Effect of Ca and Y additions on oxidation behavior of AZ91 alloy at elevated temperatures

被引：76
|
作者：
Cheng Su-ling [1 ]
Yang Gen-cang [1 ]
Fan Jian-feng [1 ]
Li You-jie [1 ]
Zhou Yao-he [1 ]
机构：
[1] NW Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2009年 / 19卷 / 02期
基金：
中国国家自然科学基金;
关键词：
AZ91; alloy; calcium; yttrium; oxidation resistance; oxidation kinetics; RARE-EARTH ADDITIONS; MAGNESIUM ALLOYS; MECHANICAL-PROPERTIES; SURFACE OXIDATION; IGNITION; MICROSTRUCTURE; BERYLLIUM;
D O I：
10.1016/S1003-6326(08)60268-X
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
In order to develop the ignition-proof magnesium alloy, the effect of alloying elements, Ca and Y, on the oxidation behavior of AZ91 magnesium alloy at elevated temperatures was investigated. The ignition-proof performance, oxide products and oxidation kinetics of Ca- and Y-containing AZ91 alloys were studied. The results indicate that the proper addition of Ca can increase the ignition point of AZ91 alloy greatly. However, the oxide film of Ca-bearing AZ91 alloy formed at elevated temperature is thick and brittle, which is prone to crack in melting and cooling process. In addition, the oxide film of AZ91-xCa alloy is incompact and cannot inhibit the diffusion of reaction particles. The oxide film of AZ91-xCa alloy turns to thin and plastic one after Y is added, and the density of the oxide Film increases greatly due to the formation of composite oxide film composed of MgO, CaO and Y(2)O(3).
引用
收藏
页码：299 / 304
页数：6
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