Preparation and theoretic study of semi-solid Al2Y/AZ91 magnesium matrix composites slurry by ultrasonic vibration

被引：14

作者：

Huang Wenxian ^{[1
,2
,3
]}

Yan Hong ^{[1
,2
]}

机构：

[1] Nanchang Univ, Sch Mech Elect Engn, Dept Mat Proc Engn, Nanchang 330031, Peoples R China

[2] Key Lab Light Alloy Preparat & Proc Nanchang City, Nanchang 330031, Peoples R China

[3] Jinggangshan Univ, Sch Architectural Engn, Dept Civil Engn, Jian 343009, Jiangxi, Peoples R China

来源：

JOURNAL OF RARE EARTHS | 2014年 / 32卷 / 06期

基金：

中国国家自然科学基金;

关键词：

ultrasonic vibration; magnesium matrix composites; semi-solid slurry; microstructure; rare earths; MICROSTRUCTURE;

D O I：

10.1016/S1002-0721(14)60110-1

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Semi-solid Al2Y/AZ91 magnesium matrix composites slurry was prepared by ultrasonic vibration, effect of ultrasonic vibration temperature and time on microstructure of semi-solid slurry was investigated. The results showed that with the ultrasonic vibration temperature decreasing the solid volume fraction of semi-solid slurry increased. The best ultrasonic vibration temperature was 600 degrees C. With the increase of ultrasonic vibration time, the average grain diameter of primary a-Mg particles decreased firstly, then increased, the average shape factor increased gradually and decreased slightly after 90 s, and a few rosette dendrites were observed after 120 s. The best semi-solid slurry with average grain diameter of 75 mu m and shape factor of 0.7 were gained after the melt was treated by ultrasonic vibration for about 60 s at near liquidus temperature (600 degrees C). At last, the microstructure evolution mechanism of semi-solid magnesium matrix composites slurry was analyzed by the theories of thermodynamics and kinetics.

引用

页码：573 / 579

页数：7

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