Microstructural evolution of AZ91 magnesium alloy during extrusion and heat treatment

被引：51

作者：

Li Jing-yuan ^{[1
]}

Xie Jian-xin ^{[1
]}

Jin Jun-bing ^{[2
]}

Wang Zhi-xiang ^{[3
]}

机构：

[1] Beijing Univ Sci & Technol, Sch Mat Sci & Engn, Beijing 100083, Peoples R China

[2] China Aviat Planning & Construct Dev Co Ltd, Beijing 100120, Peoples R China

[3] Jiangxi Univ Sci & Technol, Sch Mat Sci & Engn, Ganzhou 341000, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 05期

关键词：

AZ91; alloy; microstructural evolution; Mg17Al12; phase; heat treatment; extrusion; MECHANICAL-PROPERTIES; DEFORMATION; BEHAVIOR;

D O I：

10.1016/S1003-6326(11)61279-X

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Microstructural evolution of AZ91 magnesium alloy was investigated during homogenizing annealing treatment, hot extrusion and ageing treatment, respectively. The results exhibited that both the divorced eutectic beta-Mg17Al12 and the precipitated beta-Mg17Al12 phases appeared in the as-cast alloy. The beta-Mg17Al12 phase dissolved into alpha-Mg matrix mostly and the structure kept fine after the optimized homogenization treatment at 380 degrees C for 15 h. Dynamic recrystallization and consequent grain refinement occurred during extrusion. The banded beta-Mg17Al12 precipitates paralleled to the extrusion direction were observed after ageing treatment. The banded precipitation should be attributed to the solidification segregation which was elongated during the subsequent extrusion. Furthermore, the effects of temperature, holding time of homogenization and ageing treatment, and extrusion processing parameters on the microstructural evolution of AZ91 alloy were also discussed in details according to the experimental results.

引用

页码：1028 / 1034

页数：7

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