Y对ZA84镁合金显微组织和力学性能的影响  

Effects of Y on Microstructure and Mechanical Properties of ZA84 Magnesium Alloy

作　　者：许春香[1] 张学勇[1] 杨家灼[1] 

机构地区：[1]太原理工大学材料学院

出　　处：《新技术新工艺》2010年第8期94-98,共5页New Technology & New Process

基　　金：山西省自然科学基金资助项目(2007011067)

摘　　要：利用金相显微镜、电子万能试验机、扫描电镜和X射线等手段,研究了添加Y含量（0%～1.5%）对铸态Mg-8Zn-4Al-0.3Mn合金的显微组织和力学性能的影响。结果表明,随稀土元素Y的加入,合金的铸态组织的变化趋势为先细化后粗化。适量稀土元素Y（0.5%）的加入使ZA84镁合金的组织明显细化,网状的τ-Mg32（Al,Zn）49相变成颗粒状。当Y含量〉0.5%时,网状的τ-Mg32（Al,Zn）49相重新出现,组织又逐渐粗化。合金的硬度值随Y含量的增加先升高后降低,且Y含量1.0%时达到最大值。稀土Y的加入,以固溶形式和形成强化相2种方式极大改善了合金的力学性能。当Y含量为0.5%时,获得最佳室温和高温力学性能,其常温抗拉强度和高温抗拉强度分别为206MPa和182MPa。与基体合金相比,分别提高了15%、14.4%。Effect of Y addition（0～1.5%）on the microstructure and mechanical properties of as-cast Mg-8Zn-4Al-0.3Mn alloy has been studied by metallographic microscope,electronic universal materials testing machine,scanning electron microscopy（SEM）and X-ray diffraction（XRD）.The results indicated that the microstructure of alloy is refined first and then becomes coarse with putting Y in.Proper amount of Y addition（0.5%）makes microstructure of ZA84alloy become refined andτ-Mg32（Al,Zn）49 network become particles.When Y addition is more than 0.5%,net-likeτ-Mg32（Al,Zn）49phase appears again and the microstruc-ture gradually becomes coarse.The hardness shows increasing firstly and then decreasing trend with increasing Y content.When Y content is 1.0%,the hardness reaches the peak.Y addition greatly improves the mechanical properties by ways of solid solution strengthening and second phase strengthening.When Y addition is 0.5%,both room temperature and elevated temperature tensile strengths reach the maximum,which are 206Mpa and 182Mpa.The room temperature and elevated temperature tensile strengths are 15%、14.4%higher than that of mother alloy respectively

关 键 词：Y ZA84镁合金 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]