Remelting of SSM ingot prepared by the near-liquidus casting of AZ91D magnesium alloy

被引：0

作者：

Le, QC ^{[1
]}

Zhang, XJ ^{[1
]}

Cui, JZ ^{[1
]}

Lu, GM ^{[1
]}

Ou, P ^{[1
]}

机构：

[1] Northeastern Univ, Minist Educ, Key Lab Electromagnet Proc Mat, Shenyang 110004, Peoples R China

来源：

ACTA METALLURGICA SINICA | 2002年 / 38卷 / 12期

关键词：

AZ91D magnesium alloy; near-liquidus casting; partial remelting; microstructure;

D O I：

暂无

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The microstructure evolution of AZ91D magnesium alloy SSM (semi-solid metal) ingots obtained by near-liquidus casting was investigated under altering partial remelting temperature and holding time. The results indicate that good thixotropic microstructure would be obtained by controlling remelting temperature and holding time suitably, and the spheroidizing process is accelerated and improved due to refining and rosettizing of ingot microstructure at higher cooling rate during casting. For the ingots cast at near-liquidus and stewing for 30 min, optimizing thixotropic microstructure could be obtained at 575-580 degreesC for 15-30 min as cast in water-cooled-iron mould, and 580 degreesC for 15-30 min in graphite mould. The process of microstructure evolution during remelting includes spheroidization preparation, grains refining and spheroidizing, and grains growth. The diffusion of solute and vacancy, and the boundary tension play a predominant role respectively at the primary stage, and the middle-final stage.

引用

页码：1266 / 1272

页数：7