Numerical Simulation on Cold Spray Deposition Behavior of Ti-Al Mixed Particles

The coupled Euler-Lagrange three-quarter model of cold spraying Ti-Al mixed particles with different particle size on 7B04 aluminum alloy matrix was established by using the ABAQUS software. The deposition morphology, residual stress and porosity at different matrix temperatures (400, 500, 600 K) were studied. The results show that under the matrix temperature of 500 K, the titanium particles of sediment were mainly concentrated in the middle and upper regions, while the aluminum particles were mainly concentrated in the middle and lower regions. The tensile and deformation of the aluminum particles were significant, the equivalent plastic strain was relatively large and the equivalent stress was relatively small. At high matrix temperatures, the deformation of the matrix surface was significant. At different matrix temperatures, the sediments were mainly presented residual compressive stress, the residual compressive stress in the periphery was greater than that in the middle. When the matrix temperature was 500 K,the maximum residual compressive stress and its depth was the smallest. At different matrix temperatures, the porosity of sediments was low. The pores mainly existed at the bonding interfaces between particles. With the increase of matrix temperature, the porosity of sediments decreased slightly.