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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),研究了固溶处理温度(TH)和固溶处理时间(tH)对挤压态Mg-0.6Zr-0.5Y合金显微组织、力学和阻尼性能的影响。结果表明:合金在固溶处理过程中发生静态再结晶,并随固溶处理温度升高,合金晶粒长大,与挤压态相比力学性能降低而阻尼性能提高;400℃固溶处理时,随保温时间延长,合金阻尼性能提高,但保温时间继续延长到8h时,在晶界交叉处出现细小晶粒,使合金力学性能提高而阻尼性能下降。固溶处理工艺对合金阻尼性能的影响规律可用G-L理论来解释。
The effects of solution treatment temperature (TH) and solution treatment time (tH) on the microstructures of extruded Mg-0.6Zr-0.5Y alloy were studied by optical microscope, electronic universal testing machine and dynamic mechanical analyzer (DMA) Effect of micro-organization, mechanics and damping performance. The results show that the alloy recrystallizes in the course of solution treatment. With the increase of the solution treatment temperature, the alloy grains grow up, the mechanical properties decrease compared with the extruded state, and the damping properties improve. With the increase of holding time, the damping performance of the alloy is improved. However, when the holding time is extended to 8h, fine grains appear at the intersection of the grain boundaries, which leads to the improvement of the mechanical properties and the damping performance of the alloy. The effect of solution treatment on the damping properties of alloys can be explained by G-L theory.