Relationship between structure, dynamics, and mechanical properties in metallic glass-forming alloys
Relationship between structure, dynamics, and mechanical properties in metallic glass-forming alloys
复制标题
DOI：
10.1103/physrevb.78.014207
复制
发表时间：
2008-07-01
影响因子：
3.7
通讯作者：
Ma, E.
中科院分区：
文献类型：
--
作者：
Cheng, Y. Q.;Sheng, H. W.;Ma, E.
利用铜-锆模型，我们证明了二十面体有序是金属过冷液体中非阿累尼乌斯动力学慢化的微观起源。结构和动力学异质性之间的这种相关性是过冷时弛豫势垒演化的基础，也是导致大块金属玻璃(MGs)形成的最终玻璃转变的基础。我们对磁致伸缩材料的塑性松弛能垒的分析将其宏观强度和塑性与磁致伸缩材料中形成的局域结构联系起来。结构动力学观点不仅解释了组份相关的力学性能，而且还解释了已知的MG的强度与玻璃化转变温度之间的关系。
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.