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 

机构地区：[1]Institute of Advanced Forming, Nanchang University

出　　处：《China Foundry》2015年第4期269-276,共8页中国铸造（英文版）

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

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.The influence of Sm(Samarium) content on microstructure and mechanical properties of recycled die-cast YL112 aluminum alloys was investigated.The results show that many small Sm-rich particles form in the recycled die-cast YL112 alloys with Sm addition.At the same time,the secondary dendrite arm spacing in the YL112 alloys modified with Sm is smaller than that of the unmodified alloy.The eutectic Si of recycled diecast YL112-xSm alloys transforms from coarse acicular morphology to fine fibres,Mechanical properties of the investigated recycled die-cast YL112 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.

关 键 词：rare earth aluminum alloy die casting SAMARIUM microstructure eutectic Si nano particles mechanical properties 

分 类 号：TG146.2[一般工业技术—材料科学与工程]