采用有限元数值计算方法研究了冷喷涂过程中Cu, Al及Ni合金和Ti合金颗粒与Cu基板的碰撞变形行为, 探讨了颗粒的材料特性对其碰撞基板后的变形行为和结合行为的影响. 结果表明, 与基板相比,有效塑性极限大于衬底的金属颗粒易发生绝热剪切失稳, 此时, 基板不发生失稳, 并释放积攒的变形能,使颗粒发生回弹现象. 有效塑性极限小于衬底的金属颗粒不发生绝热剪切失稳, 其积攒的变形能在碰撞后期释放, 促进了基板的失稳.
The deformation behavior of Cu, Al, Ti alloy and Ni alloy particles upon Cu substrates in cold spraying was studied using the finite element analysis, and effect of material properties of cold-sprayed particles on its impacting behavior. The results indicated that, compared to the substrate, particles with higher effective plastic limit were inclined to undergo adiabatic shear instability. The substrate without adiabatic shear instability released deformation energy, which lead to rebound of particles. Adiabatic shear instability wasn’t observed in particles with lower effective plastic limit, and the release of the deformation energy promoted the adiabatic shear instability of substrate.
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