Mg-10Er-2Zn-0.6Zr合金的组织及力学性能  

Microstructure and Mechanical Properties of Mg-10Er-2Zn-0.6Zr Alloy

作　　者：袁柯[1] 尹健[1] 卢春辉[1] 

机构地区：[1]南昌航空大学航空制造工程学院

出　　处：《特种铸造及有色合金》2016年第2期216-219,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51101084);江西省自然科学基金资助项目(20151BAB216002)

摘　　要：采用光学显微镜、X射线衍射仪(XRD)、扫描电镜(SEM)和力学试验等研究了Mg-10Er-2Zn-0.6Zr合金的组织和力学性能。结果表明,铸态Mg-10Er-2Zn-0.6Zr合金主要由树枝状α-Mg基体以及分布于枝晶间的长周期结构相和Mg_3(Er,Zn)相组成;合金经过500℃×20h固溶后,铸态合金中LPSO相和Mg_3(Er,Zn)相消失,而在晶界处生成WMg_3Er_2Zn_3相;随后炉冷至400℃,α-Mg晶内析出呈平行排列且贯穿晶粒的条纹状LPSO相结构。拉伸条件下,固溶态合金具有最佳的力学性能,其屈服强度、抗拉强度和伸长率分别为117 MPa、227 MPa、17.9%。与拉伸性能相比,压缩条件下合金表现出更优的力学性能。The microstructure and mechanical properties of the Mg-10Er-2Zn-0.6Zr alloy were investigated by means of optical microscope（OM）,X-ray diffraction（XRD）,scanning electron microscope（SEM）and mechanical tests.The results reveal that as-cast Mg-10Er-2Zn-0.6Zr alloy is mainly composed ofα-Mg dendrite and interdendritic long period stacking ordered（LPSO）phases and Mg3（Er,Zn）phases.After solution treatment at 500℃for 20 h,both LPSO phase and Mg3（Er,Zn）disappear and in turn a new W（Mg_3Er_2Zn_3）phase can be observed along the grain boundaries.During the following cooling in the furnace to 400 ℃,the LPSO lamella structure is parallel to each other precipitated within and throughout theα-Mg grains.The solution-treated alloy exhibits the desirable mechanical properties,where yield strength,tensile strength and elongation reach 117 MPa,227MPa and 17.9%,respectively.However,the compressive properties are superior to those of tensile ones.

关 键 词：镁合金 Mg-10Er-2Zn-0.6Zr LPSO相 

分 类 号：TG146.22[一般工业技术—材料科学与工程]