采用氩气保护条件下真空熔炼的方法熔炼出MgZivYukUzl.4at.%)合金,并运用SEM、XRD及阻尼测试方法对合金的组织结构和阻尼性能进行分析和讨论。结果表明,合金中主要包含镁基体和长周期堆垛相,随着Zn和Y含量的增加,合金中晶粒逐步细化,长周期堆垛相含量增多,并且针状或带状的长周期堆垛相互穿插在一起。阻尼测试的结果表明,长周期堆垛相的增加有利于镁合金的阻尼性能,Mg-7%Zn-12.8%Y合金在高应变阶段阻尼最优,其阻尼值达到0.04。
The microstructure and damping capacities of MgZnxYi.33x(x=l-4at.%)alloys were discussed and researched.The main phase composition of the alloys consists of a_Mg and long-period stacking ordered(LPSO)phase.Due to increasedLPSO phase,grain size was refined.LPSO phase was advantageous to the damping properties of the Mg-Zn-Y alloys.Mg-7%Zn-12.8%Y has the highest damping capacity up to0.04.Due to stacking fault probability,the LPSO phase in the Mg-Zn-Yalloys could be new damping source to dissipate energy so as to contribute to the improvement of damping capacities.