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Relating Initial Texture to Deformation Behavior During Cold Rolling and Static Recrystallization Upon Subsequent Annealing of an Extruded we43 alloy

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Acta Metallurgica Sinica(English Letters) 2022年第11期35卷 1793-1811页

作者： Qinghang Wang Haowei Zhai Hongbo Xia Lintao Liu Junjie He Dabiao Xia Hong Yang Bin Jiang School of Mechanical Engineering Yangzhou UniversityYangzhou 225127China National Engineering Research Center for Magnesium alloys Chongqing UniversityChongqing 400044China School of Materials and Energy Yunnan UniversityKunming 650599China The Center of New Energy Materials and Manufacturing Jihua LaboratoryFoshan 528000China

Deformation behaviors during cold rolling and static recrystallization behaviors upon subsequent annealing of an extruded we43 alloys with different initial textures were investigated in this study.Three types of differently textured we43 initial alloys were labeled as samplesⅠ,ⅡandⅢ.The results showed that multiple twinning modes and basal slip dominated the deformation of samples during cold rolling.Cold-rolled sampleⅠactivated the larger number of double twins with high strain energy,accompanied by the more uniform strain distribution,than cold-rolled samplesⅡandⅢ.During subsequent annealing,recrystallized grains preferentially occurred in double twins,twin-twin intersections and grain boundaries,thereby making cold-rolled sampleⅠhave the more rapid recrystallization rate.Similar recrystallization textures formed in three types of cold-rolled samples at the recrystallization nucleation stage,and they never largely changed with the annealing time due to the uniform grain growth induced by the solute drag and the precipitation pinning at grain boundaries.After full recrystallization,the grain growth was controlled by the solute drag,instead of precipitates which were re-dissolved into the matrix.Finally,the nucleation and growth kinetics of static recrystallization were calculated,and the effects of initial texture on activation energies of recrystallization nucleation and growth were discussed.

关键词： we43 alloy Texture Cold rolling Annealing Static recrystallization

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Improvement of microstructure,mechanical properties,and corrosion resistance of we43 alloy by squeeze casting

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China Foundry 2022年第5期19卷 419-426页

作者： Jian-cong Bian Bao-yi Yu Jian-fei Hao Hui-wen Zhu Hui-shu Wu Bin Chen wei-rong Li Yan-fang Li Li Zheng Run-xia Li School of Materials Science and Engineering Shenyang University of TechnologyShenyang 110870China School of Materials Science and Engineering Dongguan University of TechnologyDongguan 523808GuangdongChina Dongguan Eontec Co. Ltd.Dongguan 523808GuangdongChina

The we43 magnesium alloy was prepared by squeeze casting,and the influence of squeeze casting parameters on mechanical properties and corrosion resistance was studied and compared with gravity casting.The gravity cast we43 alloy shows uneven grain size distribution,and some grains even greater than 90μm.While,the grain size of the squeeze cast we43 alloy is mainly distributed in 20-50μm.The Mg12Nd2Y phase morphology changes from large lamellar to strips after squeeze casting,whereas Mg_(24)Y_(5) phase exhibits no obvious change.The yield strength,tensile strength,and elongation of the gravity cast we43 alloy are 127 MPa,157 MPa,and 6%,respectively,and 145 MPa,193 MPa,and 9.1%for squeeze cast alloy.For the squeeze cast we43 alloy,the average corrosion rate is 0.6056 mm·year^(-1) according to immersion test results,and according to electrochemical measurements,the corrosion current density is 78.13μA·cm^(-2),which is better than that of the gravity cast we43 alloy.Compared with gravity casting,the grains and second phase of the we43 alloy by squeeze casting are refined,and the mechanical properties and corrosion resistance are improved.This may expand the applications of the we43 alloy.

关键词： we43 alloy squeeze casting microstructure mechanical properties corrosion resistance

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The effect of pore size on the mechanical properties, biodegradation and osteogenic effects of additively manufactured magnesium scaffolds after high temperature oxidation: An in vitro and in vivo study

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Bioactive Materials 2023年第10期28卷 537-548页

作者： Chaoxin Wang Jinge Liu Shuyuan Min Yu Liu Bingchuan Liu Yuanyu Hu Zhengguang Wang Fengbiao Mao Caimei Wang Xiaolin Ma Peng wen Yufeng Zheng Yun Tian Department of Orthopedics Peking University Third HospitalBeijing100191China Engineering Research Center of Bone and Joint Precision Medicine Ministry of EducationBeijing100191China Department of Mechanical Engineering Tsinghua UniversityBeijing100084China Institute of Medicine Innovation and Research Peking University Third HospitalBeijing100191China Beijing AKEC Medical Co. Ltd.Beijing102200China School of Materials Science and Engineering Peking UniversityBeijing100871China

The effects of pore size in additively manufactured biodegradable porous magnesium on the mechanical properties and biodegradation of the scaffolds as well as new bone formation have rarely been reported. In this work, we found that high temperature oxidation improves the corrosion resistance of magnesium scaffold. And the effects of pore size on the mechanical characteristics and biodegradation of scaffolds, as well as new bone formation, were investigated using magnesium scaffolds with three different pore sizes, namely, 500, 800, and 1400 μm (P500, P800, and P1400). we discovered that the mechanical characteristics of the P500 group were much better than those of the other two groups. In vitro and in vivo investigations showed that we43 magnesium alloy scaffolds supported the survival of mesenchymal stem cells and did not cause any local toxicity. Due to their larger specific surface area, the scaffolds in the P500 group released more magnesium ions within reasonable range and improved the osteogenic differentiation of bone mesenchymal stem cells compared with the other two scaffolds. In a rabbit femoral condyle defect model, the P500 group demonstrated unique performance in promoting new bone formation, indicating its great potential for use in bone defect regeneration therapy.

关键词： Pore size Additive manufacturing we43 alloy Magnesium alloy

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Creep Behavior and Microstructure Evolution of Sand–Cast Mg–4Y–2.3Nd–1Gd–0.6Zr alloy Crept at 523–573 K

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Journal of Materials Science & Technology 2017年第1期33卷 79-89页

作者： Y.H.Kang H.Yan R.S.Chen The Group of Magnesium alloys and Their Applications Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China University of the Chinese Academy of Sciences Beijing 100049China

High temperature tensile-creep behavior of Mg-4Y-2.3Nd-IGd-O.6Zr （wt%, we43（T6）） alloy at 523- 573 K was investigated. The creep stress exponent is equal to 4.6, suggesting the underlying dislocation creep mechanism. The activation energy is （199 _＋ 23） kJ/mol, which is higher than that for self- diffusion in Mg and is believed to be associated with precipitates coarsening or cross slip. The creep mechanism is further suggested to be dislocation climb at 523 K, while a cross slip at 573 K is possible. The metastable 13＇ and ~]1 phases in the we43（T6） alloy were relatively thermal stable at 523 K and could be effective to hinder the dislocation climb, which contributed to its excellent creep resistance. However, at 573 K it readily transforms into equilibrium/3e phase and coarsens within two hours, thereby causing a decrease of creep resistance. In addition, precipitate free zones approximately normal to applied stress direction （directional PFZs） developed during the creep deformation, especially at 573 K. Those zones became preferential sites to nucleate, extend and connect microcracks and cavities, which lead to the intergranular creep fracture. Improving the thermal stability of precipitates or introducing thermally stable fine plate-shaped precipitates on the basal planes of Mg matrix could enhance the high temperature creep resistance.

关键词： we43 alloy Creep PFZs Precipitate Fracture

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