(华中科技大学 材料成型与模具技术国家重点实验室，武汉 430074)
摘 要: 在Mg-0.6%Zr高阻尼合金中加入质量比为5的Zn与Y元素，通过普通铸造方法向其中引入Mg-Zn-Y系准晶进行强化，并在此基础上研究准晶增强Mg-0.6%Zr合金的力学和阻尼性能。结果表明：Mg-5xZn-xY-0.6%Zr合金中生成一定含量的I-Mg3YZn6准晶相，I相的生成能大幅度提高Mg-0.6%Zr合金的力学性能；常温下Mg-5xZn-xY-0.6%Zr合金的阻尼行为可由G−L位错模型解释，高温下界面阻尼机制启动，合金的阻尼值急剧升高；I相等准晶颗粒对晶界有钉扎作用，导致高温下Mg-4.5%Zn-0.9%Y-0.6%Zr等合金的阻尼性能不如Mg-0.6%Zr合金的。
关键字: Mg合金；准晶；阻尼性能；力学性能；位错；G-L模型
（State Key Laboratory of Materials Processing and Die & Mould Technology,
Huazhong University of Science and Technology, Wuhan 430074, China）
Abstract:Zn and Y elements with a mass ratio of 5 were adopted to fabricate Mg-Zn-Y quasicrystal through convention cast method to strength the Mg-0.6%Zr high damping magnesium alloy, based on which the damping behavior of the quasicrystal-reinforced Mg-0.6%Zr alloy was investigated. The results show that a certain content of I-Mg3YZn6 quasicrystal phase generates in the Mg-5xZn-xY-0.6%Zr alloys, and the mechanical properties are substantially enhanced compared with that of the Mg-0.6%Zr alloy. The damping behavior of Mg-5xZn-xY-0.6%Zr alloys at room temperature can be explained by G−L dislocation model, while at high temperature, the damping value of the alloys increases rapidly because the interface damping mechanism starts. The crystal boundary is pinned by the quasicrystal particles, like the I-phase, which results in the damping capacity of Mg-5xZn-xY-0.6%Zr alloys at elevated temperature is lower than that of Mg-0.6%Zr alloy.
Key words: magnesium alloy; quasicrystal; damping property; mechanical property; dislocation; G−L model
