金属玻璃基复合材料的变形行为及本构关系研究综述

金属玻璃及其复合材料因其优良的力学性能而具有良好的应用前景,相关研究方兴未艾. 本文主要总结国内外的研究成果并结合本课题组的最新研究工作,针对块体金属玻璃基复合材料的变形行为、增韧机理和本构关系研究现状进行较为全面的综述. 首先,对近几十年来在块体金属玻璃基体材料的变形行为与失效机理以及本构关系研究方面的丰硕成果进行简要回顾. 其次,从实验研究和数值模拟两方面,重点对金属玻璃基复合材料的变形行为与失效机理研究成果进行介绍,总结了金属玻璃基复合材料的塑性变形、增韧机理及影响因素. 然后,对金属玻璃基复合材料的本构关系研究最新进展进行评述,重点介绍了均匀化方法在该领域的应用. 作为代表,较为详细地介绍了作者新近提出的一个二次均匀化的方法,并在此基础上,结合纳米孔洞作为自变量的失效判据而建立了本构模型,该模型对金属玻璃基复合材料的变形和失效行为进行了合理预测. 最后,对该领域的研究现状进行简单的总结,并对未来的研究问题进行展望. 

REVIEW ON THE DEFORMATION BEHAVIOR AND CONSTITUTIVE EQUATIONS OF METALLIC GLASS MATRIX COMPOSITES 1)

Metallic glass and metallic glass matrix composites have good application prospects because of their excellent mechanical properties, and now more and more researches have been conducting on them. The deformation behavior, toughening mechanism and constitutive relationship of metallic glass matrix composites are summarized and reviewed in this paper, based on the existing research results in literature by other groups and the latest work done by the authors. Firstly, the research progress in the deformation behavior, failure mechanism and constitutive relation of metallic glass in recent decades is briefly reviewed. Then, the state-of-the-arts in the deformation behavior and failure mechanism of metallic glass matrix composites are introduced from the aspects of experiments and numerical simulation, and the plastic deformation, toughening mechanism and their correspondent influencing factors of metallic glass matrix composites are summarized. Furthermore, the existing studies on the constitutive equations of metallic glass matrix composites are reviewed, with emphasis on the application of homogenization method in this field. In addition, a two-stepped homogenization method proposed by the authors is introduced in more details as a representative approach, and then the constitutive model established on the two-stepped homogenization method and with a help of a failure criterion obtained by introducing a concentration of nano-voids as an internal variable is addressed. The deformation and failure behavior of metallic glass matrix composites are predicted reasonably by the proposed constitutive model. Finally, the research progress of this field is briefly summarized, and some future topics are suggested.