Cu对铸造Mg-4Zn-0.5Ca镁合金的组织及性能影响  

Effects of Cu element on microstructure and properties of Mg-4Zn-0. 5Ca alloy

作　　者：毛萍莉[1] 杨金龙[1] 刘正[1] 秦佳明 周野[1] 

机构地区：[1]沈阳工业大学材料科学与工程学院,辽宁沈阳110870

出　　处：《材料热处理学报》2016年第7期95-99,共5页Transactions of Materials and Heat Treatment

基　　金：辽宁省创新团队项目(LT2013004);辽宁省科技攻关项目(2013201018)

摘　　要：以Mg-4Zn-0.5Ca合金为研究对象,研究了Cu对Mg-4Zn-0.5Ca合金组织及力学性能的影响。结果表明,Cu可以通过与Zn原子结合形成Mg-Zn-Cu三元相在α-Mg基体边界富集,阻碍基体长大,使Mg-4Zn-0.5Ca合金铸态组织得到细化,合金主要由α-Mg,Ca2Mg6Zn3,Mg Zn Cu相组成。Cu元素可以提高Mg-4Zn-0.5Ca合金的硬度及抗拉强度,当Cu含量为1%时,铸态Mg-4Zn-0.5Ca-1Cu合金的抗拉强度和屈服强度分别为149 MPa、102 MPa,相对于基本合金提高了14.6%和29.1%,合金硬度提高18.8%至63 HV。过量的Cu会使合金中的析出相呈连续的网状分布在晶界上,导致力学性能的下降。The effects of Cu on microstructure and mechanical properties of the Mg-4Zn-0.5Ca alloy were investigated. The results show that Cu and Zn can form Mg-Zn-Cu ternary phase and gather in the boundary of Mg to inhibit the grain growth, and result in the fine as- cast Mg-4Zn-0.5Ca alloy microstructure. The euteetie structures of the new alloy are consist of α-Mg,Ca2MgaZn3 and MgZnCu phases. Element Cu in the alloy can increase the hardness and tensile strength of as-cast Mg-4Zn-0. 5Ca alloy. When Cu content is 1 percent, the ultimate tensile strength and yield strength of as-cast Mg-4Zn-0.5Ca-lCu alloy are 149 MPa and 102 MPa, respectively, the increment compared with that of as-cast Mg-4Zn-0.5 Ca alloy are 14.6% and 29.1% , respectively. The hardness of as-east Mg-4Zn-0.5 Ca-1 Cu alloy increase to 63 HV, the increment is 18.8%. The precipitated phases of the Mg-4Zn-0.5Ca-2Cu are distributed in form of continuous net- like structure in the grain boundary, resulting in decreased mechanical properties.

关 键 词：CU 镁合金 铸态组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]