快速凝固制备Zr-Co-(Al)合金及其变形行为与强韧化机理

具有B2结构的韧性金属间化合物在制备高强高韧新材料领域有良好的潜力和广泛的应用前景，在近几年引起了人们的浓厚兴趣，但研究工作主要集中于大块金属玻璃方向，超细晶合金的研究还远远不够。本项目将采用快速凝固技术制备Zr-Co-(Al)合金，结合Al含量的调整和快速凝固工艺的控制来调控合金的组织结构，以期获得高性能超细晶B2相合金材料。并结合随后的形变诱导马氏体相变（DIMT）和相变诱导塑性（TRIP），全面提升材料的综合力学性能。项目实施过程中，系统开展Al元素含量与制备工艺对合金组织结构和性能的影响、合金变形行为、DIMT及TRIP的行为与机理、合金的强韧化机理等方面的研究工作。通过本项目的实施，一方面为该合金的实际生产和应用提供可靠的理论与实验依据，具有良好的实际应用价值；另一方面为弄清该合金的DIMT、TRIP和强韧化机理做出积极的贡献，具有较重要的科学理论意义。

Recently, a family of ductile intermetallics with B2 structure has renewed the research interests for their great potentials in the field of preparing high strength and high toughness structural materials as well as their extensive application prospects. However, more researches have focused on the field of bulk metallic glass (BMG). The research field of ultra-fine grain (UFG) alloy is still not enough. In this project, Zr-Co-(Al) alloys will be prepared by rapid solidification. The microstructure of these alloys will be investigated through the optimization of Al element amount and the process of rapid solidification in order to obtain UFG alloy including B2 phase with excellent performance. Then, these alloys will be deformed to improve their comprehensive mechanical properties by deformation-induced martensitic transformation (DIMT) and transformation-induced plasticity (TRIP). For these UFG alloys, the effects of Al element amount and the process of rapid solidification on the microstructures and mechanical properties, the deformation behaviors, the mechanisms of DIMT, TRIP, strengthening and toughening will also be investigated systematically. Through the implementation of the project, it will not only provide theoretical and experimental basis for the fabrication and application of this kind of alloys, but also improve the understanding of DIMT, TRIP, strengthening and toughening mechanisms of these alloys, which possesses important theoretical and practical value.