Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 30    No. 7    July 2020

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Microstructure and thermophysical properties of Mg-2Zn-xCu alloys
Wan-peng ZHANG1,2,3, Ming-long MA1,2,3, Jia-wei YUAN1,2,3, Guo-liang SHI1,2,3, Yong-jun LI1,2,3, Xing-gang LI1,2,3, Kui ZHANG1,2,3

1. State Key Laboratory of Nonferrous Metals and Processes, GRINM Group Co., Ltd., Beijing 100088, China;
2. GRIMAT Engineering Institute Co., Ltd., Beijing 101407, China;
3. General Research Institute for Nonferrous Metals, Beijing 100088, China

Abstract: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.

 

Key words: Mg-Zn-Cu alloy; heat treatment; electrical conductivity; thermal conductivity; first-principles calculations

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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