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采用动态机械分析仪(DMA)及电子式万能试验机研究了微量Y对Mg-0.6Zr合金阻尼行为和力学性能的影响,分析了合金的阻尼特性随应变振幅及温度变化的机制。结果表明,添加微量Y(0.5wt%)后,其细晶强化和固溶强化作用提高了Mg-0.6Zr合金的抗拉强度、屈服强度和伸长率。同时由于Y的加入,合金晶界数量增多,对位错运动的进一步阻碍作用使合金的应变振幅效应降低,从而降低了其阻尼性能。研究还发现,Mg-0.6Zr合金及Mg-0.6%Zr-0.5%Y分别在65和75℃处出现一个明显的阻尼峰,且当温度分别达到200和250℃时,合金的阻尼性能随温度升高而急剧增加。
The dynamic mechanical analyzer (DMA) and electronic universal testing machine were used to study the influence of trace Y on the damping behavior and mechanical properties of Mg-0.6Zr alloy. The damping characteristics of the alloy were analyzed with strain amplitudes and temperature changes. The results show that the addition of a trace amount of Y (0.5wt%) increases the tensile strength, yield strength and elongation of the Mg-0.6Zr alloy by its grain refinement and solution strengthening. At the same time, due to the addition of Y, the number of grain boundaries increases and the further impeding effect on the dislocation movement reduces the strain amplitude effect of the alloy, thereby reducing its damping performance. The study also found that Mg-0.6Zr alloy and Mg-0.6% Zr-0.5% Y showed a distinct damping peak at 65 and 75 ℃, respectively. When the temperature reached 200 and 250 ℃ respectively, Rise and increase dramatically.