β相对Mg-Li变形合金显微组织与拉伸行为的影响  

Effect of the β phase on the microstructure and tensile behavior of Mg-Li wrought alloys

作　　者：宋猛[1] 沙桂英[1] 袁雷[1] 岳子健 李洋[1] 

机构地区：[1]沈阳航空航天大学材料科学与工程学院,辽宁沈阳110136

出　　处：《轻合金加工技术》2015年第5期63-66,共4页Light Alloy Fabrication Technology

摘　　要：对Mg-4Li-1Al合金和Mg-6Li-1Al合金铸锭进行了热挤压变形和拉伸试验,并分析了挤压后两种合金的显微组织和拉伸变形行为。结果表明:Mg-6Li-1Al合金铸锭经270℃热挤压之后,显微组织中β相优先于α相完成了再结晶。与Mg-4Li-1Al合金相比,β相的存在可以使Mg-6Li-1Al合金的屈服强度和塑性提高,并有效地抑制拉伸变形时的塑性不稳定性。Hot extrusion and tensile tests were carried out, and microstructure after extru- sion and deformation behavior during tensile tests were studied for the ingots of Mg-4Li-1 Al alloy and Mg-6Li-1 Al alloy. The results show that for the ingot of Mg-6Li-1 Al alloy hot-extru- ded at 270℃ , β phases are recrystallized earlier than α phases in the microstructure. Compared with Mg-4Li-1 Al alloy, β phases in Mg-6Li-1 Al alloy can enhance yield strength, im- prove ductility, and restrain plastic instability in the process of tensile deformation.

关 键 词：MG-LI合金 热挤压 显微组织 塑性不稳定性 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG113.25[金属学及工艺—金属材料]