Ti基内生非晶复合材料流变成形的凝固行为及组织控制

兼具高强和高韧特性的非晶复合材料在国防军工、航空航天、交通运输和石油化工等领域具有重要的应用前景，短流程、近终形制备成形技术及理论缺失已成为限制其应用的“瓶颈”问题。本项目以内生枝晶相Ti基非晶复合材料为研究对象，以非晶复合材料流变成形过程的凝固行为与组织控制为目标，围绕非晶复合材料熔体半固态组织结构形成规律及机制、流变成形过程的组织演变以及流变成形非晶复合材料的力学响应等关键科学问题，建立半固态非晶复合材料熔体凝固模型，明确非枝晶组织形成条件及机制，充分认识热-力耦合作用下半固态流变成形过程中微观组织的演变规律及机制，探明流变成形非晶复合材料微观结构与力学性能之间关系，为内生非晶复合材料流变成形与组织调控奠定基础，推动内生非晶复合材料的实际工程应用。

Bulk metallic glass composites (BMGCs) with high strength and high toughness have significant application prospects in the fields of defense military, aerospace, transportation and petrochemicals, etc.. Near-net-shape forming technology is the key to their applications and is currently the bottleneck problem. This project will select Ti-based BMGCs with the in-situ formed ductile phase to study the solidification behaviors and microstructure control during rheological forming process. The key fundamentals including microstructure evolution of semi-solid slurry and rheological forming process, the mechanical response of the rheological formed BMGCs will be revealed. A model describing the solidification behaviors of semi-solid BMGC slurry will be established to clarify the formation conditions and mechanism of non-dendritic structure. In the thermal-mechanical coupled field, the law and mechanism of microstructure evolution will be fully understood during semi-solid rheological forming process. The relationship between the structure and mechanical properties of rheological formed BMGCs will be explored. These findings will lay a solid foundation for rheological forming and microstructure regulation, and promote the practical engineering application of in-situ BMGCs.