Influences of coating materials on temperature of amorphous foils during explosive welding

A new method of coating another metals at the interfaces of amorphous foils before explosive welding was propsoed to explore the influences of coating materials on temperature of amorphous foils during explosive welding. The coated amorphous foils were simplified as homogeneous materials by scaling the heat-conduction coefficient to analyze the temperature field at the explosive welding interfaces of the uncaoted and coated Fe78B13Si9 amorphous foils with the thickness of 30 m. Combined with the square wave model of the temperature field, a one-dimensional heat-conduction equation was developed and the initial and boundary conditions were obtained. Comparisons of the temperature distributing curves show as follows: (1) in the coated system, the energy of plastic collision is concentrated in the coating layer and the heat-affected zone can be remarkably minimized; (2) the average temperature rise in the coated systems is about 280 K lower than that in the uncoated system; (3) the cooling rate after plating copper is up to 107 K/s. Researched results indicate that the Fe-based bulk metallic glasses in the coated amorphous foils can be protected and the explosive welding windows are effectively enlarged.