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

SUN Yu-xin FU Yan-shu WANG Xiao-ping(1.National Key Laboratory of Transient Physics,Nanjing University of ScienceTechnology,Nanjing 210094,Jiangsu,China;2.Department of Modern Mechanics,University of Science and Technology of China,Hefei 230026,Anhui,China)  
A new method of coating another metals at the interfaces of amorphous foils before explo- sive 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 in- terfaces of the uncaoted and coated Fe_(78)B_(13)Si_9 amorphous foils with the thickness of 30μm.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 dis- tributing curves show as follows:(1) in the coated system,the energy of plastic collision is concen- trated 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.
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