网状结构TiBw/Ti60复合材料高温变形组织重构及演变机制研究

High temperature titanium alloy matrix composites make full use of advantages of high temperature properties, which has important practical significance to enhance the application potential of the structural materials in the aerospace area at 600-800 ℃. Base on the previous research on the fabrication of the TiBw/Ti60 with network architecture by the powder metallurgy route, this project will further research on the deformation behavior in the near beta phase region or beta phase region. Because the grain and grain boundaries of beta phase can not be observed directly . In this project, the phase structure in high temperature beta region at different deformation parameters will be reconstructed by the EBSD method, and reconstruction results on the same deformation parameters with different cooling rates will be compared, which is aimed to verify and modification of the reconstruction process. The purport of this project is to clarify phase microstructure evolution of the TiBw/Ti60 composites with network structure during high temperature deformation, reveal deformation mechanism the TiBw/Ti60 composite in different regions and the common mechanism of deformation parameters and cooling rates on the formation of the matrix organization, directly establish the relationship between the deformation parameters and the formation of final microstructure of TiBw/Ti60 composite, which can provide a theoretical basis for the plastic deformation and processing.

以高温Ti60合金为基体的钛基复合材料，在继承基体高温特性优势的同时可以进一步提高高温强度，对提升其在600-800℃航空航天领域结构材料的应用潜力具有重要的实际意义。本项目在前期粉末冶金路线制备TiBw/Ti60的基础上，进一步开展这种复合材料在近β相区或β相区热变形行为研究。针对复合材料中无法对高温β晶粒直接表征等问题，通过EBSD等方法对其在不同变形参数下高温β相组织进行重构，并分别对相同变形参数对不同冷却速度重构结果对比分析，对重构过程进行验证与修正。最终阐明网状结构TiBw/Ti60复合材料变形过程中高温β相组织演变规律；揭示网状结构TiBw/Ti60复合材料不同区域的变形机制；揭示变形条件和冷却速度对基体组织形成的共同作用机制，建立网状结构TiBw/Ti60复合材料变形参数与最终组织形成的直接关系，为其后续的塑性变形和加工提供理论基础。

以高温Ti60合金为基体的钛基复合材料，在继承基体高温特性优势的同时可以进一步提高高温强度，对提升其在600-800℃航空航天领域结构材料的应用潜力具有重要的实际意义。本项目在前期粉末冶金路线制备TiBw/Ti60的基础上，进一步开展这种复合材料在近β相区或β相区热变形行为研究。针对复合材料中无法对高温β晶粒直接表征等问题，通过EBSD等方法对其在不同变形参数下高温β相组织进行重构，并分别对相同变形参数对不同冷却速度重构结果对比分析，对重构过程进行验证与修正。最终阐明网状结构TiBw/Ti60复合材料变形过程中高温β相组织演变规律；揭示网状结构TiBw/Ti60复合材料不同区域的变形机制；揭示变形条件和冷却速度对基体组织形成的共同作用机制，建立网状结构TiBw/Ti60复合材料变形参数与最终组织形成的直接关系，为其后续的塑性变形和加工提供理论基础。