TiZr基非晶复合材料在超塑性成形过程中结构和性能的变化机理

非晶合金复合材料（BMGCs）克服了非晶合金室温脆性的弱点，但成形困难。申请人认为过冷液相区的超塑性成形是该问题的有效解决方法，但迄今为止，关于BMGCs的超塑性成形未见报道。本项目以室温综合力学性能优异的TiZr基BMGCs为研究对象，在其过冷液相区进行齿轮的网格法超塑性成形实验。研究不同晶化体积分数BMGCs在齿轮的超塑性成形过程中的塑性流动行为、显微结构和力学性能的变化规律。解决BMGCs在超塑性成形过程中显微结构和性能的演变机制及其内在关联，以及晶体相含量对超塑性成形中BMGCs的结构和性能的影响机理等关键科学问题。研究成果可以为BMGCs的成形方法及零件的性能改善提供理论依据，加快BMGCs的工程化应用进程。

Bulk metallic glass composites (BMGCs) has overcome the brittleness of bulk metallic glasses at room temperature, but still suffers from the difficulty in processing. In my opinion, superplastic forming in the supercooled liquid region of BMGCs is an effective technique to solve this problem. But superplastic forming of BMGCs has not been reported up to now. In this project, the typical gear part was taken as an example and fabricated by superplastic forming technology in the supercooled liquid region using TiZr-based BMGCs with excellent mechanical properties at room temperature. The plastic flow behavior, evolution regularity of microstructure and mechanical properties of the BMGCs with various volume fractions of crystalline dendritic phases in the superplastic forming process of gear was studied by mesh method. In this way, some key scientific problems such as the mechanism and inner relationship of microstructure evolution and mechanical property change, and the effect of volume fraction of crystalline dendritic phases on the microstructure evolution and mechanical property change of BMGCs during the superplastic forming process will be solved. The results will not only provide a theoretical foundation for the forming technology of BMGCs and performance improvement of the BMGCs part, but also accelerate the engineering application process of BMGCs.