Hot extrusion of SiCp/AZ91 Mg matrix composites

被引：39

作者：

Wang Xiao-jun ^{[1
]}

Hu Xiao-shi ^{[1
]}

Nie Kai-bo ^{[1
]}

Wu Kun ^{[1
]}

Zheng Ming-yi ^{[1
]}

机构：

[1] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 08期

基金：

中国国家自然科学基金;

关键词：

extrusion; Mg matrix composites; SiCp; AZ91 magnesium alloy; volume fraction; MECHANICAL-PROPERTIES; DYNAMIC RECRYSTALLIZATION; MICROSTRUCTURE; PARAMETERS; BEHAVIOR; SIZE;

D O I：

10.1016/S1003-6326(11)61407-6

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

SiC particles reinforced AZ91 Mg matrix composites (SiCp/AZ91) with SiC volume fractions of 5%, 10% and 15% were fabricated by stir casting. After T4 treatment, these composites were extruded at 350 degrees C with an extrusion ratio of 12:1. In the as-cast composite, particles segregated at a microscopic scale within the intergranular regions. Hot extrusion almost eliminated this particle aggregation and improved the particle distribution of the composites. In addition, extrusion refined the grains of matrix. The results show that hot extrusion significantly improves the mechanical properties of the composites. In the as-extruded composite, with the increase of SiCp contents, the grain size of the extruded composites decreases, the strength and elastic modulus increase but the elongation decreases.

引用

页码：1912 / 1917

页数：6

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