Relationship between structure, dynamics, and mechanical properties in metallic glass-forming alloys

Y. Q. Cheng; H. W. Sheng; E. Ma

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Relationship between structure, dynamics, and mechanical properties in metallic glass-forming alloys

机译：金属玻璃形成合金的结构，动力学和机械性能之间的关系

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Using Cu-Zr models, we demonstrate icosahedral ordering as a microscopic origin of the non-Arrhenius dynamical slowing down in metallic supercooled liquids. This correlation between the structural and dynamical heterogeneities underlies the evolution of the energy barrier for relaxation upon undercooling, as well as .the eventual glass transition that leads to the formation of bulk metallic glasses (MGs). Our analysis of the energy barrier to plastic relaxation in MGs relates their macroscopic strength and plasticity to the local structures developed in the MGs. The structure-dynamics perspective explains not only the composition-dependent mechanical properties but also the known correlation between the strength of MGs and the glass transition temperature.

机译：使用Cu-Zr模型，我们证明了二十面体有序化是金属过冷液体中非阿里尼乌斯动力学减慢的微观起源。结构和动力学异质性之间的这种相互关系是过冷时弛豫的能垒以及最终导致大块金属玻璃（MGs）形成的最终玻璃化转变的基础。我们对MG中塑性松弛的能量屏障的分析将它们的宏观强度和可塑性与MG中发展的局部结构联系起来。结构动力学的观点不仅解释了成分相关的机械性能，而且还解释了MG的强度与玻璃化转变温度之间的已知关系。

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《Physical review》 |2008年第1期|323-329|共7页
作者
Y. Q. Cheng; H. W. Sheng; E. Ma;
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正文语种 eng
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amorphous semiconductors; metals; and alloys; computer simulation of liquid structure;

机译：非晶半导体;金属;和合金;液体结构的计算机模拟;

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Relationship between structure, dynamics, and mechanical properties in metallic glass-forming alloys

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