CAJ | 학술논문

采用熔铸法制备TiB短纤维和La2O3颗粒混杂增强的近α型钛基复合材料，并采用合适的热加工工艺将其加工成板材。研究β热处理温度对原位自生(TiB+La2O3)/Ti复合材料的微观组织和力学性能的影响规律。采用OM和TEM研究钛基复合材料的微观组织，同时测试钛基复合材料的室温以及高温(923 K)拉伸性能。结果表明：随着β热处理温度的升高，原始β晶粒尺寸增大但是α集束的尺寸变小；室温拉伸强度随着β热处理温度的升高而提高，这主要是因为α集束尺寸随着β热处理温度的升高而降低；而高温拉伸强度则随着β热处理温度的升高而降低，这主要是由于原始β晶粒随着β热处理温度的升高而增大。
채용용주법제비TiB단섬유화La2O3과립혼잡증강적근α형태기복합재료，병채용합괄적열가공공예장기가공성판재。연구β열처리온도대원위자생(TiB+La2O3)/Ti복합재료적미관조직화역학성능적영향규률。채용OM화TEM연구태기복합재료적미관조직，동시측시태기복합재료적실온이급고온(923 K)랍신성능。결과표명：수착β열처리온도적승고，원시β정립척촌증대단시α집속적척촌변소；실온랍신강도수착β열처리온도적승고이제고，저주요시인위α집속척촌수착β열처리온도적승고이강저；이고온랍신강도칙수착β열처리온도적승고이강저，저주요시유우원시β정립수착β열처리온도적승고이증대。
Near-αtitanium matrix composites reinforced with TiB and La2O3 were synthesized by common casting and hot-working technology. The effects of β heat treatment temperature on the microstructure and the tensile properties of the in situ synthesized (TiB+La2O3)/Ti were studied. Microstructure was studied by OM and TEM, and tensile tests were carried out at room temperature and 923 K, respectively. Results show that with the increase ofβheat treatment temperature, priorβphase grain size increases andαcolony size decreases. Room temperature tensile strength increases with the increase ofβheat treatment temperature, which can be attributed to the decrease of α colony size with the increase of β heat treatment temperature. However, high-temperature tensile strength decreases with the increase ofβheat treatment temperature and the decrease of the high-temperature tensile strength is due to the increase of the priorβphase grain size.