Microstructure and mechanical properties of pure Mg after spiral equal-channel extrusion

被引：2

作者：

Li, Jinghui ^{[1
]}

Li, Fuguo ^{[2
]}

Liang, Shan ^{[3
]}

Huang, Zhenyi ^{[1
]}

Zhang, Mingya ^{[1
]}

机构：

[1] Anhui Univ Technol, Sch Met Engn, Maanshan 243002, Peoples R China

[2] Northwestern Polytech Univ, Sch Mat Sci & Engn, State Key Lab Solidificat Proc, Xian, Peoples R China

[3] Anhui Univ Technol, Sch Innovat Educ, Maanshan, Peoples R China

来源：

MATERIALS SCIENCE AND TECHNOLOGY | 2021年 / 37卷 / 04期

基金：

中国国家自然科学基金;

关键词：

Pure magnesium; severe plastic deformation; microstructure evolution; mechanical properties; recrystallisation; SEVERE PLASTIC-DEFORMATION; MAGNESIUM ALLOY; SHEAR LOCALIZATION; FLOW BEHAVIOR; TEMPERATURE; EVOLUTION;

D O I：

10.1080/02670836.2021.1901366

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

One of the severe plastic deformation techniques, elliptical cross-sectioned spiral equal-channel extrusion (ECSEE) was successfully applied to the pure Mg processed at 200 degrees C and the microstructure and properties were studied. The observation shows that the grains are refined to 2.1 mu m after 2-pass deformation. The proportion of high-angle grain boundary increases to 49.4% after 6-pass. The minimum time of grain boundary rotating 30 degrees is about 0.847 ms, and the maximum time is 2.34 ms. TEM observation illustrates the grain morphology evolves from shear bands to recrystallised grains. There was a significant increase in strength to similar to 180 MPa but a decrease in the ductility (similar to 12%) of pure Mg after 6-pass ECSEE. The refinement mechanism is mainly divided into mechanical and physical refinement.

引用

页码：384 / 394

页数：11

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