Deformation and failure of Zr57Ti5CU20Ni8Al10 bulk metallic glass under quasi-static and dynamic compression
Deformation and failure of Zr57Ti5CU20Ni8Al10 bulk metallic glass under quasi-static and dynamic compression
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DOI：
10.1557/jmr.2002.0214
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发表时间：
2002-06-01
影响因子：
2.7
通讯作者：
Ramesh, KT
中科院分区：
文献类型：
--
作者：
Hufnagel, TC;Jiao, T;Ramesh, KT
研究了Zr_（57）Ti_（55）Cu_（20）Ni_（88）Al_（10）大块非晶合金在应变速率为10 ~（-4）~ 3 × 10 ~（3）s ~（-1）的单轴压缩条件下的力学行为。随着应变速率的增加，破坏应力降低，剪切带的形成仍然是主要的变形机制。考虑到绝热剪切带的基本性质，准静态加载下形成的剪切带似乎不太可能是绝热的;在动态情况下，变形和热传导的时间尺度是相似的，这表明需要更复杂的计算。然而，在动态测试中，高速摄影显示出的证据表明，故障的机制涉及绝热组件。
We have examined the mechanical behavior of Zr57Ti5Cu20Ni8Al10 bulk metallic glass under uniaxial compression at strain rates from 10(-4) to 3 x 10(3) s(-1). The failure stress decreases with increasing strain rate, and shear-band formation remains the dominant deformation mechanism. A consideration of basic properties of adiabatic shear bands makes it appear unlikely that shear bands formed under quasi-static loading are adiabatic; in the dynamic case, the time scales of deformation and thermal conduction are similar, indicating that a more sophisticated calculation is required. In the dynamic tests, however, high-speed cinematography reveals evidence that the mechanism of failure involves an adiabatic component.