(華中科技大學 材料成型與模具技術國家重點實驗室，武漢 430074)
摘 要: 在Mg-0.6%Zr高阻尼合金中加入質量比為5的Zn與Y元素，通過普通鑄造方法向其中引入Mg-Zn-Y系準晶進行強化，并在此基礎上研究準晶增強Mg-0.6%Zr合金的力學和阻尼性能。結果表明：Mg-5xZn-xY-0.6%Zr合金中生成一定含量的I-Mg3YZn6準晶相，I相的生成能大幅度提高Mg-0.6%Zr合金的力學性能；常溫下Mg-5xZn-xY-0.6%Zr合金的阻尼行為可由G−L位錯模型解釋，高溫下界面阻尼機制啟動，合金的阻尼值急劇升高；I相等準晶顆粒對晶界有釘扎作用，導致高溫下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。
關鍵字: Mg合金；準晶；阻尼性能；力學性能；位錯；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
