Size effect in the Al3Sc dispersoid-mediated precipitation and mechanical/electrical properties of Al-Mg-Si-Sc alloys  

作　　者：Ruihong Wang Shengyu Jiang Bao'an Chen Zhixiang Zhu 

机构地区：[1]School of Materials Science and Engineering,Xi'an University of Technology,Xi'an,710048,PR China [2]State Key Laboratory of Advanced Power Transmission Technology,Global Energy Interconnection Research Institute Co.,Ltd.,Beijing,102209,PR China

出　　处：《Journal of Materials Science & Technology》2020年第22期78-84,共7页材料科学技术（英文版）

基　　金：the financial support of the project from the National Natural Science Foundation of China (No. 51771147)。

摘　　要：A significant size effect is found in the Al3 Sc dispersoid-mediated precipitation in an Al-Mg-Si-Sc alloy.When the Al3 Sc dispersoid size smaller than about 40 nm,β " precipitates nucleate directly on the coherent dispersoids and grow by sacrificing the latter.While the dispersoid size greater than^40 nm,Q' and U2 phases are additionally produced that nucleate on the dislocations induced by the semi-/incoherent dispersoids.Mechanical and electrical properties are highly sensitive to the Al3 Sc dispersoid-tuned precipitation.The co-precipitation of β",Q' and U2 phases leads to an obvious improvement in hardness and simultaneously in electrical conductivity.

关 键 词：Al-Mg-Si-Sc alloy Al3Sc dispersoids PRECIPITATION Size effect Hardness and conductivity 

分 类 号：TG146.21[一般工业技术—材料科学与工程]