液态置氢钛基复合材料的组织调控和高温软化机理研究

Poor thermal deformation ability is the limitation of titanium matrix composites prepared by casting.Our research group proposed melt hydrogenation method to solve this problem. Titanium matrix composites were hydrogenated during the casting process with a very high hydrogenation rate. Melt hydrogenation can affect the preparation and deformation of the composites. The project will establish thermodynamic and kinetic models of hydrogen solubility of composite materials to reveal the hydrogen absorption process.The effect of melt hydrogenation on impurity elements in matrix and interface of composite materials will be studied to reveal the purification mechanism.The effect of melt hydrogenation on matrix, ceramic phase and interface morphology of composite materials will be studied to reveal the mechanism of hydrogen on the solidification process.The effect of hydrogen on the deformation behavior of titanium matrix is studied to reveal the mechanism of hydrogen on dynamic recovery, dynamic recrystallization, slippage, dislocation and twins. The effects of melt hydrogenation on deformation, fracture and kinematic behavior of ceramic phase is studied. The variation of the interface position and morphology is studied, and the synergistic deformation mechanism of the matrix, ceramic phase and interface is clarified. The mechanism of softening and plasticizing of melt hydrogenation on the deformation process of composites is revealed.These study can provide theoretical and experimental basis for the high efficiency, high quality and low cost preparation and processing of titanium matrix composites.

热加工难度大是限制熔铸法制备钛基复合材料应用和发展的瓶颈问题。本课题组提出液态置氢方法来解决这个难题，液态置氢与熔铸过程同步进行，无需单独的氢处理过程，吸氢速度非常快，对复合材的制备和变形过程都产生影响。本项目将建立钛基复合材料的氢溶解热力学和动力学模型，揭示复合材料的吸氢过程；研究复合材料基体和界面的杂质元素含量，揭示氢对基体和界面的净化机理；探索氢对基体、增强相和界面形态的影响规律，揭示氢对复合材料凝固路径和组织形态的影响机理。研究液态置氢对复合材料基体变形行为的影响规律，揭示氢对动态回复、动态再结晶和滑移、位错、孪晶的影响机理；研究液态置氢对复合材料增强相变形、破碎和运动行为的影响规律；研究界面位置和形态的变化规律，阐明基体、增强相和界面的协同变形机制，揭示液态置氢对复合材料变形过程的软化和増塑作用机理。为实现钛基复合材料的高效率、高质量和低成本制备和加工提供新的理论依据和研究方法。

本项目通过液态置氢方法解决了熔铸法制备钛基复合材料热加工难度大的问题。制备过程中，液态置氢与熔铸过程同步进行，无需单独的氢处理过程，吸氢速度非常快，对复合材的制备和变形过程都产生影响。同时本项目探索了氢对基体、增强相和界面形态的影响规律，揭示氢对复合材料凝固路径和组织形态的影响机理。研究液态置氢对复合材料基体变形行为的影响规律研究液态置氢对复合材料增强相变形、破碎和运动行为的影响律；研究界面位置和形态的变化规律，阐明基体、增强相和界面的协同变形机制，揭示液态置氢对复合材料变形过程的软化和増塑作用机理。为实现钛基复合材料的高效率、高质量和低成本制备和加工提供新的理论依据和研究方法。