(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 研究AZ31镁合金挤压薄板的显微组织、织构及室温下板面内各不同方向的力学性能。织构分析表明，挤压薄板主要有{0002}<1`010>和{1`010}<1`120> 2种织构组分。拉伸测试结果显示，沿挤压方向屈服强度最高，达到200.4 MPa，这是由于这种取向基面滑移和{1`012}锥面孪生均不能开动，发生织构强化的结果；与挤压方向呈45˚方向伸长率最高达19.0%，这是由于具有{1`010}<1`120>织构组分晶粒的基面滑移开动；与挤压方向呈90˚方向屈服强度最低仅为挤压方向相应值的一半左右，这是由于具有{1`010}<1`120>织构组分晶粒发生了{1`012}锥面孪生。
关键字: AZ31镁合金；挤压；织构；力学各向异性
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The microstructure, texture and mechanical properties in different planar directions of the AZ31 magnesium alloy extruded sheets were investigated. There are two main texture components, that is {0002}<1`010> and {1`010}<1`120>, from texture analysis. The results from the tensile tests at room temperature are as follows: the basal slip as well as the {1`012} pyramidal twinning is inhibited in extrusion direction under the tensile loads, which results in the highest yield strength (200.4 MPa); for the specimen in the direction 45˚ to the extrusion direction, the basal slip is activated in the grains with {1`010}<1`120> texture component, which results in the highest elongation (19.0%); the yield strength in the direction 90˚ to the extrusion direction is only half of its counterpart along the extrusion direction because the {1`012} pyramidal twinning is operated in the grains with {1`010}<1`120> texture component.
Key words: AZ31 magnesium alloy; extrusion; texture; mechanical anisotropy
