AZ31B镁合金铸轧板材组织及力学性能研究  

Microstructures and Mechanical Properties of Roll-casting AZ31B Magnesium Alloy Sheet

作　　者：李金柱[1,2] 农登[1] 戚文军[1] 郑开宏[1] 赵明纯[2] 

机构地区：[1]广东省工业技术研究院(广州有色金属研究院)金属成型与加工技术研究所,广东广州510650 [2]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《铸造技术》2014年第2期277-280,共4页Foundry Technology

基　　金：广东省重大科技专项资助项目(2011A080403005)

摘　　要：运用光学显微镜、扫描电镜及万能拉伸试验机等检测分析手段对AZ31B镁合金铸轧板材组织和力学性能进行了研究。结果表明,该合金由等轴枝晶和变形枝晶组成,共晶体组织主要由β-Mg17Al12和少量β-Mg17(AlZn)12相组成,晶内弥散分布着细小圆状Al8Mn5析出相。AZ31B镁合金铸轧板材在轧向(RD)和横向(TD)的抗拉强度分别达到250MPa和200 MPa,伸长率分别为5.5%和6.0%,断裂类型分别为脆性解理断裂和准解理断裂。The microstructures and mechanical properties of roll-casting AZ31B magnesium alloy sheet were investigated through microstructure observation and tensile testing at room temperature. The results show that the microstructures are consisted of equiaxed and deformed dendritic crystal. The eutectic compounds are mainly consisted of β-Mg17 Al12 and a small amount of β-Mg17（AlZn）12, and the small rounded second phases Al8 Mn5 appeared in the intracrystalline. Furthermore, in RD and TD directions of the roll-casting alloy sheet, the tensile strengths（UTS） are 250 MPa and 200 MPa, the elongation are 5.5% and 6.0%, and the fracture modes are brittle cleavage fracture and quasi-cleavage fracture, respectively.

关 键 词：AZ31B镁合金 铸轧板 显微组织 力学性能 

分 类 号：TG339[金属学及工艺—金属压力加工]