基于微观结构非均匀性的非晶合金力学行为  

Mechancial properties of amorphous alloys:In the framework of the microstructure heterogeneity

作　　者：乔吉超 张浪渟 童钰 吕国建 郝奇 陶凯 QIAO Jichao;ZHANG Langting;TONG Yu;LYU Guojian;HAO Qi;TAO Kai(School of Mechanics,Civil Engineering and Architecture,Northwestern Polytechnical University,Xi’an 710072,China)

机构地区：[1]西北工业大学力学与土木建筑学院,西安710072

出　　处：《力学进展》2022年第1期117-152,共36页Advances in Mechanics

基　　金：国家自然科学基金(51971178);陕西省杰出青年科学基金(2021JC-12);西北工业大学博士论文创新基金(CX2021015)资助项目。

摘　　要：非晶合金弛豫/晶化、玻璃转变、塑性变形等热力学和动力学行为都与其固有的结构非均匀性密切相关.但是,由于淹没在亚稳的长程无序结构中,探究非晶合金的结构非均匀性十分困难.尤其,非晶合金微观结构非均匀性与其力学性能之间的本征关联是一个亟待解决的重要科学问题.本文基于多尺度时空下的力学激励阐述非晶合金微观结构非均匀性特征与演化规律.从实验、理论和数值模拟方面出发,梳理了非晶合金微观结构非均匀性与弛豫机制和力学行为之间的关联.最后,针对非晶合金微观结构非均匀性与其物理/力学性能研究的方向提出了建议和展望.The intrinsic structural heterogeneities of amorphous alloys are closely related to the thermodynamics and dynamical behavior,such as relaxation/crystallization,glass transition phenomenon and plastic deformation.However,the structural information is submerged into the meta-stable disordered long-range structure,which made it very difficult to explore the structural heterogeneities of amorphous alloys.Specificlly,the correlation between the microstructural heterogeneity and mechanical properties of amorphous alloys is one of important scientific issues.The current paper reviews the structural heterogeneity of dynamics into the amorphous alloys from the time-scale point of view and inspected the relaxation of structure with various spatial scales.From the perspective of experimental results,theoretical analysis and numerical simulations,the correlation between heterogeneous structure and the dynamic relaxations,deformation mechanisms,mechanical properties and dynamic characteristics were discussed.Finally,we discuss the further development of structural heterogeneity of amorphous alloys.

关 键 词：非晶合金 微观结构非均匀性 力学激励 结构弛豫 力学行为 

分 类 号：TG139.8[一般工业技术—材料科学与工程]