Effect of surface oxide in cold spray with the material point simulations
Cold spray is a technique utilizing the plastic deformation of materials under impact to achieve solid-state bonding between metals.It has great importance for engineering applications such as surface repair,preparation of special mat erials,and additive manufacturing.The oxide on the raw materials is one of the major factors influencing the bonding efficiency and adhesive strength in cold spray.The effects of the oxide on the bonding between the particle and substrate are investigated with the simulation of material point method.The volume ratio of extreme plastic deformation zone in the particle is defined.Based on the residue of oxides at the interface and the aforementioned definition,the conclusions of the effect on the contact area and the plastic deformation under various impact velocities are drawn.Under the existence of oxides,increasing the impact velocity of the particle can simultaneously enlarge the fresh metallic surface and increase the plastic deformation.
cold sprayoxidematerial point methodadditive manufacturing
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