中文摘要：

采用冷喷涂技术沉积Ti-80Al（质量分数,%）复合涂层,通过热处理获得了原位自生TiAl3金属间化合物颗粒增强Al基复合材料涂层。采用SEM、EDS和XRD等分析了冷喷涂Ti/Al复合涂层在不同热处理温度下的组织结构演变规律及Ti、Al粒子间原位扩散反应过程,并对TiAl3金属间化合物的形成机理进行了探讨。结果表明,冷喷涂Ti/Al复合涂层组织致密,其相结构与喷涂粉末完全相同,450℃热处理后涂层局部区域发生Ti、Al间的固态扩散反应,并在Ti、Al粒子界面原位形成TiAl3金属间化合物,随着热处理温度升高,TiAl3金属间化合物的含量显著增加,600℃热处理后,Ti/Al复合涂层中的Ti粒子全部转变为TiAl3金属间化合物,获得原位自生TiAl3颗粒增强的Al基复合材料。

英文摘要：

The Ti-80Al（wt%） composite was deposited by cold spraying of Ti/Al mixed powder and Al matrix composite reinforced with in-situ TiAl3 intertermtallic particles was prepared through annealing treatment of the above-mentioned cold-sprayed Ti/Al deposit. The microstructure of TiAl3/Al composite during annealing was investigated by SEM, EDS and XRD. The solid diffusion reaction between Ti and Al particles in the annealed Ti/Al deposit was studied and the formation mechanism of TiAl3 intermetallics was also investigated. Results show that the as-sprayed Ti/Al deposit exhibits dense microstructure and has the same phase constitutes as the feedstock powder. The solid diffusion reaction between Ti particles and Al particles occurs in a local area of Ti/Al deposit when annealing at 450 °C and consequently in-situ TiAl3 intermetallics are formed. With the annealing temperature increasing, the content of TiAl3 intermetallics continuously increases. After annealing at 600 °C, all Ti particles in the Ti/Al deposit completely transform into TiAl3 intermetallics; as a result, the Al matrix composite reinforced with in-situ TiAl3 intermetallics particles are obtained.