285 nm, with lamellar interfaces nearly parallel to the rolling direction (0–10° relative to the RD). The ultra-fine lamellar structure significantly improved the strength of the alloy. Tensile tests revealed that the room temperature strength reached 721 ± 19 MPa. When deformed at 850 °C, the fracture mode transitions from brittle fracture to ductile fracture, resulting in an excellent combination of elongation (31.2 ± 2.2 %) and tensile strength (402 ± 22 MPa). This study provides a promising way to improve the workability of TiAl alloy, which promotes the application of thin-sheet components.

TiAl合金是一种轻质结构材料，具有优异的耐高温性能，在600-900°C范围内显示出巨大的应用潜力。然而，它的广泛采用受到室温延展性不足和有限的热机械加工窗口的阻碍。采用近净形真空双辊带材铸造（TRSC）技术制备Ti-48Al-2Cr-2Nb合金，为提高TiAl合金的可加工性提供了一条新途径。利用TRSC的定向凝固和亚快速凝固特性，合金表现出较强的(111)γ和(0001)α2取向，增强了塑性变形能力。此外，平均片层间距约为285 nm，片层界面几乎平行于轧制方向（相对于RD 0-10°）。超细层状组织显著提高了合金的强度。拉伸试验表明，室温强度达到721±19 MPa。在850℃下变形时，断裂模式由脆性断裂转变为韧性断裂，获得了良好的伸长率（31.2±2.2%）和抗拉强度（402±22 MPa）的组合。该研究为提高TiAl合金的可加工性提供了一条有希望的途径，从而促进了薄板件的应用。

{"title":"Evolution of oriented lamellar microstructure and tensile properties of Ti-48Al-2Cr-2Nb alloy fabricated by vacuum twin-roll strip casting","authors":"Chengran Chai , Yang Wang , Lin Peng , Shuai Zhao , Yuanxiang Zhang , Feng Fang , Xiaoming Zhang","doi":"10.1016/j.intermet.2025.109130","DOIUrl":"10.1016/j.intermet.2025.109130","url":null,"abstract":"<div><div>TiAl alloy is a lightweight structural material with excellent high-temperature resistance, demonstrating significant potential for applications within the 600–900 °C range. However, its widespread adoption has been hindered by inadequate room-temperature ductility and a limited thermomechanical processing window. In this work, near net shape vacuum twin-roll strip casting(TRSC) technology was employed to fabricate Ti-48Al-2Cr-2Nb alloy, offering a novel approach to enhance the workability of TiAl alloys. Benefiting from the directional solidification and sub-rapid solidification characteristics of TRSC, the alloy exhibited strong preferred orientations of (111)γ and (0001)α<sub>2</sub>, enhancing its plastic deformation capability. Furthermore, the average lamellar spacing was approximately 285 nm, with lamellar interfaces nearly parallel to the rolling direction (0–10° relative to the RD). The ultra-fine lamellar structure significantly improved the strength of the alloy. Tensile tests revealed that the room temperature strength reached 721 ± 19 MPa. When deformed at 850 °C, the fracture mode transitions from brittle fracture to ductile fracture, resulting in an excellent combination of elongation (31.2 ± 2.2 %) and tensile strength (402 ± 22 MPa). This study provides a promising way to improve the workability of TiAl alloy, which promotes the application of thin-sheet components.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109130"},"PeriodicalIF":4.8,"publicationDate":"2025-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145786550","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0