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通过光学显微镜、扫描电镜分析了铸态及固溶处理态Mg97Zn1Y2合金的显微组织,并利用EDS,XRD进行了物相分析。研究发现,固溶处理后,Mg97Zn1Y2合金中的长周期结构相(long period stacking ordered,LPSO)发生长大,由离散分布变为连续分布。阻尼测试结果显示,固溶处理后Mg97Zn1Y2合金阻尼性能下降。通过对铸态及固溶处理态Mg97Zn1Y2合金进行阻尼-温度谱分析,发现存在2个内耗峰:P1内耗峰位置在150~250℃附近,峰宽很宽,是由位错机制引起的内耗峰;P2内耗峰位置在350~500℃附近,初步认为是晶界内耗峰。
The microstructure of as-cast and solution treated Mg97Zn1Y2 alloy was analyzed by optical microscope and scanning electron microscope, and the phase analysis was carried out by EDS and XRD. It was found that the long period stacking ordered (LPSO) growth in Mg97Zn1Y2 alloy changed from discrete distribution to continuous distribution after solution treatment. The results of damping test show that the damping capacity of Mg97Zn1Y2 alloy after solution treatment decreases. Through the damping-temperature spectrum analysis of as-cast and solution-treated Mg97Zn1Y2 alloy, it is found that there are two internal friction peaks: the peak position in P1 is around 150 ~ 250 ℃ and the peak width is wide, which is caused by the dislocation mechanism ; The peak position of P2 is around 350 ~ 500 ℃, which is preliminarily thought to be the peak in the grain boundary.