挤压工艺对ZM21镁合金显微组织和性能的影响  

Effects of Extrusion Processes on Microstructure and Mechanical Properties of ZM21 Magnesium Alloy

作　　者：彭建[1] 宋成猛[1] 刘虹[1] 樊世波[1] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044

出　　处：《热加工工艺》2009年第11期36-39,共4页Hot Working Technology

基　　金：国家重点基础研究发展规划(973)(No.2007CB613704);"十一五"国家支撑计划(No.2007BAG06B04);国家自然科学基金(No.50725413)

摘　　要：通过显微组织观察,力学性能测试,研究了ZM21镁合金在400℃时不同挤压比和挤压速度对显微组织和性能的影响,并优化了挤压参数。结果表明:当挤压速率为0.1m/s时,优化的挤压比为70.9;当挤压比为121.3时最佳的挤压速率为0.3m/s;用屈服强度和晶粒尺寸之间的关系计算出了该合金的hall-patch公式系数,得到Ky为393.4MPa·μm1/2。The experiments of micro-structure and mechanical properties test were carried out, and the effects of the extrusion ratio and the extrusion speed on the micro-structure and mechanical properties of ZM21 magnesium alloy extruded at 400℃ were analyzed, and the extrusion parameter was optimized. The results shows when the extrusion speed is 0.1m/s, the best extrusion ratio is 70.9. When the extrusion ratio is 121.3, the best extrusion speed is 0.3m/s. The Hall-Petch constant （ Ky=393.4 MPa·μm^1/2） was calculated by the Hall-Petch equation for the alloy.

关 键 词：ZM21镁合金 挤压比 显微组织 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]