【作者】 何运斌； 潘清林； 覃银江； 李文斌； 梁文杰； 刘晓艳； Yu Lung CHIU；

【Author】 He Yunbin~1,Pan Qinglin~1,Qin Yinjiang~1,Li Wenbin~1,Liang Wenjie~1,Chiu Yulung~2 (1.Department of Materials Science and Engineering,Central South University,Changsha,410083,China; 2.Department of Chemical and Materials Engineering,University of Auckland,Auckland,New Zealand)

【机构】 中南大学材料科学与工程学院； Department of Chemical and Materials Engineering,University of Auckland；

【摘要】 利用等通道挤压(ECAP)制备出了细晶ZK60合金,通过金相组织观察,硬度测试和透射电镜(TEM)研究了不同挤压温度和挤压道次对合金组织与性能的影响。结果表明:ZK60镁合金在210～240℃温度范围内进行等通道挤压能获得较好的晶粒细化效果;在240℃进行ECAP挤压,随着挤压道次的增加,合金晶粒得到明显的细化,经过4道次挤压后,合金晶粒可细化到2.8μm;但是超过4道次后,合金的细化效果减慢;合金ECAP后的硬度值随挤压温度的升高而降低,随挤压道次的增加而升高。更多还原

【Abstract】 The Equal Channel Angular Pressing technology was employed to fabricate fine grained ZK60 magnesium alloys,the microstructure and hardness of the alloys at various conditions were investigated,the effect of extrusion temperature and pressing passes on ECAP were studied.The results showed that the optimal temperature range for ECAP of ZK60 magnesium alloy was 210～240℃,where a well grain refinement can be achieved;as increasing the number of ECAP pass,the grain size of ZK60 was reduce accordingly,but after 4 passes,the grain size refinement effect was slowed down.The hardness of ZK60 alloy after ECAP decreased as the ECAP temperature increased,while it increased as the number of ECAP passes increased.The grain refinement mechanism for ECAP of ZK60 alloy was supposed to be continuous dynamic recovery and recrystallization.更多还原