Influence of La and RE on the underside shrinkage of ZA27 alloy

被引：0

作者：

Chen, YG ^{[1
]}

Tu, MJ ^{[1
]}

Shen, BL ^{[1
]}

Gao, SJ ^{[1
]}

机构：

[1] Sichuan Univ, Dept Met Mat, Chengdu 610065, Peoples R China

来源：

JOURNAL OF RARE EARTHS | 1999年 / 17卷 / 02期

关键词：

rare earths; lanthanum; zinc base alloy; underside shrinkage;

D O I：

暂无

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The effect of pure La and mischmetal( RE) on underside shrinkage of ZA27 alloy with cooling rate of 3.2 OC min(-1) was investigated. The results show that the volumes of the underside shrinkage and the total shrinkage(underside shrinkage plus internal shrinkage) of the alloy decrease as the content of La or RE increases. When the contents of La and RE exceed 0.3% similar to 0.4%(mass fraction) respectively, the underside shrinkage is eliminated and the internal shrinkage moves upwards gradually. The mechanism that the underside shrinkage is eliminated is the falling of La and RE compounds and their accumulation on the bottom of the ZA27 allay sample. Since La and RE can not effectively prevent a phases(Al base solid solution) in the alloy from rising, the internal shrinkage is still close to the bottom of the ZA27 sample.

引用

页码：126 / 130

页数：5