Interfacial failure mechanism in tungsten fiber reinforced copper-based composites fabricated by combustion synthesis melt infiltration under ultra-high gravity

摘要

Tungsten fiber reinforced copper-based composites were successfully fabricated by a new method called combustion synthesis melt infiltration under ultra-high gravity. Between the tungsten fibers and the copper matrix, an interlayer consisting of W_(18)O_(49) needles was observed at the surface of the pickled tungsten fibers. The inter-facial strength was measured by the push-out test. For the tungsten fibers with a WO_3 surface layer, the failure happened at the interface between the WO_3 layer and the copper matrix by the debonding failure mechanism. For the case with the formation of a W_(18)O_(49) interlayer, the failure happened at the interface between the W_(18)O_(49) interlayer and tungsten fibers by the brittle failure model, which improved the interfacial strength.