冷喷涂技术具有低温固态沉积特性，可以在开放环境下进行活性金属钛合金的沉积制备，是一种适用于钛合金增材制造的技术。但冷喷涂沉积机制属于机械咬合，非冶金结合，结合界面已经成为影响沉积层力学性能的关键。尽管许多研究者通过数值模拟和实验的方法对冷喷涂的沉积机制进行了研究，但研究主要集中于沉积层与基体的结合界面，且研究材料以软质纯金属为主，对硬度较高的活性金属的沉积层内界面结合机制、界面反应特征、诱发界面反应的微观机理还不明确。本项目选择航空航天领域应用最广泛的钛合金Ti-6Al-4V为研究对象，利用数值模拟与试验结合的方式研究冷喷涂沉积层中形变Ti-6Al-4V颗粒内位错、绝热温升、应力分布、射流、化学活性与界面反应的关系，揭示冷喷涂增材制造Ti-6Al-4V层界面反应机制及其微观诱发机制，讨论界面反应对界面结合强度的影响机理，明确影响增材制造Ti-6Al-4V材料界面力学行为的微观本质。

The advantages of cold spray technique are low deposition temperature and solid-state deposition. The active titanium alloy can be deposited by cold spray in the atmospheric environment, so it is suitable for additive manufacturing of titanium alloy. However, the bonding mechanism of cold-spraying deposition coating is not metallurgical bonding but mechanical interlocking, which have a severe impact on the mechanical property of deposition coating. Although many researchers have studied deposition theory which particles impacted on substrate by cold spray using numerical simulation and experiment, the research interest is focused on the bonding interface between coating and substrate and soft pure metals. Actually, it is still lack of adequate understanding for interface bonding, interfacial reaction and microcosmic mechanism inducing interfacial reaction of hard active metal materials. The Ti-6Al-4V alloy which has been widely applied in the aerospace industry is selected as the deposition powder material, the relations between dislocation, adiabatic temperature rise, stress distribution, metal jet and chemical activity of deformation Ti-6Al-4V particles in deposition coating and interfacial reaction are studied by finite element method and experiment, revealing the interface reaction and microcosmic mechanism inducing interfacial reaction, discussing the influence mechanism of interface reaction on interfacial bonding strength, confirming the microcosmic essence affecting the interfacial mechanical behavior of Ti-6Al-4V coating produced by additive manufacturing. Above studies can be rationally used to improve the mechanical property of additive manufacturing Ti-6Al-4V alloy.