Local heating associated with crack tip plasticity in Zr-Ti-Ni-Cu-Be bulk amorphous metals

被引:143
作者
Flores, KM [1 ]
Dauskardt, RH [1 ]
机构
[1] Stanford Univ, Dept Mat Sci & Engn, Stanford, CA 94305 USA
关键词
D O I
10.1557/JMR.1999.0642
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Deformation in metallic glasses is generally considered to arise from flow in localized shear bands, where adiabatic heating is thought to reduce glass viscosity, Evidence has been inferred from the veined fracture surfaces and molten droplets reported for metallic glasses. In this work, the detailed spatially resolved surface temperature increase and subsequent dissipation associated with crack tip plasticity in a Zr-Ti-Ni-Cu-Be bulk metallic glass is characterized for the first time. Maximum temperatures of up to 54.2 K were estimated from a heat conduction model and shown to be in excellent agreement with a nonhardening plasticity model for the heat generated by a propagating crack. Local cooling was also observed and shown to be consistent with thermoelastic effects.
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页码:638 / 643
页数:6
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