首页|Effect of initial grain size on the recrystallization behavior and recrystallization texture of a Mg-3Gd alloy

Effect of initial grain size on the recrystallization behavior and recrystallization texture of a Mg-3Gd alloy

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The effect of initial grain size on the recrystallization and recrystallization texture of a rolled Mg-3Gd(wt.％)alloy is studied in detail.The results show that the deformation microstructure of an initially coarse-grained(CG)sample has a larger twinned area and a higher density of twin boundaries than a fine-grained(FG)sample.After annealing,the CG sample recrystallizes preferentially in the twinned area,whereas the FG sample adopts the higher density grain boundaries as the nucleation sites.Fur-thermore,weak recrystallization texture components appear from the grain nucleation stage,regardless of the initial grain size,and are preserved after complete recrystallization due to uniform grain growth.The majority of recrystallization texture is deviated 20°-45° away from normal direction(ND),accounting for more than 50％.Especially,the recrystallization texture of the FG sample is a"Rare Earth texture",in contrast to the widely reported texture modification unrelated to grain boundary nucleation.Only a scattered basal texture is observed in the CG sample,which also differs from the reported"Rare Earth texture"originating from shear band nucleation in dilute Mg-Gd alloys.Finally,based on the Johnson-Mehl-Avrami-Kolmogorov(JMAK)model,the recrystallization kinetics are calculated,and it is found that the initial grain size mainly affects the nucleation rate,and has limited effect on the grain growth rate.

Mg-3GdGrain sizeMicrostructure evolutionRecrystallization textureRecrystallization kinetics

Fang Han、Xuan Luo、Knut Marthinsen、Guilin Wu、Ziyong Hou、Xiaoxu Huang

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International Joint Laboratory for Light Alloys(MOE),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

Key Laboratory for Light-weight Materials,Nanjing Tech University,Nanjing 210009,China

Department of Materials Science and Engineering,Norwegian University of Science and Technology,Trondheim 7491,Norway

Beijing Advanced Innovation Center for Materials Genome Engineering,University of Science and Technology Beijing,Beijing 100083,China

Shenyang National Laboratory for Materials Science,Chongqing University,Chongqing 400044,China

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National Key Research and Development Program of ChinaNational Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central Universitiesthe"111"ProjectMinistry of Education and the State Administration of Foreign Experts Affairs of China,Graduate Student Research Innovation Research Council of NorwayCenter for Research based Innovation SFI PhysMet

2021YFB370210152130107520710382023CDJXY-018B16007CYB21007309724309584

2024

10.1016/j.jmst.2023.11.044

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)：2024.188(21)
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