材料科学技术(英文版)2022，Vol.103Issue(8) ：186-196.

Microstructure and strengthening mechanism of hot-extruded ultralight Mg-Li-Al-Sn alloys with high strength

Gang Zhou Yan Yang Hanzhu Zhang Faping Hu Xueping Zhang Chen Wen Weidong Xie Bin Jiang Xiaodong Peng Fusheng Pan
材料科学技术(英文版)2022，Vol.103Issue(8) ：186-196.
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Microstructure and strengthening mechanism of hot-extruded ultralight Mg-Li-Al-Sn alloys with high strength

Gang Zhou 1Yan Yang 2Hanzhu Zhang 1Faping Hu 1Xueping Zhang 1Chen Wen 3Weidong Xie 1Bin Jiang 4Xiaodong Peng 5Fusheng Pan1
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作者信息

  • 1. International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
  • 2. International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China;State Key Laboratory of Mechanical Transmissions,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
  • 3. Beijing Spacecrafts,Beijing 100090,China
  • 4. International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;State Key Laboratory of Mechanical Transmissions,College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
  • 5. International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China
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Abstract

Duplex-structured Mg-7Li-2Al-1.5Sn alloys with high strength were fabricated and their strengthening mechanism was investigated.The Mg-7Li-2Al-1.5Sn alloys were prepared by casting and extruded at the temperature of 533 K with an extrusion ratio of 25:1.The microstructure and mechanical properties of Mg-7Li-2Al-1.5Sn alloys were systematically investigated by OM,XRD,SEM,TEM,and tensile tests.The re-sults show that Mg-7Li-2Al-1.5Sn alloys are mainly composed of α-Mg,β-Li,LiMgAl2,Mg2Sn and Li2MgSn phases.The yield strength(YS),ultimate tensile strength(UTS)and elongation(EL)of the extruded al-loy at room temperature reach 250 MPa,324 MPa and 11.9％,respectively.A lot of Sn-rich precipitates(Mg2Sn and Li2MgSn)are precipitated during extrusion with an average size of～14 nm,which is ben-eficial to the grain refinement.Dynamic recrystallization occurs during hot deformation and the nano-precipitates effectively refine the dynamic recrystallized(DRXed)grains.Besides,the residual dislocations existed in DRXed and un-DRXed grains result in the dislocation strengthening in the extruded alloy.Mg-7Li-2Al-1.5Sn alloys possess excellent high-temperature mechanical properties with the YS,UTS and EL of 200 MPa,237 MPa and 26.7％at 423 K,respectively.Sn-rich precipitates with good thermal stability can effectively prevent grain growth,which is good for the improvement of the high-temperature perfor-mance of Mg-Li-Al-Sn alloy.

Key words

Ultralight Mg-Li alloy/Microstructure/Mechanical properties/Precipitation/Strengthening mechanism

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基金项目

financial support from the Chongqing Research Program of Basic Research and Frontier Technology(cstc2019jcyj-msxmX0306)

National Key Research and Development Program of China(2016YFB0700403)

National Key Research and Development Program of China(2016YFB0301100)

fundamental Research funds for Central Universities(Project2021CDJJMRH-001)

fundamental Research funds for Central Universities(2020CDJDPT001)

111 Project(ProjectB16007)

出版年

2022
材料科学技术(英文版)
中国金属学会 中国材料研究学会 中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCDSCI
影响因子：0.657
ISSN：1005-0302
参考文献量61
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