Strengthening mechanism of Ti-W composites with heterogeneous microstructures

Heterogeneous Ti-W metal–metal composites were designed in this study. The effects of W particles on microstructural evolution and strengthening mechanisms were investigated. There was slight diffusion between W particles and Ti matrix. After hot-and-cold rolling, the composites can form high-density hetero-structures. The heterogeneous composites exhibit a better strength-ductility combination, compared with the traditional titanium-matrix composites with uniformly distributed ceramic particles. The hetero-deformation-induced (HDI) strengthening was analyzed, and a new interface stress model was proposed to evaluate the HDI stress. The HDI stress values obtained from the new interface stress model agreed better with the experimental results than the traditional method.