ECAP路径对Al-10Mg-4Si合金组织及力学性能的影响  

Effect of ECAP Route on Microstructure and Mechanical Property of Al-10Mg-4Si Alloy

作　　者：边丽萍[1] 梁伟[1] 马建[1] 张文利[1] 薛晋波[1] 赵兴国[1] 王红霞[1] 

机构地区：[1]太原理工大学,山西太原030024

出　　处：《稀有金属材料与工程》2010年第A01期360-363,共4页Rare Metal Materials and Engineering

基　　金：大学生创新创业专项基金(08122067;07010727);山西省自然科学基金(2006011051);山西省留学人员基金(2007-25)资助

摘　　要：采用2A+4BA+2A混合路径对高含量Mg2Si的双相Al-10Mg-4Si合金在250℃进行ECAP8道次挤压来考察其对第二相颗粒分散及合金力学性能的影响,同时与BC路径挤压做对比。对铸态和挤压态合金采用SEM、TEM进行组织观察、室温拉伸试验进行力学性能测试。结果表明,2A+4BA+2A路径挤压使铸态合金组织明显细化、第二相颗粒均匀分布于基体、合金的力学性能显著提高,表明通过ECAP基本路径的组合来实现组织细化兼顾第二相均匀分散来进一步提高材料的力学性能是可行的。The two-phase Al-10Mg-4Si alloy containing high Mg2Si content was pressed by ECAP processing for 8 passes at 250 ℃ through route 2A＋4BA＋2A as well as route Bc for comparison. The microstructures of the ascast and as-pressed alloys were investigated by SEM and TEM and their mechanical properties were measured by tension test at room temperature. The results show that processing by route 2A＋4BA＋2A produces an appreciable refined microstructure associating with the rod-shaped Mg2Si second phase uniformly distributed in the matrix and thereby results in significantly-enhanced mechanical properties of the ECAPed alloy compared with the as-cast alloy. The study suggests that it is feasible to further enhance the mechanical property of materials by combined ECAP routes to achieve microstructure refinement as well as second-phase redistribution.

关 键 词：等通道转角挤压(ECAP/ECAE) Al-Mg—Si合金 第二相 晶粒细化 再分配 

分 类 号：TG146.21[一般工业技术—材料科学与工程]