挤压工艺对Mg-0.6Zr-0.5Y合金力学和阻尼性能的影响  

Influence of extrusion process on mechanical and damping capacities of Mg-0.6Zr-0.5Y alloy

作　　者：于文浩[1] 李宁[1] 颜家振[1] 胡斌[1] 

机构地区：[1]四川大学制造科学与工程学院,四川成都610065

出　　处：《功能材料》2011年第B06期408-410,415,共4页Journal of Functional Materials

摘　　要：系统地研究了挤压温度和挤压比对Mg-0.6Zr-0.5Y合金力学和阻尼性能的影响规律。采用光学金相显微镜、电子式万能试验机及动态机械分析仪(DMA)等手段分析合金显微组织、力学和阻尼性能的变化,并讨论了晶粒细化与合金力学和阻尼机理之间的内在联系。研究发现,合金在挤压过程中发生了动态再结晶,晶粒显著细化,使综合力学性能得到提高;铸态合金阻尼性能最高,经挤压后,阻尼性能显著下降,且随着挤压温度降低、挤压比增加,合金阻尼性能逐渐下降。合金阻尼性能随挤压工艺的变化可用G-L位错钉扎-脱钉模型来解释。The influence of extrusion temperature and extrusion ratio on mechanical capacity and damping capaci- ty of Mg-0.6Zr-0.5Y alloy was investigated in this paper. The microstructure, mechanical capacity and damping capacity of Mg-0. 6Zr-0. 5Y alloy were studied by using the metallographic microscope, universal testing mechine and dynamic mechanical analyzer （DMA）. The relationship between the grain refinement and the mechanical, damping mechanism were also discussed. The results showed that the dynamic recrystallization occurred during hot extrusion process, and significant grain refinement improved the mechanical property of the investi- gated alloys. Damping capacity of the as-cast alloy is maximum, and it decreased significantly by extrusion process. With the extrusion temperature decreased, extrusion ratio increased, the damping capacity decreased gradually. The influences of different extrusion process on damping properties can be explained by the G-L theory.

关 键 词：Mg-0.6Zr-0.5Y合金 挤压工艺 晶粒细化 力学性能 阻尼性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]