The evolution of the texture and microstructure of TiB-TC25G composites, heat-treated in the high α+β phase field, have been studied with different cooling rates. The present study found that the size of α colonies and the thickness of individual secondary α laths increased with decreasing cooling rates. Slow cooling induces the formation of equiaxed secondary α grains in the β matrix of TiB-TC25G composites. Attributed to the TiB, the intensity of α texture in TiB-TC25G composites decreased with decreasing cooling rate, which is inconsistent with the results of variant selection during the β→α phase transformation in traditional titanium alloys. The misorientation analysis suggested that some of the equiaxed secondary α grains do not follow the Burgers orientation relationship (BOR) with the parent β grain. In this study, the role of TiB in influencing variant selection and the morphology of the secondary α phase with different cooling rates were analyzed.

研究了在不同冷却速率下在高α+β相场中热处理的TiB-TC25G复合材料的织构和微观结构的演变。本研究发现，随着冷却速度的降低，α菌落的大小和单个次生α板条的厚度增加。缓慢冷却导致在TiB-TC25G复合材料的β基体中形成等轴的次级α晶粒。归因于TiB，TiB-TC25G复合材料中α织构的强度随冷却速率的降低而降低，这与传统钛合金的β→α相变过程中的变体选择结果不一致。取向错误分析表明，某些等轴次生α晶粒与母β晶粒不遵循Burgers取向关系（BOR）。在这项研究中，