J. Kim, S. Yoon, C. Lee, Hanyang University, Seoul, South Korea; H. Choi, H. Kim, Korea Institute of Industrial Techonology, Seoul, South Korea
Deformation behavior and mechanical properties of a Cu54Ni6Zr22Ti18 bulk metallic glass were investigated during and after kinetic spray coating. The bulk metallic glass feedstock particles were manufactured by the inert gas atomization and then they were sprayed onto mild steel substrates with changing the powder carrier gas temperature changing [room temperature, 450°C (within the supercooled liquid region), and 550°C (above crystallization temperature)]. According to the powder carrier gas temperature, phase composition of feedstock and as-sprayed BMG coatings was investigated using x-ray diffraction, differential scanning calorimetry, and transmitted electron microscopy. With increase the powder feeding temperature, it could be deduced that more intimate contacts were achieved through the decrease of porosity. However, crystallizations which seemed to be induced by the severe deformation and accumulated heat were observed at localized region and micro-hardness and bond strength were affected by the crystallization degree of as-sprayed coating.
