Influence of samarium content on microstructure and mechanical properties of recycled die-cast YL112 aluminum alloys

作     者：Zhi Hu Yan Hong Yuan-sheng Rao Hong-xu Qiu Xian-ming Ruan 

作者机构：Institute of Advanced Forming Nanchang University 

出 版 物：《China Foundry》 (中国铸造（英文版）)

年 卷 期：2015年第12卷第4期

页      面：269-276页

核心收录：

学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）] 

基　　金：supported by the National Natural Science Foundation of China(51405216,51165032) Jiangxi Province Education Commission Foundation(GJJ14200) 

主　　题：rare earth aluminum alloy die casting samarium microstructure eutectic Si nano particles mechanical properties 

摘      要：The influence of Sm （Samarium） content on microstructure and mechanical properties of recycled die-cast YLl12 aluminum alloys was investigated. The results show that many small Sm-rich particles form in the recycled die-cast YLl12 alloys with Sm addition. At the same time, the secondary dendrite arm spacing in the YLl12 alloys modified with Sm is smaller than that of the unmodified alloy. The eutectic Si of recycled die- cast YL112-xSm alloys transforms from coarse acicular morphology to fine fibres. Mechanical properties of the investigated recycled die-cast YLl12 aluminum alloys are enhanced with Sm addition, and a maximal ultimate tensile strength value （276 MPa） and elongation （3.76%） are achieved at a Sm content of 0.6wt.%. Due to the modification of eutectic Si by Sm, numerous tearing ridges and tiny dimples on the fractures of tensile samples are observed.