微量Y对Mg-0.6Zr合金阻尼性能和力学性能的影响
Effect of Y Content on Damping Capacity and Mechanical Properties of Mg-0.6Zr Alloy
胡 斌, 李 宁, 颜家振, 于文浩
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作者单位：(四川大学 制造科学与工程学院, 四川 成都 610065)
中文关键字：Mg-0.6Zr合金； Y元素； 阻尼性能； 力学性能； 位错运动
英文关键字：Mg-0.6Zr alloy; Y element; damping capacity; mechanical properties; dislocation movement
中文摘要：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。
英文摘要：The effects of Y content on damping behavior and mechanical properties of Mg-0.6Zr alloy were investigated by dynamic mechanical analyzer and universal testing machine, and the damping mechanism depended on strain amplitude and temperature was also analyzed. The results show that the tensile strength, yield strength and elongation are improved by fine-grain intensification and solid solution intensification with the addition of Y. At the same time, the addition of Y and further impediment of the dislocation movement due to more grain boundary reduces the strain amplitude effect of the alloy, which reduces its damping capacity. It is also found that distinct damping peak (P1) of Mg-0.6Zr alloy appears at 65 ℃and damping peak (P2) of Mg-0.6Zr-0.5%Y alloy appears at 75 ℃, and when the temperature reaches 200℃and 250 ℃, respectively, the damping capacity of the alloy increases dramatically with the increase of temperature.