Effects of Si content and Ca modification on microstructure and thermal expansion property of Mg-Si alloys

被引：21

作者：

Guo, Tian ^{[1
]}

Wu, Shusen ^{[1
]}

Zhou, Xiong ^{[1
]}

Lu, Shulin ^{[1
]}

Xia, Lanqing ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China

来源：

MATERIALS CHEMISTRY AND PHYSICS | 2020年 / 253卷

基金：

中国国家自然科学基金;

关键词：

CTE; Mg-Si alloys; Microstructure; Ca addition; MECHANICAL-PROPERTIES; PRIMARY MG2SI; COMPOSITES; MAGNESIUM; BEHAVIOR; PARTICLES;

D O I：

10.1016/j.matchemphys.2020.123260

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The effect of Si content on the coefficient of thermal expansion (CTE) of Mg-xSi (x = 1, 2, 3, 4 wt%) alloys and the influence of Ca addition of Mg-4Si-yCa (y = 0.2, 0.4, 0.6, 0.8, 1.0 wt%) alloys have been studied. The results show that with the increase of Si content, the CTE of Mg-Si alloys decrease sharply, which is decreased by 30.8%, from 26 x 10(-6)/K of pure Mg to 17.98 x 10(-6)/K of Mg-4Si alloy at room temperature. When appropriate amount of Ca is added, the morphology of Mg2Si in Mg-4Si alloy can be effectively modified, but excessive addition of Ca about 1 wt% can result in over-modification. When 0.2 wt% Ca is added, the CTE of Mg-4Si alloy is increased compared with no Ca addition. After this, along with the increase of Ca content, the CTE of the alloy is decreased.

引用

页数：7

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