首页|Effect of gradient microstructure on the bendability of AZ31 alloy sheet

Effect of gradient microstructure on the bendability of AZ31 alloy sheet

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Extensive researches have elucidated the pronounced benefits of gradient microstructures for the me-chanical properties of metallic materials.However,the ramifications of gradient microstructures on formability,particularly regarding their effects on bendability,remain inadequately understood.In this work,the effects of gradient microstructure on the bendability of AZ31 Mg alloy sheet are systematically investigated by comparing the microstructure evolution and strain distribution in the sheets with uni-form microstructure(grain size=12.8 μm and 91.3 μm)and gradient microstructure(grain size=11.5-75.4 μm).The results show that the bendability of the sheet with gradient microstructure is significantly improved when the fine grains(FGs)are placed at the outer side(TBE-FG sample)and the bendability is increased by 93.1％compared to the sample with fine and uniform microstructure(CE-FG sample).With coarse grains(CGs)placed at the inner side,the strain at the compressive region of the TBE-FG sample is higher than its counterparts,while the tensile strain at the extended region is lowest among the four samples.Quasi-in-situ bending experiments reveal that the CGs at the inner side of the TBE-FG sample undergo more twinning.Moreover,the increment of residual dislocation density at the outer side of the TBE-FG sample is lower than those of other samples,which extends the bending potential.This work provides a novel perspective to improve the bendability of the Mg alloy sheet.

Gradient microstructureBendabilityStrain distributionQuasi-in-situ bending

Lintao Liu、Jieyu Li、Shengwen Bai、Bin Jiang、Chao He、Jianxin Zhou、Guangsheng Huang、Dingfei Zhang、Fusheng Pan

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National Engineering Research Center for Magnesium Alloys,Chongqing University,Chongqing 400044,China

College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

Chongqing Academy of Science and Technology,Chongqing 401123,China

National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaIndependent Research Project of State Key Laboratory of Mechanical Transmissions

2021YFB370100052101124U21A2048SKLMT-ZZKT-2022M12

2024

10.1016/j.jmst.2023.08.036

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)

CSTPCD
影响因子：0.657
ISSN：1005-0302
年,卷(期)：2024.178(11)
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