Measurement of strength in a Zr-based bulk metallic glass under dynamic high-pressure loading
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摘要: 为了研究Zr51Ti5Ni10Cu25Al9金属玻璃的高压强度特性，进行了平靶冲击实验。采用反向碰撞方式，运用DISAR技术测量金属玻璃样品/LiF窗口界面粒子速度剖面，分析粒子速度剖面获得了37~66GPa压力范围锆基金属玻璃的屈服强度和剪切模量。实验结果表明，在上述压力范围金属玻璃的屈服强度和剪切模量均显示出一定程度的压力硬化效应，分析表明金属玻璃冲击加载波阵面剪应力衰减并非由损伤/破坏或温度软化等因素导致。Abstract: To investigate the dynamic strength behaviors of a Zr-based bulk metallic glass(BMG), Zr51Ti5Ni10Cu25Al9(in atomic percent), a series of reverse-impact experiments were performed in the peak shock stress range from 37to 66GPa.A displacement interferometer system for any reflector(DISAR)was used to measure the particle velocity profiles at the sample/LiF window interface.By analyzing the measured particle velocity profiles, the yield strength and shear modulus of the Zr-based BMG were obtained.The experimental results show that both the yield strength and the shear modulus of the Zr-based BMG increase with the increasing of the shock stresses in the stress range considered here.And the shear stress relaxation across the shock wave front of the Zr-based BMG is not due to the shock-induced damage/failure or temperature softening.
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Key words:
- solid mechanics /
- yield strength /
- DISAR /
- bulk metallic glass /
- shear modulus /
- shock wave
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图 2 样品/窗口界面粒子速度剖面
Figure 2. Particle velocity profiles measured at sample/window interface
图 3 卸载过程的拉格朗日纵波和体波声速
Figure 3. Longitudinal and bulk Lagrangian wave speed during unloading
图 4 屈服强度和剪切模量随冲击压力的变化
Figure 4. Variation of yield strength and shear modulus with shock pressure
表 1 平靶冲击实验参数及结果
Table 1. Experimental conditions and results for four plate-impact experiments
No. ρ0/(g·cm-3) Hs/mm W/(km·s-1) σH/GPa (τH+τc)/GPa G/GPa 1 6.744 3.142 2.889 37.28 1.73 47.59 2 6.743 3.120 3.604 49.69 1.88 63.25 3 6.736 3.016 3.640 50.33 1.99 62.96 4 6.655 3.007 4.480 66.42 2.39 79.47 
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