压缩对AZ31镁合金微观组织和力学性能的影响  

Effects of Compression on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy

作　　者：崔凯旋 石晶晶 杨容 李宝生 汪炳叔[1] 

机构地区：[1]福州大学材料科学与工程学院,福建福州350108

出　　处：《热加工工艺》2017年第17期29-32,共4页Hot Working Technology

基　　金：中国博士后科学基金资助项目(2016M590591);福州大学贵重仪器设备开放测试基金资助项目(2016T024)

摘　　要：对AZ31镁合金在室温下沿轧制板材不同方向进行多向压缩,研究了不同加载路径下AZ31镁合金的力学性能和微观组织演变。结果表明,沿不同方向3道次压缩时,样品表现出不同的力学行为,沿TD(横向)-RD(轧向)-ND(法向)路径压缩时,材料屈服强度随压缩道次增加而增大;沿ND-RD-TD路径压缩时,材料的屈服强度随压缩道次增加先减小后增大。每次压缩后,(0001)基面织构都转到压缩轴附近。TD样品的主要塑性变形机制为孪生,而ND样品的主要塑性变形机制为滑移。多向压缩产生的孪生可以分割细化晶粒,使镁合金强度提高。The AZ31 magnesium alloy was subjected to multi-direction compression along different directions of the rolled plate at room temperature. The mechanical properties and microstructure evolution of AZ31 magnesium alloy under different loading paths were studied. The results show that during three passes compression along different directions, samples exhibit different mechanical properties. With compression along TD （transverse direction）-RD （rolling direction）-ND （normal direction） path, the yield strength of the material increases with the increase of the compression pass; with compression along ND-RD-TD path, the yield strength of the material decreases firstly and then increases with the increase of the compression pass. The （0001） basal plane texture rotates to compression direction after each compression. The main deformation mechanism of TD samples is twinning, while the main plastic deformation mechanism of ND samples is slipping. The twins produced by multi-direction compression can refinegrains and improve the strength of magnesium alloy.

关 键 词：压缩 AZ31镁合金 孪生 织构 

分 类 号：TG319[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]