RE对铸造Al-6Zn-2.5Mg-1.8Cu合金热裂倾向性的影响  

Effects of RE Addition on the Hot Tearing Susceptibility of the Cast Al-6Zn-2.5Mg-1.8Cu Alloys

作　　者：马士平 闫成鑫 于宝义[1] 郑黎[1] 李润霞 Ma Shiping;Yan Chengxin;Yu Baoyi;Zheng Li;Li Runxia(School of Material Science and Engineering,Shenyang University of Technology;School of Mechanical Engineering,Dongguan University of Technology)

机构地区：[1]沈阳工业大学材料科学与工程学院 [2]东莞理工学院机械工程学院

出　　处：《特种铸造及有色合金》2019年第3期326-330,共5页Special Casting & Nonferrous Alloys

基　　金：辽宁省教育厅重点资助项目(2017244112)

摘　　要：在铸造Al-6Zn-2.5Mg-1.8Cu合金中分别加入0、0.05%、0.1%和0.15%的RE,研究了RE对合金的热裂倾向、微观组织和力学性能的影响。结果表明,RE的加入可细化晶粒尺寸,提高合金的力学性能,降低合金的热裂倾向。在加入范围内,RE含量为0.1%时,热裂倾向性最低,晶粒尺寸最小,力学性能最佳,合金的抗拉强度和伸长率分别为180MPa和3%。Hot tearing susceptibility,microstructures and mechanical properties of cast Al-6Zn-2.5Mg-1.8Cu alloy with RE contents Such as 0,0.05%,0.1% and 0.15% were investigated.The results reveal that RE addition in alloy can refine grain size and improve the mechanical properties as well as decreasing the hot tearing susceptibility of the alloy.The alloy with 0.1%RE has the lowest hot tearing susceptibility,the smallest grain size and the desirable mechanical properties,where tensile strength and elongation of the alloy reach 180 MPa and 3%,respectively.

关 键 词：Al-6Zn-2.5Mg-1.8Cu合金 RE 热裂倾向性 显微组织 力学性能 

分 类 号：TG146.21[一般工业技术—材料科学与工程]