Effects of RE on Microstructures and Mechanical Properties of Hot-Extruded AZ31 Magnesium Alloy
来源期刊：JOURNAL OF RARE EARTHS2004年第4期
论文作者：陈维平 张大童 李元元 张卫文 刘英
Key words：metal materials; AZ31 magnesium alloy; rare earth element; microstructure; mechanical properties;
Abstract: Effects of rare earth (RE) additions on microstructure and mechanical properties of the wrought AZ31 magnesium alloy were investigated. The results show that, by adding 0.3%, 0.6% and 1.0% RE elements, the as-cast microstructure can be refined, and the as-cast alloys′ elongation and tensile strength can be improved. After extrusion, the alloy with 0.3% and 0.6% RE additions obtain a finer microstructure and the best mechanical properties, but the alloy with 1.0% RE addition has the coarse Al-RE compound particles in grain boundaries which decreased elongation and tensile properties. Usually, Rare earth (RE) elements were used to improve the creep properties of aluminium-containing magnesium pressure die cast alloys at elevated temperatures. In this paper, it is also found that the high temperature strength of extruded materials can be increased by RE elements additions.
陈维平1，张大童1，李元元1，张卫文1，刘英1
(1.Key Laboratory for Advanced Metallic Materials Processing and Forming of Guangdong,South China University of Technology,Guangzhou 510640,China)
Abstract:Effects of rare earth (RE) additions on microstructure and mechanical properties of the wrought AZ31 magnesium alloy were investigated. The results show that, by adding 0.3%, 0.6% and 1.0% RE elements, the as-cast microstructure can be refined, and the as-cast alloys′ elongation and tensile strength can be improved. After extrusion, the alloy with 0.3% and 0.6% RE additions obtain a finer microstructure and the best mechanical properties, but the alloy with 1.0% RE addition has the coarse Al-RE compound particles in grain boundaries which decreased elongation and tensile properties. Usually, Rare earth (RE) elements were used to improve the creep properties of aluminium-containing magnesium pressure die cast alloys at elevated temperatures. In this paper, it is also found that the high temperature strength of extruded materials can be increased by RE elements additions.
Key words:metal materials; AZ31 magnesium alloy; rare earth element; microstructure; mechanical properties;
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