Pub Date : 2024-06-13DOI: 10.1007/s40195-024-01714-z
Xue Li, Qingzhen Zhao, Hao Su, Ji Chen, Chuansong Wu
Joining dissimilar Mg/Cu alloys was still an intractable problem because of the excessive intermetallic compounds (IMCs) and poor mechanical properties using conventional welding methods. In the present study, friction stir welding was employed for the butt joining of dissimilar AZ31B Mg-alloy and T2 pure Cu plates. Defect-free Mg/Cu joints were obtained with Mg-RS and Cu-AS configuration, at a welding speed of 50 mm/min and tool rotating speeds of 325 r/min, 625 r/min and 925 r/min. At the joining interface, both Mg2Cu and MgCu2 IMC phases were observed, with a clear, uniform and continuous IMCs layer composed of two sub-layers, layer-A of Mg + Mg2Cu and layer-B of Mg2Cu + MgCu2. The maximum ultimate tensile strength of the Mg/Cu friction stir welding joint reached 130 MPa at 925 r/min due to enhanced mechanical interlocking between Mg and Cu, as well as sufficient metallurgical bonding at the joining interface with an IMCs layer thickness in the range of 1.0–2.0 μm.
{"title":"Intermetallic Compounds Formation in Dissimilar Friction Stir Welding of Mg/Cu Alloys","authors":"Xue Li, Qingzhen Zhao, Hao Su, Ji Chen, Chuansong Wu","doi":"10.1007/s40195-024-01714-z","DOIUrl":"10.1007/s40195-024-01714-z","url":null,"abstract":"<div><p>Joining dissimilar Mg/Cu alloys was still an intractable problem because of the excessive intermetallic compounds (IMCs) and poor mechanical properties using conventional welding methods. In the present study, friction stir welding was employed for the butt joining of dissimilar AZ31B Mg-alloy and T2 pure Cu plates. Defect-free Mg/Cu joints were obtained with Mg-RS and Cu-AS configuration, at a welding speed of 50 mm/min and tool rotating speeds of 325 r/min, 625 r/min and 925 r/min. At the joining interface, both Mg<sub>2</sub>Cu and MgCu<sub>2</sub> IMC phases were observed, with a clear, uniform and continuous IMCs layer composed of two sub-layers, layer-A of Mg + Mg<sub>2</sub>Cu and layer-B of Mg<sub>2</sub>Cu + MgCu<sub>2</sub>. The maximum ultimate tensile strength of the Mg/Cu friction stir welding joint reached 130 MPa at 925 r/min due to enhanced mechanical interlocking between Mg and Cu, as well as sufficient metallurgical bonding at the joining interface with an IMCs layer thickness in the range of 1.0–2.0 μm.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 9","pages":"1523 - 1532"},"PeriodicalIF":2.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141346004","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 : 2024-06-13DOI: 10.1007/s40195-024-01715-y
Shasha Qu, Yingju Li, Bingyu Lu, Cuiping Wang, Yuansheng Yang
The effects of B addition on microstructure and mechanical properties of a γ′-strengthened CoNi-base superalloy are investigated. The addition of B leads to a substantial increase in the volume fraction of both the eutectic structure and borides. The CoNi-base alloy shows a high solubility limit for the element B. Borides become noticeable in the area surrounding the eutectic structure after the B level exceeds 0.46 at.%. It is found that the compression property and stress rupture life of the 4W2Ta alloys exhibit an initial rise followed by a subsequent drop as the B content gradually increases from 0.08 to 0.78 at.%. The 4W2Ta0.46B alloy demonstrates the most excellent high-temperature strength and stress rupture life, revealing that a moderate amount of B in the alloy noticeably enhances its mechanical properties by enhancing the grain boundary cohesion.
研究了添加硼对γ′强化钴镍基超级合金的微观结构和机械性能的影响。硼的添加导致共晶结构和硼化物的体积分数大幅增加。当硼元素含量超过 0.46 at.% 时,共晶结构周围区域的硼化物变得明显。研究发现,随着 B 含量从 0.08%逐渐增加到 0.78%,4W2Ta 合金的压缩性能和应力断裂寿命会出现先上升后下降的现象。4W2Ta0.46B 合金表现出最优异的高温强度和应力断裂寿命,这表明合金中适量的 B 可以增强晶界内聚力,从而显著提高其机械性能。
{"title":"Effects of Boron Addition on the Microstructure and Mechanical Properties of γ′-Strengthened Directionally Solidified CoNi-Base Superalloy","authors":"Shasha Qu, Yingju Li, Bingyu Lu, Cuiping Wang, Yuansheng Yang","doi":"10.1007/s40195-024-01715-y","DOIUrl":"10.1007/s40195-024-01715-y","url":null,"abstract":"<div><p>The effects of B addition on microstructure and mechanical properties of a γ′-strengthened CoNi-base superalloy are investigated. The addition of B leads to a substantial increase in the volume fraction of both the eutectic structure and borides. The CoNi-base alloy shows a high solubility limit for the element B. Borides become noticeable in the area surrounding the eutectic structure after the B level exceeds 0.46 at.%. It is found that the compression property and stress rupture life of the 4W2Ta alloys exhibit an initial rise followed by a subsequent drop as the B content gradually increases from 0.08 to 0.78 at.%. The 4W2Ta0.46B alloy demonstrates the most excellent high-temperature strength and stress rupture life, revealing that a moderate amount of B in the alloy noticeably enhances its mechanical properties by enhancing the grain boundary cohesion.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 8","pages":"1438 - 1452"},"PeriodicalIF":2.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141345129","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 : 2024-06-13DOI: 10.1007/s40195-024-01701-4
Long Liu, Zijian Zhou, Jie Yu, Xinguang Wang, Chuanyong Cui, Rui Zhang, Yizhou Zhou, Xiaofeng Sun
The hot deformation behavior of a newly developed Ni–W–Cr superalloy for use in 800 °C molten salt reactors (MSRs) was looked into by isothermal compression tests in the temperature range of 1050–1200 °C with a strain rate of 0.001–1 s−1 under a true strain of 0.693. An Arrhenius-type model for the Ni–W–Cr superalloy was constructed by fitting the corrected flow stress data. In this model, the effect of dispersion of solid solution elements during thermal deformation on microstructure evolution was considered, as well as the effects of friction and adiabatic heating on the temperature and strain rate-dependent variation of flow stresses. The hot deformation activation energy of the Ni–W–Cr superalloy was 323 kJ/mol, which was less than that of the Hastelloy N alloy (currently used in MSRs). According to the rectified flow stress data, processing maps were created. In conjunction with the corresponding deformation microstructures, the flow instability domains of the Ni–W–Cr superalloy were determined to be 1050–1160 °C/0.03–1 s−1 and 1170–1200 °C/0.001–0.09 s−1. In these deformation conditions, a locally inhomogeneous microstructure was caused by flow—i.e., incomplete dynamic recrystallization and hot working parameters should avoid sliding into these domains. The ideal processing hot deformation domain for the Ni–W–Cr superalloy was determined to be 1170–1200 °C/0.6–1 s−1.
{"title":"Hot Deformation Behavior and Workability of a New Ni–W–Cr Superalloy for Molten Salt Reactors","authors":"Long Liu, Zijian Zhou, Jie Yu, Xinguang Wang, Chuanyong Cui, Rui Zhang, Yizhou Zhou, Xiaofeng Sun","doi":"10.1007/s40195-024-01701-4","DOIUrl":"10.1007/s40195-024-01701-4","url":null,"abstract":"<div><p>The hot deformation behavior of a newly developed Ni–W–Cr superalloy for use in 800 °C molten salt reactors (MSRs) was looked into by isothermal compression tests in the temperature range of 1050–1200 °C with a strain rate of 0.001–1 s<sup>−1</sup> under a true strain of 0.693. An Arrhenius-type model for the Ni–W–Cr superalloy was constructed by fitting the corrected flow stress data. In this model, the effect of dispersion of solid solution elements during thermal deformation on microstructure evolution was considered, as well as the effects of friction and adiabatic heating on the temperature and strain rate-dependent variation of flow stresses. The hot deformation activation energy of the Ni–W–Cr superalloy was 323 kJ/mol, which was less than that of the Hastelloy N alloy (currently used in MSRs). According to the rectified flow stress data, processing maps were created. In conjunction with the corresponding deformation microstructures, the flow instability domains of the Ni–W–Cr superalloy were determined to be 1050–1160 °C/0.03–1 s<sup>−1</sup> and 1170–1200 °C/0.001–0.09 s<sup>−1</sup>. In these deformation conditions, a locally inhomogeneous microstructure was caused by flow—i.e., incomplete dynamic recrystallization and hot working parameters should avoid sliding into these domains. The ideal processing hot deformation domain for the Ni–W–Cr superalloy was determined to be 1170–1200 °C/0.6–1 s<sup>−1</sup>.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 8","pages":"1453 - 1466"},"PeriodicalIF":2.9,"publicationDate":"2024-06-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40195-024-01701-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141347896","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 : 2024-06-06DOI: 10.1007/s40195-024-01719-8
Gang Zeng, Hong Liu, Jing-Peng Xiong, Jian-Long Li, Yong Liu
Zirconium (Zr) emerges as the most effective grain refiner for magnesium (Mg) alloys incorporating Zr. Typically, Zr is introduced in the form of an Mg–Zr master alloy. However, within Mg–Zr master alloys, Zr predominantly exists in a particle form, which tends to aggregate due to attractive van der Waals forces. The clustered Zr is prone to settling, thereby reducing its refining impact on Mg alloys. In this work, a combined pretreatment process for Mg–Zr master alloys was proposed, encompassing the introduction of a physical field to intervene the agglomeration of particle Zr and the employ of high-temperature dissolution and peritectic reactions to promote the solid solution of Zr. The results demonstrate that the particle Zr within the pretreated Mg–Zr master alloy is effectively dispersed and refined, and greater solute Zr levels can be achieved. The subsequent grain refinement ability was studied on a typical Mg–6Zn–0.6Zr (wt%) alloy. The outcome highlights that an improvement in the grain refinement efficacy (32.4%) of Mg–Zr master alloys was obtained with a holding time of 60 min. The pretreated Mg–Zr master alloy significantly augments the efficiency of grain refinement for Mg alloys through a synergistic strategy involving heterogeneous nucleation and solute-driven growth restriction. The crucial factor in achieving effective grain refinement of Zr in Mg alloys lies in regulating the presence and morphology of Zr in the Mg–Zr master alloy, distinguishing between particle Zr and solute Zr. This study introduces a novel method for developing more efficient Mg–Zr refiners.
{"title":"Enhanced Grain Refining Effect of Mg–Zr Master Alloy on Magnesium Alloys via a Synergistic Strategy Involving Heterogeneous Nucleation and Solute-Driven Growth Restriction","authors":"Gang Zeng, Hong Liu, Jing-Peng Xiong, Jian-Long Li, Yong Liu","doi":"10.1007/s40195-024-01719-8","DOIUrl":"10.1007/s40195-024-01719-8","url":null,"abstract":"<div><p>Zirconium (Zr) emerges as the most effective grain refiner for magnesium (Mg) alloys incorporating Zr. Typically, Zr is introduced in the form of an Mg–Zr master alloy. However, within Mg–Zr master alloys, Zr predominantly exists in a particle form, which tends to aggregate due to attractive van der Waals forces. The clustered Zr is prone to settling, thereby reducing its refining impact on Mg alloys. In this work, a combined pretreatment process for Mg–Zr master alloys was proposed, encompassing the introduction of a physical field to intervene the agglomeration of particle Zr and the employ of high-temperature dissolution and peritectic reactions to promote the solid solution of Zr. The results demonstrate that the particle Zr within the pretreated Mg–Zr master alloy is effectively dispersed and refined, and greater solute Zr levels can be achieved. The subsequent grain refinement ability was studied on a typical Mg–6Zn–0.6Zr (wt%) alloy. The outcome highlights that an improvement in the grain refinement efficacy (32.4%) of Mg–Zr master alloys was obtained with a holding time of 60 min. The pretreated Mg–Zr master alloy significantly augments the efficiency of grain refinement for Mg alloys through a synergistic strategy involving heterogeneous nucleation and solute-driven growth restriction. The crucial factor in achieving effective grain refinement of Zr in Mg alloys lies in regulating the presence and morphology of Zr in the Mg–Zr master alloy, distinguishing between particle Zr and solute Zr. This study introduces a novel method for developing more efficient Mg–Zr refiners.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 8","pages":"1354 - 1366"},"PeriodicalIF":2.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377277","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 : 2024-06-06DOI: 10.1007/s40195-024-01717-w
Ze-Xin Bai, Kun-Kun Deng, Ze-Qi Du, Kai-Bo Nie, Chao Xu, Quan-Xin Shi
The Al2O3 laminated preforms with different layers thickness were prepared by freezing casting in present work. Then, the Al2O3p/AZ91 magnesium matrix laminated materials were obtained by infiltrating the AZ91 alloy melt into the Al2O3 laminated preform based on pressure infiltration process. Subsequently, the influence of freezing temperature on the microstructure, mechanical properties and fracture behavior of magnesium-based laminates was investigated. The results indicated that with the decrease of freezing temperature, the thickness of Al2O3 layers decreases gradually, the number of layers increases obviously, and the interlayers spacing decreases. Accompanied with the decrease of interlayers spacing, the size of Mg17Al12 phase precipitated in the AZ91 alloy layers was refined, and the compression strength and strain were both improved obviously. The micro-cracks initiated in Al2O3 layers during loading process, while the AZ91 layers could effectively suppress the initiation and propagation of micro-cracks. Furthermore, the changing layers structure influenced by the decrease of freezing temperature had significant inhibiting effect on the initiation and propagation of micro-cracks, which endowed the Al2O3p/AZ91 magnesium matrix laminated materials with better strength and toughness. Notably, the best compression properties of Al2O3p/AZ91 magnesium matrix laminated materials could be obtained at the freezing temperature of − 50 °C, the compression strength and elastic modulus of which were the 160% and 250% of monolithic AZ91 alloy, respectively.
{"title":"Microstructure and Mechanical Properties of Al2O3p/AZ91 Magnesium Matrix Laminated Material Adjusted by Freezing Temperature","authors":"Ze-Xin Bai, Kun-Kun Deng, Ze-Qi Du, Kai-Bo Nie, Chao Xu, Quan-Xin Shi","doi":"10.1007/s40195-024-01717-w","DOIUrl":"10.1007/s40195-024-01717-w","url":null,"abstract":"<div><p>The Al<sub>2</sub>O<sub>3</sub> laminated preforms with different layers thickness were prepared by freezing casting in present work. Then, the Al<sub>2</sub>O<sub>3p</sub>/AZ91 magnesium matrix laminated materials were obtained by infiltrating the AZ91 alloy melt into the Al<sub>2</sub>O<sub>3</sub> laminated preform based on pressure infiltration process. Subsequently, the influence of freezing temperature on the microstructure, mechanical properties and fracture behavior of magnesium-based laminates was investigated. The results indicated that with the decrease of freezing temperature, the thickness of Al<sub>2</sub>O<sub>3</sub> layers decreases gradually, the number of layers increases obviously, and the interlayers spacing decreases. Accompanied with the decrease of interlayers spacing, the size of Mg<sub>17</sub>Al<sub>12</sub> phase precipitated in the AZ91 alloy layers was refined, and the compression strength and strain were both improved obviously. The micro-cracks initiated in Al<sub>2</sub>O<sub>3</sub> layers during loading process, while the AZ91 layers could effectively suppress the initiation and propagation of micro-cracks. Furthermore, the changing layers structure influenced by the decrease of freezing temperature had significant inhibiting effect on the initiation and propagation of micro-cracks, which endowed the Al<sub>2</sub>O<sub>3p</sub>/AZ91 magnesium matrix laminated materials with better strength and toughness. Notably, the best compression properties of Al<sub>2</sub>O<sub>3p</sub>/AZ91 magnesium matrix laminated materials could be obtained at the freezing temperature of − 50 °C, the compression strength and elastic modulus of which were the 160% and 250% of monolithic AZ91 alloy, respectively.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 11","pages":"1819 - 1829"},"PeriodicalIF":2.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141552569","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}
The Zn0.6Cu wires are fabricated into stents for the potential biodegradable application of nasal wound healing. The degradation behavior of Zn0.6Cu stents in 0.9 wt% NaCl at 36.5 °C is evaluated. It shows that the untreated Zn0.6Cu stent experiences severe crevice corrosion with acceleration and autocatalytic effects within the micro-cracks and ruptures at 4.67 ± 1.15 d, with the average corrosion rate of 0.28 mm y−1. Fortunately, the anodic polarization (AP) + hydrothermal (H) conversion coating, consisting of ZnCO3, Zn(OH)2 and ZnO, could inhibit the crevice corrosion significantly by reducing the cathode/anode ratio, extending the rupture time up to 16.50 ± 2.95 d, with the average corrosion rate of 0.14 mm y−1. This research indicates that the biodegradable Zn-based stent has some potential applications in nasal wound recovery area.
{"title":"Degradation Behavior of Zn–Cu Stents with Different Coatings in Sodium Chloride Solution","authors":"Xingpeng Liao, Jialuo Huang, Zhilin Liu, Jingru Guo, Dajiang Zheng, Pengbo Chen, Fuyong Cao","doi":"10.1007/s40195-024-01721-0","DOIUrl":"10.1007/s40195-024-01721-0","url":null,"abstract":"<div><p>The Zn0.6Cu wires are fabricated into stents for the potential biodegradable application of nasal wound healing. The degradation behavior of Zn0.6Cu stents in 0.9 wt% NaCl at 36.5 °C is evaluated. It shows that the untreated Zn0.6Cu stent experiences severe crevice corrosion with acceleration and autocatalytic effects within the micro-cracks and ruptures at 4.67 ± 1.15 d, with the average corrosion rate of 0.28 mm y<sup>−1</sup>. Fortunately, the anodic polarization (AP) + hydrothermal (H) conversion coating, consisting of ZnCO<sub>3</sub>, Zn(OH)<sub>2</sub> and ZnO, could inhibit the crevice corrosion significantly by reducing the cathode/anode ratio, extending the rupture time up to 16.50 ± 2.95 d, with the average corrosion rate of 0.14 mm y<sup>−1</sup>. This research indicates that the biodegradable Zn-based stent has some potential applications in nasal wound recovery area.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 9","pages":"1564 - 1580"},"PeriodicalIF":2.9,"publicationDate":"2024-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141377810","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}
Magnesium and its alloys have attracting rising attention as one of biodegradable metallic materials. However, the rapid corrosion and severe localized corrosion still hinder their extensive applications in clinics. In this study, micro-alloying of Ca (≤ 0.1 wt%) into Mg0.5Zn0.2Ge alloy developed in our previous work was explored to further enhance the corrosion resistance and alleviate the localized corrosion of the alloy. The results reveal that the addition of Ca leads to the transformation of the cathodic Mg2Ge phase in Mg0.5Zn0.2Ca alloy into anodic MgCaGe phase in Ca-containing alloys, thereby changing the galvanic couples in alloys during immersion. The preferential dissolution of MgCaGe phase promotes the participation of Ca and Ge into the formation of corrosion products, resulting in the enrichment of Ca and Ge in the outmost of corrosion product layer, which stabilizes and passivates the corrosion product layer on Mg alloy surface. Additionally, the enrichment of Zn at the corrosion interface seems to further hinder the corrosion of Mg matrix. All of these factors confer a slower and more uniform corrosion on Mg0.5Zn0.2GexCa (x < 0.1 wt%) alloy, which provides favorable candidates for the further processing to gain suitable biodegradable Mg alloys.
镁及其合金作为一种可生物降解的金属材料,日益受到人们的关注。然而,快速腐蚀和严重的局部腐蚀仍然阻碍着它们在临床中的广泛应用。在本研究中,为了进一步提高镁0.5锌0.2锗合金的耐腐蚀性并减轻其局部腐蚀,我们探索了在镁0.5锌0.2锗合金中加入钙(≤ 0.1 wt%)的微合金化方法。结果表明,Ca 的加入导致 Mg0.5Zn0.2Ca 合金中的阴极 Mg2Ge 相转变为含 Ca 合金中的阳极 MgCaGe 相,从而改变了合金在浸泡过程中的电偶。MgCaGe 相的优先溶解促进了 Ca 和 Ge 参与腐蚀产物的形成,导致 Ca 和 Ge 在腐蚀产物层的最外层富集,从而稳定和钝化了 Mg 合金表面的腐蚀产物层。此外,腐蚀界面上 Zn 的富集似乎进一步阻碍了镁基体的腐蚀。所有这些因素都使 Mg0.5Zn0.2GexCa (x < 0.1 wt%) 合金的腐蚀速度更慢、更均匀,这为进一步加工以获得合适的可生物降解镁合金提供了有利条件。
{"title":"Effect of Ca Micro-Alloying on the Microstructure and Anti-Corrosion Property of Mg0.5Zn0.2Ge Alloy","authors":"Bishan Cheng, Depeng Li, Baikang Xing, Ruiqing Hou, Pingli Jiang, Shijie Zhu, Shaokang Guan","doi":"10.1007/s40195-024-01703-2","DOIUrl":"10.1007/s40195-024-01703-2","url":null,"abstract":"<div><p>Magnesium and its alloys have attracting rising attention as one of biodegradable metallic materials. However, the rapid corrosion and severe localized corrosion still hinder their extensive applications in clinics. In this study, micro-alloying of Ca (≤ 0.1 wt%) into Mg0.5Zn0.2Ge alloy developed in our previous work was explored to further enhance the corrosion resistance and alleviate the localized corrosion of the alloy. The results reveal that the addition of Ca leads to the transformation of the cathodic Mg<sub>2</sub>Ge phase in Mg0.5Zn0.2Ca alloy into anodic MgCaGe phase in Ca-containing alloys, thereby changing the galvanic couples in alloys during immersion. The preferential dissolution of MgCaGe phase promotes the participation of Ca and Ge into the formation of corrosion products, resulting in the enrichment of Ca and Ge in the outmost of corrosion product layer, which stabilizes and passivates the corrosion product layer on Mg alloy surface. Additionally, the enrichment of Zn at the corrosion interface seems to further hinder the corrosion of Mg matrix. All of these factors confer a slower and more uniform corrosion on Mg0.5Zn0.2Ge<i>x</i>Ca (<i>x</i> < 0.1 wt%) alloy, which provides favorable candidates for the further processing to gain suitable biodegradable Mg alloys.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 7","pages":"1147 - 1160"},"PeriodicalIF":2.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415351","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 : 2024-05-31DOI: 10.1007/s40195-024-01722-z
Jie Lu, Yanhui Li, Shuang Ma, Wanping Li, Feng Bao, Zhengwang Zhu, Qiaoshi Zeng, Haifeng Zhang, Man Yao, Wei Zhang
In this work, a series of Co-based ternary Co–Er–B bulk metallic glasses (BMGs) with excellent soft magnetic properties and high strength were developed, and the local atomic structure of a typical Co71.5Er3.5B25 metallic glass was studied through in situ high-energy synchrotron X-ray diffraction and ab initio molecular dynamics simulations. The results reveal that the BMG samples can be obtained in a composition region of Co68.5–71.5Er3.5–4B25–27.5 by a conventional copper-mold casting method. The Co–Er–B metallic glasses possess stronger atomic bond strengths and denser local atomic packing structure composed of a higher fraction of icosahedral-like clusters but fewer deformed body-centered cubic and crystal-like polyhedrons, and they exhibit slower atomic diffusion behaviors during solidification, as compared to Co–Y–B counterparts. The enhancement in structural stability and the retardation of atomic-ordered diffusion lead to the better glass-forming ability of the Co–Er–B alloys. The smaller magnetic anisotropy energy in the Co–Er–B metallic glasses results in a lower coercivity of less than 1.3 A/m. The Co–Er–B BMGs exhibit high-yield strength of 3560–3969 MPa along with distinct plasticity of around 0.50%.
本研究开发了一系列具有优异软磁性能和高强度的 Co 基三元 Co-Er-B 块状金属玻璃(BMGs),并通过原位高能同步辐射 X 射线衍射和 ab initio 分子动力学模拟研究了典型 Co71.5Er3.5B25 金属玻璃的局部原子结构。研究结果表明,BMG 样品可通过传统的铜模铸造法在 Co68.5-71.5Er3.5-4B25-27.5 的成分区域内获得。与 Co-Y-B 金属玻璃相比,Co-Er-B 金属玻璃具有更强的原子结合强度和更致密的局部原子堆积结构,其中包括更多的类二十面体簇,但变形的体心立方和类晶体多面体较少。结构稳定性的增强和原子有序扩散的减缓使 Co-Er-B 合金具有更好的玻璃化能力。Co-Er-B 金属玻璃中较小的磁各向异性能导致其矫顽力低于 1.3 A/m。Co-Er-B BMG 的屈服强度高达 3560-3969 兆帕,塑性约为 0.50%。
{"title":"Novel Soft Magnetic Co-Based Ternary Co–Er–B Bulk Metallic Glasses","authors":"Jie Lu, Yanhui Li, Shuang Ma, Wanping Li, Feng Bao, Zhengwang Zhu, Qiaoshi Zeng, Haifeng Zhang, Man Yao, Wei Zhang","doi":"10.1007/s40195-024-01722-z","DOIUrl":"10.1007/s40195-024-01722-z","url":null,"abstract":"<div><p>In this work, a series of Co-based ternary Co–Er–B bulk metallic glasses (BMGs) with excellent soft magnetic properties and high strength were developed, and the local atomic structure of a typical Co<sub>71.5</sub>Er<sub>3.5</sub>B<sub>25</sub> metallic glass was studied through in situ high-energy synchrotron X-ray diffraction and ab initio molecular dynamics simulations. The results reveal that the BMG samples can be obtained in a composition region of Co<sub>68.5–71.5</sub>Er<sub>3.5–4</sub>B<sub>25–27.5</sub> by a conventional copper-mold casting method. The Co–Er–B metallic glasses possess stronger atomic bond strengths and denser local atomic packing structure composed of a higher fraction of icosahedral-like clusters but fewer deformed body-centered cubic and crystal-like polyhedrons, and they exhibit slower atomic diffusion behaviors during solidification, as compared to Co–Y–B counterparts. The enhancement in structural stability and the retardation of atomic-ordered diffusion lead to the better glass-forming ability of the Co–Er–B alloys. The smaller magnetic anisotropy energy in the Co–Er–B metallic glasses results in a lower coercivity of less than 1.3 A/m. The Co–Er–B BMGs exhibit high-yield strength of 3560–3969 MPa along with distinct plasticity of around 0.50%.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 9","pages":"1633 - 1642"},"PeriodicalIF":2.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415364","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}
A refractory high entropy alloy Ti62Nb12Mo12Ta12W2 was prepared by mechanical alloying and spark plasma sintering. The microstructure and mechanical properties of the Ti62Nb12Mo12Ta12W2 alloy were analyzed. The experimental results show that the microstructure of the alloy is composed of two BCC phases, an FCC precipitated phase, and the precipitated phase which is a mixture of TiC, TiN and TiO. The alloy exhibits good room temperature compressive properties. The plasticity of the sample sintered at 1550 °C can reach 10.8%, and for the sample sintered at 1600 °C, the yield strength can be up to 2032 MPa, in the meantime the plasticity is 9.4%. The alloy also shows high strength at elevated temperature. The yield strength of the alloy exceeds 420 MPa at 900 °C, and value of which is still above 200 MPa when the test temperature reaches 1000 °C. Finally, the compressive yield strength model at room temperature is constructed. The prediction error of the model ranges from − 7.9% to − 12.4%, expressing fair performance.
{"title":"Microstructure and Mechanical Properties of the Ti62Nb12Mo12Ta12W2 Refractory High Entropy Alloy Prepared through Spark Plasma Sintering","authors":"Zirui Chen, Liyuan Wang, Jiayu Zhao, Guanhua Cui, Zhuo Gao, Zhiyuan Fan, Xiaohui Shi, Junwei Qiao","doi":"10.1007/s40195-024-01718-9","DOIUrl":"10.1007/s40195-024-01718-9","url":null,"abstract":"<div><p>A refractory high entropy alloy Ti<sub>62</sub>Nb<sub>12</sub>Mo<sub>12</sub>Ta<sub>12</sub>W<sub>2</sub> was prepared by mechanical alloying and spark plasma sintering. The microstructure and mechanical properties of the Ti<sub>62</sub>Nb<sub>12</sub>Mo<sub>12</sub>Ta<sub>12</sub>W<sub>2</sub> alloy were analyzed. The experimental results show that the microstructure of the alloy is composed of two BCC phases, an FCC precipitated phase, and the precipitated phase which is a mixture of TiC, TiN and TiO. The alloy exhibits good room temperature compressive properties. The plasticity of the sample sintered at 1550 °C can reach 10.8%, and for the sample sintered at 1600 °C, the yield strength can be up to 2032 MPa, in the meantime the plasticity is 9.4%. The alloy also shows high strength at elevated temperature. The yield strength of the alloy exceeds 420 MPa at 900 °C, and value of which is still above 200 MPa when the test temperature reaches 1000 °C. Finally, the compressive yield strength model at room temperature is constructed. The prediction error of the model ranges from − 7.9% to − 12.4%, expressing fair performance.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 8","pages":"1387 - 1398"},"PeriodicalIF":2.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415236","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 : 2024-05-31DOI: 10.1007/s40195-024-01709-w
Guanjiu Wu, Yichao Xie, Yuan Li, Qing Wang, Chenfeng Fan, Wenfeng Wang, Lu Zhang, Shumin Han
La–Mg–Ni-based hydrogen storage alloys have excellent hydrogen storage properties. This work reports the hydrogen storage performance of a series of A2B7-type La0.96Mg0.04Ni3.34Al0.13 alloy and La0.96-xYxMg0.04Ni3.47–0.6xAl0.6x (x = 0, 0.22, 0.33, 0.44) alloys, and explores the effect of Y and Al element combined substitution on the microstructure and hydrogen storage performance of A2B7-type La–Mg–Ni-based alloys. The alloys are composed of Ce2Ni7 phase and LaNi5 phase. With the increase of x, the cell volume of Ce2Ni7 phase decreases, while that of LaNi5 phase increases, indicating that Y atom mainly enters Ce2Ni7 phase and Al atom mainly enters LaNi5 phase. An appropriate amount of co-substitution increases the hydrogen storage capacity and reduces the hydrogen absorption/desorption plateau pressure hysteresis of the alloy. When x = 0.44, the hydrogen storage capacity of the alloy is 1.449 wt%, and the hysteresis coefficient is 0.302. The cell volume of Ce2Ni7 phase and LaNi5 phase expands to different degrees after 20 absorption/desorption cycles. With the increase of x, the volume expansion rate decreases, and the cycle capacity retention rate also gradually decreases. This is related to the amorphization of Ce2Ni7 phase. When x = 0.22, the capacity retention rate of the alloy is 91.4%.
La-Mg-Ni 基储氢合金具有优异的储氢性能。本研究报告了一系列 A2B7 型 La0.96Mg0.04Ni3.34Al0.13 合金和 La0.96-xYxMg0.04Ni3.47-0.6xAl0.6x (x = 0, 0.22, 0.33, 0.44) 合金的储氢性能,并探讨了 Y 和 Al 元素联合取代对 A2B7 型 La-Mg-Ni 基合金微观结构和储氢性能的影响。合金由 Ce2Ni7 相和 LaNi5 相组成。随着 x 的增加,Ce2Ni7 相的晶胞体积减小,而 LaNi5 相的晶胞体积增大,这表明 Y 原子主要进入 Ce2Ni7 相,而 Al 原子主要进入 LaNi5 相。适量的共取代增加了合金的储氢能力,降低了合金的吸氢/解吸高原压力滞后。当 x = 0.44 时,合金的储氢能力为 1.449 wt%,滞后系数为 0.302。经过 20 次吸收/解吸循环后,Ce2Ni7 相和 LaNi5 相的电池体积会有不同程度的膨胀。随着 x 的增加,体积膨胀率降低,循环容量保持率也逐渐降低。这与 Ce2Ni7 相的非晶化有关。当 x = 0.22 时,合金的容量保持率为 91.4%。
{"title":"Effect of Y, Al Co-Doping on Hydrogen Storage Properties of La–Mg–Ni-Based Alloys","authors":"Guanjiu Wu, Yichao Xie, Yuan Li, Qing Wang, Chenfeng Fan, Wenfeng Wang, Lu Zhang, Shumin Han","doi":"10.1007/s40195-024-01709-w","DOIUrl":"10.1007/s40195-024-01709-w","url":null,"abstract":"<div><p>La–Mg–Ni-based hydrogen storage alloys have excellent hydrogen storage properties. This work reports the hydrogen storage performance of a series of A<sub>2</sub>B<sub>7</sub>-type La<sub>0.96</sub>Mg<sub>0.04</sub>Ni<sub>3.34</sub>Al<sub>0.13</sub> alloy and La<sub>0.96-<i>x</i></sub>Y<sub><i>x</i></sub>Mg<sub>0.04</sub>Ni<sub>3.47–0.6<i>x</i></sub>Al<sub>0.6<i>x</i></sub> (<i>x</i> = 0, 0.22, 0.33, 0.44) alloys, and explores the effect of Y and Al element combined substitution on the microstructure and hydrogen storage performance of A<sub>2</sub>B<sub>7</sub>-type La–Mg–Ni-based alloys. The alloys are composed of Ce<sub>2</sub>Ni<sub>7</sub> phase and LaNi<sub>5</sub> phase. With the increase of <i>x</i>, the cell volume of Ce<sub>2</sub>Ni<sub>7</sub> phase decreases, while that of LaNi<sub>5</sub> phase increases, indicating that Y atom mainly enters Ce<sub>2</sub>Ni<sub>7</sub> phase and Al atom mainly enters LaNi<sub>5</sub> phase. An appropriate amount of co-substitution increases the hydrogen storage capacity and reduces the hydrogen absorption/desorption plateau pressure hysteresis of the alloy. When <i>x</i> = 0.44, the hydrogen storage capacity of the alloy is 1.449 wt%, and the hysteresis coefficient is 0.302. The cell volume of Ce<sub>2</sub>Ni<sub>7</sub> phase and LaNi<sub>5</sub> phase expands to different degrees after 20 absorption/desorption cycles. With the increase of <i>x</i>, the volume expansion rate decreases, and the cycle capacity retention rate also gradually decreases. This is related to the amorphization of Ce<sub>2</sub>Ni<sub>7</sub> phase. When <i>x</i> = 0.22, the capacity retention rate of the alloy is 91.4%.</p></div>","PeriodicalId":457,"journal":{"name":"Acta Metallurgica Sinica-English Letters","volume":"37 8","pages":"1399 - 1410"},"PeriodicalIF":2.9,"publicationDate":"2024-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142415230","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}