Effects of RE on Microstructures and Mechanical Properties of Hot-Extruded AZ31 Magnesium Alloy |
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作者姓名: | 刘英 陈维平 张卫文 张大童 李元元 |
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作者单位: | KeyLaboratoryforAdvancedMetallicMaterialsProcessingandFormingofGuangdong,SouthChinaUniversityofTechnology,Guangzhou510640,China |
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摘 要: | 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 A1-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.
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关 键 词: | RE 微观结构 机械性能 稀土元素 AZ31镁合金 热挤压工艺 |
Effects of RE on Microstructures and Mechanical Properties of Hot-Extruded AZ31 Magnesium Alloy |
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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. |
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Keywords: | metal materials AZ31 magnesium alloy rare earth element microstructure mechanical properties |
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