Effect of the distribution state of transition phase on the mechanical properties and failure mechanisms of the W–Mo–Cu alloy by tuning elements content

Forming a transition phase (TP) layer between W and Cu phase can significantly improve the ductility of the W–Mo–Cu alloy. But, how the elements content affects the microstructure and mechanical properties of the W–Mo–Cu alloy is still unknow. In present work, to investigate these effects in detail, the W–Mo–Cu alloys with different TP layer structure were fabricated by the infiltration method by changing W and Mo content. The effects of distribution state of TP on the mechanical properties, deformation behavior and failure mechanisms of W–Mo–Cu alloys in tensile and compressive process at different temperature were investigated. The results suggest that by increasing Mo content, TP layer structure transforms from semi-continuous to completely coated network, leading to the high ductility of W–Mo–Cu alloy. Additionally, as compared to weak interfacial bonding between W and Cu interfaces, formation of TP layer can increase the interfacial strength then to significantly improve ductility and tensile strength. The effect of the TP layer structure induced by Mo content on the deformation behavior and failure mechanism of the W–Mo–Cu alloy are also discussed.