Microstructure and High Damping Properties of Mg-Zn-Y Alloys Containing LPSO Phase and I Phase

摘要:

研究了含有LPSO相和I相的高阻尼Mg-Zn-Y合金。通过光学显微镜(OP)和SEM电镜观察了高阻尼Mg80Y4Zn16 (at%)合金的显微组织。此外，差热分析(DTA)用来分析其相变。对不同固溶时间 (3, 6, 9 h) 的组织演变和阻尼特性进行了详细研究。结果表明， Mg80Y4Zn16合金相的主要成分是α-Mg, Mg12ZnY, Mg3Zn6Y及 Mg10ZnY2相，首次报道了该合金中I相和LPSO相共存。该合金的平均阻尼值是0.03，这表明其为高阻尼合金; 阻尼是应变振幅依赖型。对合金的高阻尼机制也进行了详细地讨论。

Abstract:

A high damping Mg-Zn-Y alloy containing LPSO phase and I phase was investigated. The microstructure of a high damping Mg80Y4Zn16 (at%) alloy was examined by optical microscopy (OM) and SEM. Furthermore, the differential thermal analysis (DTA) was used to analyze its phase transformation. Microstructure evolution and damping properties under the conditions of the different solid solution time (3, 6, 9 h) were studied. The results show that the main phase component of the Mg80Y4Zn16 alloy is α-Mg, Mg12ZnY (X phase), Mg3Zn6Y (I phase) and Mg10ZnY2 phase (LPSO phase), in which I phase and LPSO phase coexistence is firstly reported. The average damping value of the alloy is 0.03, indicating that it is a high damping alloy. The damping is strain amplitude dependent. The high damping mechanism was also discussed.