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首页> 外文期刊>Journal of Materials Research >Local heating associated with crack tip plasticity in Zr-Ti-Ni-Cu-Be bulk amorphous metals
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Local heating associated with crack tip plasticity in Zr-Ti-Ni-Cu-Be bulk amorphous metals

机译：Zr-Ti-Ni-Cu-Be大块非晶金属中与裂纹尖端塑性相关的局部加热

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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 propagating crack. Local cooling was also observed and shown to be consistent with thermoelastic effects.
机译：金属玻璃的变形通常被认为是由于局部剪切带中的流动引起的，绝热加热被认为降低了玻璃的粘度。从金属玻璃的脉状断裂表面和熔滴中可以推断出证据。在这项工作中，首次表征了Zr-Ti-Ni-Cu-Be块状金属玻璃中详细的空间分辨表面温度升高以及与裂纹尖端塑性相关的后续耗散。根据导热模型估算的最高温度可达到54.2 K，并且与由于裂纹扩展而产生的热量的非硬化塑性模型非常吻合。还观察到局部冷却，并显示与热弹性效应一致。

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