材料科学技术(英文版)2021，Vol.66Issue(7) ：64-73.

Mechanical properties and deformation mechanisms of a novel fine-grained Mg-Gd-Y-Ag-Zr-Ce alloy with high strength-ductility synergy

Xiaofei Cui Wei Fu Daqing Fang Guangli Bi Zijun Ren Shengwu Guo Suzhi Li Xiangdong Ding Jun Sun
材料科学技术(英文版)2021，Vol.66Issue(7) ：64-73.
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Mechanical properties and deformation mechanisms of a novel fine-grained Mg-Gd-Y-Ag-Zr-Ce alloy with high strength-ductility synergy

Xiaofei Cui 1Wei Fu 2Daqing Fang 2Guangli Bi 3Zijun Ren 2Shengwu Guo 2Suzhi Li 2Xiangdong Ding 2Jun Sun2
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作者信息

  • 1. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China;School of Materials Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024, China
  • 2. State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, 710049, China
  • 3. State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China
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Abstract

Grain boundary precipitation and segregation play an important role in determining mechanical properties of Mg alloys.In the present work,we studied work focuses on the strengthening and deformation mechanism of coarse-grained (CG) and fine-grained (FG) Mg-Gd-Y-Ag-Zr-Ce alloy.The CG alloy is strengthened by means of age-strengthening with the formation of both basal plate γ" and prismatic plate β'precipitates in the grain interior.While the strengthening of FC alloy is completed by intergranular alloying segregation and intragranular precipitates γ" and β'.The segregation of alloying elements at the grain boundary and formation of sub-micron particles can stabilize the grain boundary and suppress the intergranular deformation.Consequently,dislocations could be trapped near γ" and β'precipitates in the grain interior.Unlike CG alloys,the FG alloys exhibit a heterogeneous transition from elastic to plastic deformation via the Lüders plateau.The rapid gliding dislocation multiplications and fine-grained size are necessary and sufficient conditions for the Lüders strains.Our work provides the insights on the evolution of fine-grained microstructure and helps for the design of Mg alloys with good mechanical properties.

Key words

Magnesium alloys/Solute segregation/Lüders-like deformation/Precipitates

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基金项目

This work was financially supported by the National Natural Science Foundation of China(51901174)

This work was financially supported by the National Natural Science Foundation of China(51961021)

China Postdoctoral Science Foundation(2020M673383)

Innovation Capability Support Program of Shaanxi(2018PT-28)

Innovation Capability Support Program of Shaanxi(2017KTPT-04)

Guangli Bi thanks the support from the Open Project of State Key Laboratory for Mechanical Behavior of Materials(20192102)

出版年

2021
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
被引量1
参考文献量58
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