(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 研究AZ31鎂合金擠壓薄板的顯微組織、織構(gòu)及室溫下板面內(nèi)各不同方向的力學(xué)性能。織構(gòu)分析表明，擠壓薄板主要有{0002}<1`010>和{1`010}<1`120> 2種織構(gòu)組分。拉伸測試結(jié)果顯示，沿擠壓方向屈服強(qiáng)度最高，達(dá)到200.4 MPa，這是由于這種取向基面滑移和{1`012}錐面孿生均不能開動，發(fā)生織構(gòu)強(qiáng)化的結(jié)果；與擠壓方向呈45˚方向伸長率最高達(dá)19.0%，這是由于具有{1`010}<1`120>織構(gòu)組分晶粒的基面滑移開動；與擠壓方向呈90˚方向屈服強(qiáng)度最低僅為擠壓方向相應(yīng)值的一半左右，這是由于具有{1`010}<1`120>織構(gòu)組分晶粒發(fā)生了{(lán)1`012}錐面孿生。
關(guān)鍵字: AZ31鎂合金；擠壓；織構(gòu)；力學(xué)各向異性
（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
