Deformation-induced dissolution of long-period stacking ordered structures and its re-precipitation in a Mg-Gd-Zn-Mn alloy

被引：16

作者：

Su, Ning ^{[1
,2
,3
]}

Deng, Qingchen ^{[1
,2
]}

Wu, Yujuan ^{[1
,2
,4
]}

Peng, Liming ^{[1
,2
,4
]}

Yang, Kun ^{[3
]}

Chen, Qiang ^{[3
]}

机构：

[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China

[2] Shanghai Jiao Tong Univ, Key State Lab Met Matrix Composites, Sch Mat Sci & Engn, Shanghai 200240, Peoples R China

[3] Kyushu Univ, Fatigue & Fracture Mat Lab, Fac Engn, Fukuoka, Japan

[4] Shanghai Jiao Tong Univ, Mat Genome Initiat Ctr, Shanghai 200240, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2021年 / 171卷

基金：

中国国家自然科学基金;

关键词：

Magnesium alloys; Long period stacking ordered structure; Hot deformation; Dissolution; Electron microscopy; MECHANICAL-PROPERTIES; HOT DEFORMATION; MAGNESIUM ALLOY; LPSO STRUCTURES; Y-ALLOY; BEHAVIOR; MICROSTRUCTURE; SEGREGATION; GROWTH; COLD;

D O I：

10.1016/j.matchar.2020.110756

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

In this paper, the dissolution, refinement and re-precipitation of long period stacking order structure and solute-segregated stacking faults (LPSO structure/SFs) in an Mg-Gd-Zn-Mn alloy fabricated by hot extruding were studied. The results demonstrate that the refinement of LPSO structure/SFs was dominated by the misalignment mechanism and re-dissolution mechanism. Dislocation slips on the LPSO structure/SFs, as well as the rapid diffusion of solute atoms was responsible for the re-dissolution of LPSO structure/SFs. As the LPSO structure/SFs dissolved, a region with supersaturated solute atoms was formed and resulting in re-precipitation of SFs in continuous dynamically recrystallized grains. Finally, the evolution model of LPSO structure/SFs during continuous dynamic recrystallization was proposed.

引用

页数：9

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