Pub Date : 2024-11-09DOI: 10.1016/j.intermet.2024.108561
Chun Wu , Qunshou Wang , Zhiyong Li , Ling Chang , Kai Wang , Wenli Pei , Qiang Wang
The effect of adding a third-element on disorder-order transition of FePt has been demonstrated using FeCuPt alloy as a model. The introduction of Cu leads to an increase in the ordering degree, and a moderate amount of Cu enhancing the most. Density Functional Theory calculations indicate that the disorder-order transition in FePt is influenced by the ordering temperature and vacancy formation energy. FePtCu alloy with a moderate Cu content exhibits the lowest vacancy formation energy in the L10-phase, which promotes the atom diffusion during annealing and resulting in a higher ordering degree. This study summarizes the annealing temperature, time, and thermodynamic or kinetic conditions required to achieve L10-FePtX alloy with superior ordering degrees. The findings offer valuable insights for selecting suitable third-elements and annealing parameters to produce L10-FePtX alloy with enhanced ordering degrees.
{"title":"The disorder-order transition of FeCuPt nanoparticles with various Cu content","authors":"Chun Wu , Qunshou Wang , Zhiyong Li , Ling Chang , Kai Wang , Wenli Pei , Qiang Wang","doi":"10.1016/j.intermet.2024.108561","DOIUrl":"10.1016/j.intermet.2024.108561","url":null,"abstract":"<div><div>The effect of adding a third-element on disorder-order transition of FePt has been demonstrated using FeCuPt alloy as a model. The introduction of Cu leads to an increase in the ordering degree, and a moderate amount of Cu enhancing the most. Density Functional Theory calculations indicate that the disorder-order transition in FePt is influenced by the ordering temperature and vacancy formation energy. FePtCu alloy with a moderate Cu content exhibits the lowest vacancy formation energy in the <em>L</em>1<sub>0</sub>-phase, which promotes the atom diffusion during annealing and resulting in a higher ordering degree. This study summarizes the annealing temperature, time, and thermodynamic or kinetic conditions required to achieve <em>L</em>1<sub>0</sub>-FePtX alloy with superior ordering degrees. The findings offer valuable insights for selecting suitable third-elements and annealing parameters to produce <em>L</em>1<sub>0</sub>-FePtX alloy with enhanced ordering degrees.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108561"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660109","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}
Pub Date : 2024-11-09DOI: 10.1016/j.intermet.2024.108551
Shuai Wang , Ruyu Tian , Jiayue Wen , Wei Wang , Jiayun Feng , Shang Wang , Yanhong Tian
The rapid advancements in microelectronic devices towards miniaturization and multifunctionality have led to an increasing demand for solder joints that exhibit enhanced mechanical properties and reliability. This study focuses on investigating the high-shear strength of SnPbInBiSb/Cu high-entropy solder joints. The analysis encompasses the microstructure evolution, interfacial reactions, and shear behavior of these solder joints after reflowing at 180 °C. The study reveals the formation of very thin intermetallic compound (IMC) layers, specifically Cu6Sn5 and Cu3Sn, at the SnPbInBiSb/Cu interface with an average thickness of about 1.04 μm following a 10min reflow. Transmission electron microscopy (TEM) analysis illustrates the presence of nanoscale precipitates of InSn3 or Sn3Sb phases dispersed within the Cu6Sn5 IMC. The high mixing entropy of the SnPbInBiSb solder contributes to the suppression of the interfacial IMC growth rate during the reflow process. Notably, the shear strength and fracture behavior of the SnPbInBiSb high-entropy solder joints are significantly influenced by the thickness of the interfacial IMC. In particular, solder joints reflowed at 180 °C for 10 min exhibit a high shear strength of 102.4 MPa with a ductile fracture mode.
{"title":"SnPbInBiSb high-entropy solder joints with inhibited interfacial IMC growth and high shear strength","authors":"Shuai Wang , Ruyu Tian , Jiayue Wen , Wei Wang , Jiayun Feng , Shang Wang , Yanhong Tian","doi":"10.1016/j.intermet.2024.108551","DOIUrl":"10.1016/j.intermet.2024.108551","url":null,"abstract":"<div><div>The rapid advancements in microelectronic devices towards miniaturization and multifunctionality have led to an increasing demand for solder joints that exhibit enhanced mechanical properties and reliability. This study focuses on investigating the high-shear strength of SnPbInBiSb/Cu high-entropy solder joints. The analysis encompasses the microstructure evolution, interfacial reactions, and shear behavior of these solder joints after reflowing at 180 °C. The study reveals the formation of very thin intermetallic compound (IMC) layers, specifically Cu<sub>6</sub>Sn<sub>5</sub> and Cu<sub>3</sub>Sn, at the SnPbInBiSb/Cu interface with an average thickness of about 1.04 μm following a 10min reflow. Transmission electron microscopy (TEM) analysis illustrates the presence of nanoscale precipitates of InSn<sub>3</sub> or Sn<sub>3</sub>Sb phases dispersed within the Cu<sub>6</sub>Sn<sub>5</sub> IMC. The high mixing entropy of the SnPbInBiSb solder contributes to the suppression of the interfacial IMC growth rate during the reflow process. Notably, the shear strength and fracture behavior of the SnPbInBiSb high-entropy solder joints are significantly influenced by the thickness of the interfacial IMC. In particular, solder joints reflowed at 180 °C for 10 min exhibit a high shear strength of 102.4 MPa with a ductile fracture mode.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108551"},"PeriodicalIF":4.3,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660108","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}
Pub Date : 2024-11-08DOI: 10.1016/j.intermet.2024.108558
Xueting Zhao , Kun Zhang , Peng Liu , Qing Guo , Haoyu Wang , Yuanwen Feng , Bing Li
Mn3Pt metal compounds are promising candidates for barocaloric cooling applications for their high thermal conductivity and pressure sensitivity. However, they are constrained by low entropy change and large thermal hysteresis. This study investigates the effects of doping with carbon (C) and nitrogen (N) and substituting with germanium (Ge) on the structure, as well as the thermal and barocaloric effects of Mn3Pt. We found that N and C doping significantly reduces the phase transition temperature and improves pressure sensitivity, although at the cost of reduced entropy change. In contrast, Ge substitution increases the phase transition temperature and enhances the entropy change by 123 %, with Mn3Pt0.8Ge0.2 achieving a maximum entropy change of 22.7 J kg−1 K−1. Additionally, defects were introduced to reduce the phase transition nucleation driving force, thereby lowering the thermal hysteresis to 4 K. This work provides a strategy for the simultaneous optimization of entropy change and thermal hysteresis, advancing the development of efficient and tunable barocaloric materials.
{"title":"Simultaneous optimization of entropy changes and thermal hysteresis in barocaloric compound of Mn3Pt","authors":"Xueting Zhao , Kun Zhang , Peng Liu , Qing Guo , Haoyu Wang , Yuanwen Feng , Bing Li","doi":"10.1016/j.intermet.2024.108558","DOIUrl":"10.1016/j.intermet.2024.108558","url":null,"abstract":"<div><div>Mn<sub>3</sub>Pt metal compounds are promising candidates for barocaloric cooling applications for their high thermal conductivity and pressure sensitivity. However, they are constrained by low entropy change and large thermal hysteresis. This study investigates the effects of doping with carbon (C) and nitrogen (N) and substituting with germanium (Ge) on the structure, as well as the thermal and barocaloric effects of Mn<sub>3</sub>Pt. We found that N and C doping significantly reduces the phase transition temperature and improves pressure sensitivity, although at the cost of reduced entropy change. In contrast, Ge substitution increases the phase transition temperature and enhances the entropy change by 123 %, with Mn<sub>3</sub>Pt<sub>0.8</sub>Ge<sub>0.2</sub> achieving a maximum entropy change of 22.7 J kg<sup>−1</sup> K<sup>−1</sup>. Additionally, defects were introduced to reduce the phase transition nucleation driving force, thereby lowering the thermal hysteresis to 4 K. This work provides a strategy for the simultaneous optimization of entropy change and thermal hysteresis, advancing the development of efficient and tunable barocaloric materials.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108558"},"PeriodicalIF":4.3,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660104","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}
Pub Date : 2024-11-08DOI: 10.1016/j.intermet.2024.108557
Baolei Wu , Weiyuan Yu , Wenqi Zhu , Yang Li
Novel nano-multilayer foils composed of Ni/Al-Al-FeCo/CrNi filler metals were developed for brazing Al0.1CoCrFeNi alloys. These Ni/Al-FeCo/CrNi filler metals, designed using a high-entropy concept, were integrated to increase the mixing entropy and form solid solution structures. This strategic integration was aimed at preventing the formation of intermetallic compounds. The microstructural evolution and shear strength of the brazed joints were investigated by varying the holding time and brazing temperature. The results demonstrated the formation of a defect-free brazing joint, marked by the emergence of a solid solution structure resulting from the higher mixing entropy. With increasing temperature, the contribution of the solid-solution phase to the strengthening effect on the joint was more significant. The maximum shear strengths of the brazed joints were 308.5 MPa and 292.8 MPa at room temperature and 800 °C, respectively. Furthermore, the extended holding time and increased brazing temperature produced a steady increase in the shear strength of the joint with a corresponding transformation in the fracture mechanism from cleavage to ductility. This study introduces a novel process for brazing Al0.1CoCrFeNi and offers a technological paradigm for manufacturing industry at a high temperature (800 °C).
{"title":"A high-strength self-propagating-brazed Al0.1CoCrFeNi joint at high temperatures with nano-multilayer foils composed of Ni/Al-Al-FeCo/CrNi filler metal","authors":"Baolei Wu , Weiyuan Yu , Wenqi Zhu , Yang Li","doi":"10.1016/j.intermet.2024.108557","DOIUrl":"10.1016/j.intermet.2024.108557","url":null,"abstract":"<div><div>Novel nano-multilayer foils composed of Ni/Al-Al-FeCo/CrNi filler metals were developed for brazing Al<sub>0.1</sub>CoCrFeNi alloys. These Ni/Al-FeCo/CrNi filler metals, designed using a high-entropy concept, were integrated to increase the mixing entropy and form solid solution structures. This strategic integration was aimed at preventing the formation of intermetallic compounds. The microstructural evolution and shear strength of the brazed joints were investigated by varying the holding time and brazing temperature. The results demonstrated the formation of a defect-free brazing joint, marked by the emergence of a solid solution structure resulting from the higher mixing entropy. With increasing temperature, the contribution of the solid-solution phase to the strengthening effect on the joint was more significant. The maximum shear strengths of the brazed joints were 308.5 MPa and 292.8 MPa at room temperature and 800 °C, respectively. Furthermore, the extended holding time and increased brazing temperature produced a steady increase in the shear strength of the joint with a corresponding transformation in the fracture mechanism from cleavage to ductility. This study introduces a novel process for brazing Al<sub>0.1</sub>CoCrFeNi and offers a technological paradigm for manufacturing industry at a high temperature (800 °C).</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108557"},"PeriodicalIF":4.3,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660107","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}
Pub Date : 2024-11-07DOI: 10.1016/j.intermet.2024.108559
Z.L. Li , C.Y. Liu
In this study, Al-20 wt%Zn-x wt%Ce alloys (x = 0, 0.1, 0.5, and 1) were fabricated by casting, hot rolling, cold rolling, and solution treatment to investigate the effects of Ce content and rolling route on the microstructure and mechanical properties of high-Zn content Al-Zn-Ce alloys. Ce addition with weight ratio no higher than 0.5 % led to the formation of Al2CeZn2 phases in the Al-20Zn alloy, and the CeZn3 phases were obtained in this alloy when the Ce content increased to 1 %. Rolling effectively disrupted the Ce-containing phases, and the presence of these phases changed the grain structure of the Al-Zn-Ce alloys by affecting their deformation mode during rolling. Dynamic precipitation of Zn phases occurred in the Al-20Zn alloys during rolling. However, the Ce-containing phase consumed a large amount of Zn atoms, and then inhibited the dynamic precipitation of Zn phases in the studied alloys. The alloys with 0.5 wt%Ce addition exhibited the best mechanical properties, and the strengthening mechanism of the Al-Zn-Ce alloys were studied.
本研究通过铸造、热轧、冷轧和固溶处理制造了 Al-20 wt%Zn-x wt%Ce 合金（x = 0、0.1、0.5 和 1），以研究 Ce 含量和轧制路线对高锌含量 Al-Zn-Ce 合金微观结构和力学性能的影响。添加重量比不高于 0.5 % 的 Ce 会在 Al-20Zn 合金中形成 Al2CeZn2 相，当 Ce 含量增加到 1 % 时，合金中会出现 CeZn3 相。轧制有效地破坏了含 Ce 相，这些相的存在通过影响轧制过程中的变形模式改变了 Al-Zn-Ce 合金的晶粒结构。Al-20Zn 合金在轧制过程中发生了锌相的动态沉淀。然而，含 Ce 相消耗了大量 Zn 原子，从而抑制了所研究合金中 Zn 相的动态析出。添加了 0.5 wt%Ce 的合金具有最佳的机械性能，并对 Al-Zn-Ce 合金的强化机理进行了研究。
{"title":"Effect of Ce content and rolling route on the microstructure and mechanical properties of high-Zn content Al-Zn-Ce alloys","authors":"Z.L. Li , C.Y. Liu","doi":"10.1016/j.intermet.2024.108559","DOIUrl":"10.1016/j.intermet.2024.108559","url":null,"abstract":"<div><div>In this study, Al-20 wt%Zn-x wt%Ce alloys (x = 0, 0.1, 0.5, and 1) were fabricated by casting, hot rolling, cold rolling, and solution treatment to investigate the effects of Ce content and rolling route on the microstructure and mechanical properties of high-Zn content Al-Zn-Ce alloys. Ce addition with weight ratio no higher than 0.5 % led to the formation of Al<sub>2</sub>CeZn<sub>2</sub> phases in the Al-20Zn alloy, and the CeZn<sub>3</sub> phases were obtained in this alloy when the Ce content increased to 1 %. Rolling effectively disrupted the Ce-containing phases, and the presence of these phases changed the grain structure of the Al-Zn-Ce alloys by affecting their deformation mode during rolling. Dynamic precipitation of Zn phases occurred in the Al-20Zn alloys during rolling. However, the Ce-containing phase consumed a large amount of Zn atoms, and then inhibited the dynamic precipitation of Zn phases in the studied alloys. The alloys with 0.5 wt%Ce addition exhibited the best mechanical properties, and the strengthening mechanism of the Al-Zn-Ce alloys were studied.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108559"},"PeriodicalIF":4.3,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142660110","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}
Pub Date : 2024-11-05DOI: 10.1016/j.intermet.2024.108549
Jinpeng Zhang, Qingyao Wu, Chuanlong Yang, Zhenhua Yang, Bingbing Yin, Yi Yang
AlCrMoNbTi high entropy alloy (HEA) has the potential to be an excellent oxidation-resistant refractory high entropy alloy (RHEA) but has been limited by an undesirable oxide layer structure. In this work, the initial oxidation behavior of AlCrMoNbTi HEA was investigated by a combination of experiments and DFT calculations. The results indicate that O atoms tend to occupy the adsorption sites containing Ti atoms. Consequently, Ti atoms are more prone to combine with O atoms, resulting in the formation of compounds, which impedes the formation of protective oxides, such as Al2O3 and Cr2O3. Meanwhile, calculations indicate that Cr atoms can form stable Cr-O bonds in a Ti-rich environment, which can be exploited to improve oxidation resistance by modifying the Cr-rich oxide layer.
AlCrMoNbTi 高熵合金 (HEA) 有潜力成为一种出色的抗氧化难熔高熵合金 (RHEA)，但一直受到不良氧化层结构的限制。在这项工作中，通过实验和 DFT 计算相结合的方法研究了 AlCrMoNbTi HEA 的初始氧化行为。结果表明，O 原子倾向于占据含有 Ti 原子的吸附位点。因此，Ti 原子更容易与 O 原子结合，形成化合物，从而阻碍 Al2O3 和 Cr2O3 等保护性氧化物的形成。同时，计算表明，Cr 原子可在富含 Ti 的环境中形成稳定的 Cr-O 键，可通过改变富含 Cr 的氧化物层来提高抗氧化性。
{"title":"Initial oxidation behavior of AlCrMoNbTi high-entropy alloys studied by DFT calculations and experiments","authors":"Jinpeng Zhang, Qingyao Wu, Chuanlong Yang, Zhenhua Yang, Bingbing Yin, Yi Yang","doi":"10.1016/j.intermet.2024.108549","DOIUrl":"10.1016/j.intermet.2024.108549","url":null,"abstract":"<div><div>AlCrMoNbTi high entropy alloy (HEA) has the potential to be an excellent oxidation-resistant refractory high entropy alloy (RHEA) but has been limited by an undesirable oxide layer structure. In this work, the initial oxidation behavior of AlCrMoNbTi HEA was investigated by a combination of experiments and DFT calculations. The results indicate that O atoms tend to occupy the adsorption sites containing Ti atoms. Consequently, Ti atoms are more prone to combine with O atoms, resulting in the formation of compounds, which impedes the formation of protective oxides, such as Al<sub>2</sub>O<sub>3</sub> and Cr<sub>2</sub>O<sub>3</sub>. Meanwhile, calculations indicate that Cr atoms can form stable Cr-O bonds in a Ti-rich environment, which can be exploited to improve oxidation resistance by modifying the Cr-rich oxide layer.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108549"},"PeriodicalIF":4.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142586870","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}
Pub Date : 2024-11-05DOI: 10.1016/j.intermet.2024.108550
Qian Liang, Yaqi Wang, Chendong Shao, Yueqiao Feng, Fenggui Lu
In this study, CuCrZr-Hastelloy X bimetallic structure featuring an ultra-fine grain zone (UFGZ) near the interface were fabricated by laser-directed energy deposition (L-DED). Samples with UFGZ were obtained with 300 °C preheating, whereas samples without preheating did not contain UFGZ. The microstructures and mechanical properties of samples with and without UFGZ were compared. The formation of UFGZ was attributed to the presence of a spherical phase near the interface, which was identified as Ni (Fe, Cr, Mo). Due to the higher melting point of Hastelloy X compared to CuCrZr, Ni elements mixed into CuCrZr with the flow of the molten pool, solidified first, and served as substrates for the heterogeneous nucleation, ultimately promoting the formation of UFGZ. With 300 °C preheating, the hardness of CuCrZr near the interface increased from 115.07 HV to 148.51 HV due to the presence of UFGZ. And the hardness gap near the interface decreased from 172.58 HV to 147.19 HV, which improved the uniformity of mechanical properties. Moreover, the nanoindentation tests results that UFGZ increased the hardness of the zone near the interface from 1.42 GPa to 1.72 GPa. Tensile test results indicated that the UFGZ altered the fracture mode from brittle to ductile. Samples with UFGZ exhibited ductile fracture, while those without UFGZ exhibited brittle fracture. At room temperature, the tensile strength of samples with UFGZ increased from 298.44 MPa to 347.05 MPa. For tests conducted at 400 °C, the tensile strength increased from 165.12 MPa to 229.53 MPa. This enhancement indicated that UFGZ could improve the strength and toughness of the interface, thereby enhancing the interfacial bonding strength. This study is of great significance for improving the interfacial bonding strength of CuCrZr-Hastelloy X bimetallic structures.
{"title":"Effect of ultra-fine grain zone on mechanical properties of CuCrZr-Hastelloy X bimetallic structure manufactured by laser-directed energy deposition","authors":"Qian Liang, Yaqi Wang, Chendong Shao, Yueqiao Feng, Fenggui Lu","doi":"10.1016/j.intermet.2024.108550","DOIUrl":"10.1016/j.intermet.2024.108550","url":null,"abstract":"<div><div>In this study, CuCrZr-Hastelloy X bimetallic structure featuring an ultra-fine grain zone (UFGZ) near the interface were fabricated by laser-directed energy deposition (L-DED). Samples with UFGZ were obtained with 300 °C preheating, whereas samples without preheating did not contain UFGZ. The microstructures and mechanical properties of samples with and without UFGZ were compared. The formation of UFGZ was attributed to the presence of a spherical phase near the interface, which was identified as Ni (Fe, Cr, Mo). Due to the higher melting point of Hastelloy X compared to CuCrZr, Ni elements mixed into CuCrZr with the flow of the molten pool, solidified first, and served as substrates for the heterogeneous nucleation, ultimately promoting the formation of UFGZ. With 300 °C preheating, the hardness of CuCrZr near the interface increased from 115.07 HV to 148.51 HV due to the presence of UFGZ. And the hardness gap near the interface decreased from 172.58 HV to 147.19 HV, which improved the uniformity of mechanical properties. Moreover, the nanoindentation tests results that UFGZ increased the hardness of the zone near the interface from 1.42 GPa to 1.72 GPa. Tensile test results indicated that the UFGZ altered the fracture mode from brittle to ductile. Samples with UFGZ exhibited ductile fracture, while those without UFGZ exhibited brittle fracture. At room temperature, the tensile strength of samples with UFGZ increased from 298.44 MPa to 347.05 MPa. For tests conducted at 400 °C, the tensile strength increased from 165.12 MPa to 229.53 MPa. This enhancement indicated that UFGZ could improve the strength and toughness of the interface, thereby enhancing the interfacial bonding strength. This study is of great significance for improving the interfacial bonding strength of CuCrZr-Hastelloy X bimetallic structures.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108550"},"PeriodicalIF":4.3,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142592697","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}
Pub Date : 2024-11-04DOI: 10.1016/j.intermet.2024.108553
Han Hu , Fangjie Li , Min Liu , Dongye Yang , Zongxin Zhu , Qin Shen , Zhigang Yu
This study examined both theoretically and experimentally the oxidation behavior of AlCoCr0.5Fe2.5Ni2.5 and Al0.25CoCrFeNi alloys in the time for 10 h and 180 h at 800 °C in air atmosphere. The results showed that the weight gain of the dual-phase AlCoCr0.5Fe2.5Ni2.5 alloy followed the parabolic rate law, while this value persisted almost unchanged for the single-phase Al0.25CoCrFeNi alloy at the same oxidizing condition. Surface analysis of the oxide scale confirmed the formation of Al2O3, Cr2O3 and Fe3O4 oxides. Comparing the experimental results with thermodynamic models and Density functional theory (DFT) calculations suggests that Al and Cr are first oxidized in the AlCoCr0.5Fe2.5Ni2.5 and Al0.25CoCrFeNi alloys, respectively, then outer Fe3O4 scale appeared in the two alloys. The weak resistance to high temperature oxidation of AlCoCr0.5Fe2.5Ni2.5 alloy was mainly ascribed to its high fraction of grain and phase boundaries, as well as the fragmented oxide layer formed due to enhanced element diffusion at the FCC/BCC phase boundaries. The element migration and oxidation process of oxide layers in the two alloys were declared based on thermodynamic and DFT calculations.
{"title":"High temperature oxidation behavior of the dual-phase AlCoCr0.5Fe2.5Ni2.5 and single phase Al0.25CoCrFeNi high entropy alloys","authors":"Han Hu , Fangjie Li , Min Liu , Dongye Yang , Zongxin Zhu , Qin Shen , Zhigang Yu","doi":"10.1016/j.intermet.2024.108553","DOIUrl":"10.1016/j.intermet.2024.108553","url":null,"abstract":"<div><div>This study examined both theoretically and experimentally the oxidation behavior of AlCoCr<sub>0.5</sub>Fe<sub>2.5</sub>Ni<sub>2.5</sub> and Al<sub>0.25</sub>CoCrFeNi alloys in the time for 10 h and 180 h at 800 °C in air atmosphere. The results showed that the weight gain of the dual-phase AlCoCr<sub>0.5</sub>Fe<sub>2.5</sub>Ni<sub>2.5</sub> alloy followed the parabolic rate law, while this value persisted almost unchanged for the single-phase Al<sub>0.25</sub>CoCrFeNi alloy at the same oxidizing condition. Surface analysis of the oxide scale confirmed the formation of Al<sub>2</sub>O<sub>3</sub>, Cr<sub>2</sub>O<sub>3</sub> and Fe<sub>3</sub>O<sub>4</sub> oxides. Comparing the experimental results with thermodynamic models and Density functional theory (DFT) calculations suggests that Al and Cr are first oxidized in the AlCoCr<sub>0.5</sub>Fe<sub>2.5</sub>Ni<sub>2.5</sub> and Al<sub>0.25</sub>CoCrFeNi alloys, respectively, then outer Fe<sub>3</sub>O<sub>4</sub> scale appeared in the two alloys. The weak resistance to high temperature oxidation of AlCoCr<sub>0.5</sub>Fe<sub>2.5</sub>Ni<sub>2.5</sub> alloy was mainly ascribed to its high fraction of grain and phase boundaries, as well as the fragmented oxide layer formed due to enhanced element diffusion at the FCC/BCC phase boundaries. The element migration and oxidation process of oxide layers in the two alloys were declared based on thermodynamic and DFT calculations.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108553"},"PeriodicalIF":4.3,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578394","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}
During the investigation of the Cu-As-Sb ternary system, we identified the ternary intermetallic Cu3−x(As,Sb) compound. Its crystal structure was solved and refined by single crystal and powder X-ray diffraction. While the binary Cu3−xAs and Cu3−xSb phases crystallize in the hexagonal Cu3P-type (hP24, P63cm) and cubic anti-BiF3-type (cF16, Fmm), respectively, Cu3−x(As,Sb) adopts the cubic Cu6AsSb prototype (cP32, Pmn). Crystallochemical reasons lead to the exclusion that its structure could be of the UH3-type. Cu3−x(As,Sb) is isotypic with Cu12−xTeSb3; their crystal structure is a stuffed ternary derivative of the Cr3Si-type. SEM-EDX analyses reveal very large compositional ranges for this compound, mostly concerning the Sb/As ratio: 71.1−73.9 at.% Cu, 4.0−24.5 at.% As and 2.5−23.5 at.% Sb, corresponding to about Cu2.5-2.8As0.23-0.98Sb0.23-0.92 (x = 0.2−0.5). The lattice parameter and, consequently, the unit cell volume regularly expand while increasing the Sb/As compositional ratio: a ≈ 7.47 Å for Cu3−xAs0.75Sb0.25, a ≈ 7.65 Å for Cu3−xAs0.25Sb0.75 (averaged values).
Cu3−x(As,Sb) forms either by a peritectic reaction for As-rich compositions, or congruently for the equiatomic Sb/As and Sb-rich compositions. The decomposition- or melting-temperature values decrease as a function of the Sb/As compositional ratio [e.g. peritectic at 710 °C for Cu3−xAs0.75Sb0.25 (Cu72As21Sb7), congruent melting at 690 °C for Cu3−xAs0.50Sb0.50 (Cu72As14Sb14), and at 675 °C for Cu3−xAs0.25Sb0.75 (Cu72As7Sb21)].
Physical properties (electrical resistivity and magnetic susceptibility) indicate that Cu3−x(As,Sb) behaves as a good metal with electrical resistivity decreasing as the Sb/As compositional ratio increases; a peculiar anomaly in the electrical resistivity behavior (heavy-fermions like) was observed at low temperature, the origin of which needs further investigation. The compound is a standard diamagnet.
{"title":"Crystallochemistry, thermodynamic and physical properties of the intermetallic compound Cu3−x(As,Sb)","authors":"Marianne Mödlinger , Alessia Provino , Pavlo Solokha , Serena De Negri , Federico Caglieris , Michele Ceccardi , Cristina Bernini , Pietro Manfrinetti","doi":"10.1016/j.intermet.2024.108526","DOIUrl":"10.1016/j.intermet.2024.108526","url":null,"abstract":"<div><div>During the investigation of the Cu-As-Sb ternary system, we identified the ternary intermetallic Cu<sub>3−x</sub>(As,Sb) compound. Its crystal structure was solved and refined by single crystal and powder X-ray diffraction. While the binary Cu<sub>3−x</sub>As and Cu<sub>3−x</sub>Sb phases crystallize in the hexagonal Cu<sub>3</sub>P-type (<em>hP</em>24, <em>P</em>6<sub>3</sub><em>cm</em>) and cubic anti-BiF<sub>3</sub>-type (<em>cF</em>16, <em>Fm</em><span><math><mover><mn>3</mn><mo>¯</mo></mover></math></span><em>m</em>), respectively, Cu<sub>3−x</sub>(As,Sb) adopts the cubic Cu<sub>6</sub>AsSb prototype (<em>cP</em>32, <em>Pm</em><span><math><mrow><mover><mn>3</mn><mo>‾</mo></mover></mrow></math></span><em>n</em>). Crystallochemical reasons lead to the exclusion that its structure could be of the UH<sub>3</sub>-type. Cu<sub>3−x</sub>(As,Sb) is isotypic with Cu<sub>12−x</sub>TeSb<sub>3</sub>; their crystal structure is a stuffed ternary derivative of the Cr<sub>3</sub>Si-type. SEM-EDX analyses reveal very large compositional ranges for this compound, mostly concerning the Sb/As ratio: 71.1−73.9 at.% Cu, 4.0−24.5 at.% As and 2.5−23.5 at.% Sb, corresponding to about Cu<sub>2.5-2.8</sub>As<sub>0.23-0.98</sub>Sb<sub>0.23-0.92</sub> (x = 0.2−0.5). The lattice parameter and, consequently, the unit cell volume regularly expand while increasing the Sb/As compositional ratio: <em>a</em> ≈ 7.47 Å for Cu<sub>3−x</sub>As<sub>0.75</sub>Sb<sub>0.25</sub>, <em>a</em> ≈ 7.65 Å for Cu<sub>3−x</sub>As<sub>0.25</sub>Sb<sub>0.75</sub> (averaged values).</div><div>Cu<sub>3−x</sub>(As,Sb) forms either by a peritectic reaction for As-rich compositions, or congruently for the equiatomic Sb/As and Sb-rich compositions. The decomposition- or melting-temperature values decrease as a function of the Sb/As compositional ratio [<em>e.g</em>. peritectic at 710 °C for Cu<sub>3−x</sub>As<sub>0.75</sub>Sb<sub>0.25</sub> (Cu<sub>72</sub>As<sub>21</sub>Sb<sub>7</sub>), congruent melting at 690 °C for Cu<sub>3−x</sub>As<sub>0.50</sub>Sb<sub>0.50</sub> (Cu<sub>72</sub>As<sub>14</sub>Sb<sub>14</sub>), and at 675 °C for Cu<sub>3−x</sub>As<sub>0.25</sub>Sb<sub>0.75</sub> (Cu<sub>72</sub>As<sub>7</sub>Sb<sub>21</sub>)].</div><div>Physical properties (electrical resistivity and magnetic susceptibility) indicate that Cu<sub>3−x</sub>(As,Sb) behaves as a good metal with electrical resistivity decreasing as the Sb/As compositional ratio increases; a peculiar anomaly in the electrical resistivity behavior (heavy-fermions like) was observed at low temperature, the origin of which needs further investigation. The compound is a standard diamagnet.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108526"},"PeriodicalIF":4.3,"publicationDate":"2024-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571854","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-10-31DOI: 10.1016/j.intermet.2024.108538
Xuesong Xu , He Liang , Hongsheng Ding , Karl P. Davidson , R.V. Ramanujan , Ruirun Chen , Jingjie Guo , Hengzhi Fu
The high temperature oxidation behavior and mechanical property response of a directionally solidified Ti-46Al-7Nb-0.4W-0.6Cr-0.1B alloy were investigated. The ultimate tensile strength of the alloy at 800 °C, 850 °C and 900 °C are 647 MPa, 590 MPa and 508 MPa, respectively, and the tensile fracture mode changed from brittle cleavage fracture to micro-void accumulation ductile fracture. At lower temperatures Al2O3 forms first, growing along the γ lamellae to form oxide bands aligned with the lamellar orientation. The oxidation mass gain of the alloy after 900 °C/100 h isothermal oxidation is only 0.91 mg/cm2. The oxidation kinetics results show the microalloyed high Nb TiAl alloy has excellent oxidation resistance, which is due to the formation of a TiO2 layer containing Nb, Cr and W, the AlNb2 phase and an Al/Cr rich transition layer above the directionally solidified lamellar matrix.
研究了定向凝固 Ti-46Al-7Nb-0.4W-0.6Cr-0.1B 合金的高温氧化行为和力学性能响应。合金在 800 ℃、850 ℃ 和 900 ℃ 时的极限拉伸强度分别为 647 MPa、590 MPa 和 508 MPa，拉伸断裂模式从脆性劈裂断裂转变为微空洞堆积韧性断裂。在较低温度下，Al2O3 首先形成，沿着 γ 薄片生长，形成与薄片取向一致的氧化带。合金在 900 °C/100 h 等温氧化后的氧化质量增量仅为 0.91 mg/cm2。氧化动力学结果表明，微合金化高 Nb TiAl 合金具有优异的抗氧化性，这是由于在定向凝固的片状基体上方形成了含有 Nb、Cr 和 W 的 TiO2 层、AlNb2 相和富 Al/Cr 过渡层。
{"title":"Oxidation behavior and mechanical properties of a directionally solidified high Nb TiAl based alloy between 800 °C and 900 °C","authors":"Xuesong Xu , He Liang , Hongsheng Ding , Karl P. Davidson , R.V. Ramanujan , Ruirun Chen , Jingjie Guo , Hengzhi Fu","doi":"10.1016/j.intermet.2024.108538","DOIUrl":"10.1016/j.intermet.2024.108538","url":null,"abstract":"<div><div>The high temperature oxidation behavior and mechanical property response of a directionally solidified Ti-46Al-7Nb-0.4W-0.6Cr-0.1B alloy were investigated. The ultimate tensile strength of the alloy at 800 °C, 850 °C and 900 °C are 647 MPa, 590 MPa and 508 MPa, respectively, and the tensile fracture mode changed from brittle cleavage fracture to micro-void accumulation ductile fracture. At lower temperatures Al<sub>2</sub>O<sub>3</sub> forms first, growing along the γ lamellae to form oxide bands aligned with the lamellar orientation. The oxidation mass gain of the alloy after 900 °C/100 h isothermal oxidation is only 0.91 mg/cm<sup>2</sup>. The oxidation kinetics results show the microalloyed high Nb TiAl alloy has excellent oxidation resistance, which is due to the formation of a TiO<sub>2</sub> layer containing Nb, Cr and W, the AlNb<sub>2</sub> phase and an Al/Cr rich transition layer above the directionally solidified lamellar matrix.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"176 ","pages":"Article 108538"},"PeriodicalIF":4.3,"publicationDate":"2024-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571853","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}
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