非晶合金层状复合材料塑性稳定性的微观机制研究

非晶合金及其复合材料的强韧化是当前材料科学领域的研究热点，强韧相和非晶基体的性能和界面结构对非晶合金复合材料的塑性稳定性具有重要的影响。本项目设计和制备几种典型层状非晶合金复合材料，结合多尺度观察和高速原位成像技术，观察与分析非晶合金复合材料塑性变形过程中的变形协调性和塑性稳定性。主要研究内容为探索三种典型非晶合金复合材料，即枝晶增韧钛基非晶合金复合材料、应力诱导马氏体相变增韧非晶合金复合材料和非晶合金及其复合材料/晶态金属层状复合材料的界面力学行为，并分析和理解非晶合金复合材料的界面结构与塑性变形协调性和塑性稳定性之间的关系。本项目将揭示界面结构对非晶合金复合材料剪切带萌生扩展等微观变形断裂的影响机理，确定非晶合金复合材料剪切带多重化与宏观塑性稳定性的关系，为提高非晶合金及其复合材料的强韧性、塑性稳定性和使役性能提供实验证据和理论支持。

Strengthening and toughening of metallic glasses and their composites are the hot topics in the field of materials science. However, there is still space for understanding the relation between the reinforcer and the plastic stability of metallic glass composites. In this project, by using high-speed observation system in multiscale, the coordination and plastic stability of three types of metallic glass lamillar composites under tension, will be investigated. By controlling the solidification conditions and adjusting the chemical compositions, the mechanical behaviors of interface in monolithic, dendrite reinforced, and phase transformation toughened metallic glass lamillar composites will be observed and analyzed. Based on the experimental observaion and theoretical analysis, the micromechanism of plastic stability in metallic glass lamillar composites will be revealed. These research results should be helpful to understand the effect of interface structure on the shear banding and crack behaviors of metallic glass composites, and determine the relation between the macroscopic plastic stability and the multiplication of shear bands. It is useful to provide the important experimental results and theoretical consideration for designing new metallic glass composites with higher strength, large plastic stability, and good performance properties.