Journal of Welding and Joining

: Journal of KWJS. 2007;25(3):37-44. Published online July 19, 2007.; Effect of Thermal Energy of In-Flight Particles on Impacting Behavior for NiTiZrSiSn Bulk Metallic Glass during Kinetic Spraying; Sanghoon Yoon, Sooki Kim, Changhee Lee

Abstract: Mechanical and thermomechanical properties of the bulk metallic glass (BMG) are so unique that the deformation behavior is largely dependent on the temperature and the strain rate. Impacting behavior of NiTiZrSiSn bulk metallic glass powder during kinetic spraying was investigated in this study. Considering the impact behavior of the BMG, the kinetic spraying system was modified and attached the powder preheating system to make the transition from the inhomogeneous deformation to the homogeneous deformation of impacting BMG particle easy. BMG splat formation is considered from the viewpoint of the adiabatic shear instability. It is suggested that the impact behavior of bulk metallic glass particle is determined by the competition between fracture and deformation. The bonding of the impacting NiTiZrSiSn bulk amorphous particle was primarily caused by the temperature-dependent deformation and fracture (local liquid formation) behavior.

Keywords :NiTiZrSiSn bulk amorphous powder;Kinetic spraying;Impact behavior;Adiabatic shear instability