固溶处理对含长周期结构Mg97Zn1Y2合金显微组织及阻尼性能影响

Microstructure and damping of Mg97Zn1Y2 with or without solid solution treatment

摘要:

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,发现存在两个内耗峰：P1内耗峰位置在150-250℃附近,峰宽很宽,是由位错机制而引起的内耗峰；P2内耗峰位置在350-500℃附近,初步认为是晶界内耗峰。

Abstract:

The microstructure of as-cast Mg97Zn1Y2 with or without solid solution treatment was analysised by OM and SEM.Meanwhile, phase analysis was carried out by EDS and XRD. After solid solution treatment, LPSO phase grow up,turning into continuous distribution in Mg97Zn1Y2.Through damping testing, it was found that the damping capacity of Mg97Zn1Y2 was declined after solid solution treatment.The damping-temperture specturm of the as-cast Mg97Zn1Y2 with or without solid solution treatment was also analysised. There are two internal friction peaks:damping peak P1 located between 150 ℃ and 250 ℃ and the peak is very wide, which is caused by the dislocation mechanism.Meanwhile, the damping peak P2 is near the 350-500 ℃, which is preliminary considered as grain boundary internal friction peak.