Microstructure and thermophysical properties of Mg-2Zn-xCu alloys

被引：20

作者：

Zhang, Wan-peng ^{[1
,2
,3
]}

Ma, Ming-long ^{[1
,2
,3
]}

Yuan, Jia-wei ^{[1
,2
,3
]}

Shi, Guo-lian ^{[1
,2
,3
]}

Li, Yong-jun ^{[1
,2
,3
]}

Li, Xing-gang ^{[1
,2
,3
]}

Zhang, Kui ^{[1
,2
,3
]}

机构：

[1] GRINM Grp Co Ltd, State Key Lab Nonferrous Met & Proc, Beijing 100088, Peoples R China

[2] GRIMAT Engn Inst Co Ltd, Beijing 101407, Peoples R China

[3] Gen Res Inst Nonferrous Met, Beijing 100088, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2020年 / 30卷 / 07期

基金：

中国国家自然科学基金;

关键词：

Mg-Zn-Cu alloy; heat treatment; electrical conductivity; thermal conductivity; first-principles calculations; THERMAL-CONDUCTIVITY; MECHANICAL-PROPERTIES; MAGNESIUM ALLOYS; AS-CAST; DIFFUSIVITY; BEHAVIOR; PRECIPITATION; STRENGTH;

D O I：

10.1016/S1003-6326(20)65340-7

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The microstructure and thermophysical properties of Mg-2Zn-xCu alloys (x=0.5, 1.0 and 1.5, at.%) were investigated through microstructural and thermophysical characterization, heat treatment, and first-principles calculations. It was found that the addition of Cu had influence on the microstructure and thermophysical properties of the alloy. As the Cu content increased, the content of the MgCuZn phase increased in the as-cast alloys along with the electrical and thermal conductivities. After solution treatment, the eutectic structure partially decomposed and Zn atoms dissolved into the matrix, leading to the decrease in both the electrical and thermal conductivities of the alloy. During the early stages of the aging treatment, solute atoms precipitated from the matrix, thus increasing the electrical conductivity of the alloy. After aging for 24 h, the thermal conductivity of Mg-2Zn-1.5Cu alloy reached the maximum of 147.1 W/(m.K). The thermostable MgCuZn phases were responsible for increasing the electrical and thermal conductivities. Smaller amounts of Zn atoms dissolved in the matrix resulted in smaller lattice distortion and higher conductivities. The first-principles calculations findings also proved that the MgCuZn phases had very high conductance.

引用

页码：1803 / 1815

页数：13

共 32 条

[1]

[Anonymous], 2020, MET SOC CHINA, V30, P1803

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