(華中科技大學(xué) 材料成型與模具技術(shù)國(guó)家重點(diǎn)實(shí)驗(yàn)室，武漢 430074)
摘 要: 在Mg-0.6%Zr高阻尼合金中加入質(zhì)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(zhǔn)晶進(jìn)行強(qiáng)化，并在此基礎(chǔ)上研究準(zhǔn)晶增強(qiáng)Mg-0.6%Zr合金的力學(xué)和阻尼性能。結(jié)果表明：Mg-5xZn-xY-0.6%Zr合金中生成一定含量的I-Mg3YZn6準(zhǔn)晶相，I相的生成能大幅度提高M(jìn)g-0.6%Zr合金的力學(xué)性能；常溫下Mg-5xZn-xY-0.6%Zr合金的阻尼行為可由G−L位錯(cuò)模型解釋，高溫下界面阻尼機(jī)制啟動(dòng)，合金的阻尼值急劇升高；I相等準(zhǔn)晶顆粒對(duì)晶界有釘扎作用，導(dǎo)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(guān)鍵字: Mg合金；準(zhǔn)晶；阻尼性能；力學(xué)性能；位錯(cuò)；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
