稀土元素铈对镁合金AZ91D显微组织和力学性能的影响  

Effects of Cerium on Microstructure and Mechanical Property of AZ91D Magnesium Alloy

作　　者：周坐东[1] 

机构地区：[1]湖南有色金属研究院,湖南长沙410015

出　　处：《湖南有色金属》2010年第2期34-36,46,共4页Hunan Nonferrous Metals

摘　　要：利用光学显微镜、X射线衍射和扫描电镜等分析研究含铈镁合金AZ91D(0.25%Ce、0.7%Ce、0.95%Ce)的显微组织,并对其力学性能进行了测试,同时与不含铈镁合金AZ91D进行了比较。结果表明,加入一定量Ce后的镁合金AZ91D形成杆状化合物Al4Ce,被推移到生长界面,阻碍枝晶的自由生长,从而细化合金显微组织;Ce能提高镁合金AZ91D抗拉强度和硬度,而对其屈服强度和延伸率影响不大;加入0.7%Ce的AZ91D镁合金晶粒细化效果和综合力学性能比较理想。The microstructure and phase composition of AZ91D magnesium alloys with the different additions of Ce were studied by optical Microscope（OM）, X-ray diffraction（XRD）and scanning electron microscope（ SEM ）, the mechanical properties at room- temperature were tested, and the microstrucutre and mechanical properties were compared between the alloys with and without the addition of Ce. The results show that a rod-like compound Al4Ce is formed in AZ91D alloys after adding a certain quantity of Ce contents, which is pushed onto the growth interface and hinders the growth of the dendrite freely. Thus Ce can refine microstuctures of AZ91D alloy at ambient temperature, while it has little influences on their yield strength and elongation. AZ91D alloy containing 0.7 % Ce has good refinement effect and relatively mechanical properties.

关 键 词：铈 AZ91D镁合金 显微组织 力学性能 

分 类 号：TG146.4[一般工业技术—材料科学与工程]