Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys

查看全文 作　　者：Qiuju [1,2]Zheng;Lili [1]Zhang;Hongxiang [1]Jiang;Jiuzhou [1,2]Zhao;Jie [1,2]He

机构地区：[1]Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,PR China;[2]School of Materials Science and Engineering,University of Science and Technology of China,Shenyang 110016,PR China

出　　处：《Journal of Materials Science & Technology》索引2020年第47卷第12期,共10页

基　　金：supported by the National Natural Science Foundation of China [grant numbers 51771210,51901231];the Science and technology project of the headquarters of SGCC [grant number5500-201924129A-0-0-00];Chinese Academy of Sciences Strategic Priority Program on Space Science [grant number XDA15013800];China’s Manned Space Station Project [grant number TGJZ800-2-RW024]。 摘　　要：The rare earth influence on the as-cast micro structures and mechanical properties of aluminum alloys attracted great attentions in the last decades.But up to date no reports can be found on the effect of microalloying element La(La addition is below 0.1 wt.%) on the solidification of hypoeutectic Al-Si alloys.This study carried out solidification experiments with Al-6 Si alloys micro-alloyed by element La.The α-Al grain refinement,the eutectic Si modification and the tensile properties improvement caused by microalloying element La were investigated.The effect mechanisms of La were discussed.It is demonstrated that the addition of La as low as 100 ppm can deprave the more effective heterogeneous nucleation conditions for the eutectic Si caused by the impurity P.The addition of 0.06 wt.% La is sufficient to achieve an ideal α-Al grain refinement,eutectic Si modification and ductility improvement of the alloys.LaAlSi phase forms in the Al-Si alloy with the additive amount of La higher than 0.06 wt.%.It has a tetragonal structure.Micro-alloying element La refines the α-Al grains by working as a surfactant and modifies the eutectic Si by promoting the formation of the significant multiple Si twins. 关键词：Aluminum alloy Micro-alloying element La MICROSTRUCTURE Tensile properties MECHANISMS

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Effect mechanisms of micro-alloying element La on microstructure and mechanical properties of hypoeutectic Al-Si alloys

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