论文标题
Zr $ _ {50} $ CU $ _ {40} $ ag $ _ {10} $金属合金的弹性属性和玻璃形成能力
Elastic Properties and Glass Forming Ability of the Zr$_{50}$Cu$_{40}$Ag$_{10}$ Metallic Alloy
论文作者
论文摘要
The elastic properties of the Zr$_{50}$Cu$_{40}$Ag$_{10}$ metallic alloy, such as the bulk modulus $B$, the shear modulus $G$, the Young's modulus $E$ and the Poisson's ratio $σ$, are investigated by molecular dynamics simulation in the temperature range $T=250-2000$ K and at an external pressure $ p = 1.0 $ bar。结果表明，液态玻璃过渡伴随着剪切模量$ g $和Young的模量$ e $的大幅增加（超过$ 50 \％$）。泊松比的温度依赖性显示出大约0.32-0.33 $到低值（接近零）的金属的典型值急剧下降，这对于脆性散装金属眼镜而言是特征。还观察到还观察到液态玻璃过渡附近的纵向和横向声速的非单调温度依赖性。合金的玻璃形成能力是根据脆性指数$ m $进行评估的。如发现，Zr $ _ {50} $ CU $ _ {40} $ ag $ _ {10} $金属玻璃的值为$ M \ of64 $，与基于ZR-CU的Metallic镜子的实验数据达成了很好的协议。
The elastic properties of the Zr$_{50}$Cu$_{40}$Ag$_{10}$ metallic alloy, such as the bulk modulus $B$, the shear modulus $G$, the Young's modulus $E$ and the Poisson's ratio $σ$, are investigated by molecular dynamics simulation in the temperature range $T=250-2000$ K and at an external pressure of $p = 1.0$ bar. It is shown that the liquid-glass transition is accompanied by a considerable increase in the shear modulus $G$ and the Young's modulus $E$ (by more than $50\%$). The temperature dependence of the Poisson's ratio exhibits a sharp fall from typical values for metals of approximately $0.32-0.33$ to low values (close to zero), which are characteristic for brittle bulk metallic glasses. Non-monotonic temperature dependence of the longitudinal and transverse sound velocity near the liquid-glass transition is also observed. The glass forming ability of the alloy is evaluated in terms of the fragility index $m$. As found, its value is $m\approx64$ for the Zr$_{50}$Cu$_{40}$Ag$_{10}$ metallic glass, that is in a good agreement with the experimental data for the Zr-Cu-based metallic glasses.
