涂层Ti纤维增强TiAl基复合材料

TiAl MATRIX COMPOSITES REINFORCED BY Ti-FIBER COATED WITH Al_2O_3

研究了涂覆Ａｌ_２Ｏ_３的Ｔｉ纤维增强γ－ＴｉＡｌ基复合材料，分析了界面结构和力学性能特征。结果表明，采用物理气相沉积法在Ｔｉ纤维表面涂覆Ａｌ_２Ｏ_３增强ＴｉＡｌ基复合材料，使ＴｉＡｌ合金的弯曲强度从４４９ＭＰａ提高到５７３ＭＰａ，即提高了２８％；弯曲挠度变化不明显；Ｔｉ纤维与ＴｉＡｌ基体间的界面反应层厚度由原来的３０μｍ减小到２０μｍ。

TiAl intermetallic matrix composites reinforced by Ti-fiber coated with Al2O3 are presented and interface structure and mechanical behavior are analysed briefly.Experimentation results show the room temperature bending strength of TiAl matrix composites reinforced by Tifiber coated with Al2O3 can be increased from 449Mpa(unreinforced)to 573Mpa,i.e.28%,the plastic defleci n of the composites is about the same,as compared with γ-TiAl.Thickness of the interfacial reaction layer of the fiber/matrix can be decreased from 30μm(uncoated)to 20μm.