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The effect of thermal history on structure and mechanical properties of Cu64Zr36 metallic glass

机译:热史对Cu64ZR36金属玻璃结构和力学性能的影响

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摘要

It is well known that the thermal history can affect the local atomic structure and thus may possibly affect the mechanical properties of metallic glasses (MGs). In spite of considerable efforts on the thermal history, its effect on the microstructure remains controversial at the present time. In this work, the combined effect of cooling rate and liquid temperature on the microstructure and mechanical properties are systematically investigated by molecular dynamics simulations. With the decrease of cooling rate, the polyhedrons with higher local five-fold symmetry is greatly enhanced, and thereby the ultimate compressive strength is increased. However, the effect of liquid temperature on the formation of MGs is negligible, mainly due to the relatively high cooling rates adopted. This work may increase our understanding in the effect of thermal formation history on the formation of MGs and provide a promising avenue for improving the mechanical properties.
机译:众所周知,热历史可以影响局部原子结构,因此可能影响金属玻璃(Mgs)的机械性能。 尽管在热历史上努力,其对微观结构的影响仍然存在争议。 在这项工作中,通过分子动力学模拟系统地研究了冷却速率和液体温度对微观结构和机械性能的综合影响。 随着冷却速率的降低,具有较高局部五倍对称性的多色支镍大大提高,从而增加了最终的抗压强度。 然而,液体温度对Mgs形成的影响可忽略不计,主要是由于采用的相对高的冷却速率。 这项工作可能会增加我们对热形成史对MGS形成的影响的理解,并提供了提高机械性能的有希望的大道。

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