Effects of calcium and rare earth elements on microstructure and creep properties of AZ91 alloy in as cast and semisolid processed conditions

被引：7
作者：
Nami, B.
Shabestari, S. G. [1 ]
Miresmaeili, S. M. [2 ]
Razavi, H.
Mirdamadi, Sh [1 ]
机构：
[1] Iran Univ Sci & Technol, Sch Met & Mat Engn, Ctr Excellence Adv Mat & Proc, Tehran, Iran
[2] Shahid Rajaee Teacher Training Univ, Dept Mech Engn, Tehran, Iran
来源：
INTERNATIONAL JOURNAL OF CAST METALS RESEARCH | 2011年 / 24卷 / 01期
关键词：
AZ91 magnesium alloy; Rare earth elements; Calcium; Microstructure; Semisolid; Creep; MG-AL ALLOYS; MECHANICAL-PROPERTIES; MAGNESIUM ALLOY; BEHAVIOR; TEMPERATURE; ADDITIONS; LIQUID;
D O I：
10.1179/1743133610Y.0000000001
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
The effect of Ca and rare earth (RE) elements on the microstructure and creep properties of AZ91 magnesium alloy was studied in as cast and semisolid processed conditions. The results showed that in as cast condition of AZ91 alloy grain refinement takes place and the amount of beta-Mg17Al12 intermetallic phase decreases due to addition of Ca and RE elements. Also, two new Al11RE3 and Al2Ca intermetallic compounds are formed in the Ca and RE containing alloy. In the semisolid microstructure, the size and shape factor of the primary globular alpha-Mg phase and the size of the alpha-Mg grains formed during secondary solidification decrease by adding Ca and RE elements into AZ91 alloy. It was also shown that the creep properties of AZ91 alloy is greatly improved by adding Ca and RE elements in the as cast and semisolid processed specimens.
引用
收藏
页码：45 / 52
页数：8
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