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 Ruihong Wang;Shengyu Jiang;Bao'an Chen;Zhixiang Zhu

作者机构：School of Materials Science and EngineeringXi'an University of TechnologyXi'an710048PR China State Key Laboratory of Advanced Power Transmission TechnologyGlobal Energy Interconnection Research Institute Co.Ltd.Beijing102209PR China 

出 版 物：《Journal of Materials Science & Technology》 (材料科学技术（英文版）)

年 卷 期：2020年第54卷第22期

页      面：78-84页

核心收录：

学科分类：08[工学] 0817[工学-化学工程与技术] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0703[理学-化学] 0802[工学-机械工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

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

主　　题：Al-Mg-Si-Sc alloy Al3Sc dispersoids Precipitation Size effect Hardness and conductivity 

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.