PROCESS OF BONDING MOLTEN METAL TO PREFORM WITHOUT INTERFACIAL ALLOY FORMATION

摘要

A unitary composite metal article formed of two dissimilar metals and the process for making the same by heating a substrate metal to a bonding temperature which is below the melting point of both the substrate and the casting metal; bringing the heated substrate and the molten casting metal into contact in an article-forming mold in the absence of an oxidizing atmosphere until wetting and molecular adhesion at the interface has been attained; and establishing a rate of heat transfer between the molten casting metal and the solid substrate which will cause chilling and solidification of the casting metal at the interface before formation of an interfacial alloy can occur. The resulting composite article represents a molecular bond of the casting metal to the substrate at the interface and is free from any visible interfacial alloy stratum.