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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 effects of extrusion temperature and extrusion ratio on the mechanical and damping properties of Mg-0.6Zr-0.5Y alloy were studied systematically. The microstructure, mechanical properties and damping properties of the alloy were analyzed by means of optical microscope, electronic universal testing machine and dynamic mechanical analyzer (DMA). The relationship between the grain refinement and the mechanical and damping mechanism of the alloy inner relationship. The results show that the dynamic recrystallization of the alloy takes place during the extrusion process, and the grain refinement significantly improves the mechanical properties. The damping properties of the as-cast alloy are the highest. After extrusion, the damping properties of the alloy are significantly reduced. Temperature decreases, the extrusion ratio increases, the damping properties of the alloy gradually decreased. The damping properties of the alloy can be explained by the G-L dislocation pinning-detachment model as the extrusion process changes.