Hot Extrusion Effect on the Microstructure and Mechanical Properties of a Mg-Y-Nd-Zr Alloy

被引：18

作者：

Sheng, L. Y. ^{[1
]}

Du, B. N. ^{[1
]}

Wang, B. J. ^{[1
]}

Xu, D. K. ^{[2
]}

Lai, C. ^{[1
]}

Gao, Y. ^{[3
]}

Xi, T. F. ^{[1
]}

机构：

[1] Peking Univ, Shenzhen Inst, Shenzhen, Peoples R China

[2] Chinese Acad Sci, Inst Met Res, Key Lab Nucl Mat & Safety Assessment, Shenyang, Liaoning, Peoples R China

[3] Zunyi Med Coll, Dept Stomatol, Longgang Dist Cent Hosp, Shenzhen, Guangdong, Peoples R China

来源：

STRENGTH OF MATERIALS | 2018年 / 50卷 / 01期

关键词：

Mg-Y-Nd-Zr alloy; hot extrusion; mechanical properties; TEM; microstructure; HIGH-TEMPERATURE SYNTHESIS; EUTECTIC ALLOY; MAGNESIUM ALLOY; TEXTURE; DUCTILITY;

D O I：

10.1007/s11223-018-9958-9

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Mg-Zn-Y-Nd alloy was prepared by casting and hot extrusion. The microstructure and mechanical properties of OM, SEM, XRD, TEM, and tensile tests were investigated with casting and hot extruded alloys. The results demonstrate that in a casting Mg-Y-Nd-Zr alloy, the alpha-Mg matrix is separated into the cell structure by a discontinuously distributed coarse Mg24Y5/alpha-Mg eutectic structure and fine Mg12Nd particles. TEM analysis shows that the Mg12Nd and Mg24Y5 phases have the orientation of , and and , respectively. The hot extrusion separates the Mg24Y5/alpha-Mg eutectic structure into fragments and aligns fragmentary Mg24Y5 particles along the extrusion direction. The interaction of hot extrusion and strengthening particles refines the alpha-Mg matrix greatly. Moreover, large strains result in the stacking faults of the matrix. As compared to the casting alloy, the hot-extruded one exhibits high yield strength, ultimate tensile strength, and elongation, which should be ascribed to the grain fineness, optimum distribution of strengthening particles and multiple substructures.

引用

页码：184 / 192

页数：9

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