稀土元素La对2024铝合金铸态组织及性能的影响

Effect of Rare Earth Element La on As-cast Microstructure and Properties of 2024 Aluminum Alloy

通过显微组织观察及力学性能的分析,研究不同含量稀土元素La对2024铝合金铸态组织及力学性能的影响。结果表明:随着稀土元素La含量的增加,2024铝合金铸态组织逐渐细化,当稀土元素La含量为0.3%时,晶粒细化效果最佳;继续提高La含量,晶粒则发生粗化。当稀土元素La含量为0.2%时,力学性能最佳。

The effect of different content of rare earth element La on the as-cast microstructure and mechanical properties of 2024 aluminum alloy was studied by microstructure observation and mechanical properties analysis.The results show that with the increases of rare earth La content,the as-cast microstructure of 2024 aluminum alloy is gradually refined.When the content of rare earth element La is 0.3%,the grain refinement effect is the best.The crystal grain coarsenes with further the increase of La content.When the content of rare earth element La is 0.2%,the mechanical properties are the best.