Investigation on Synergistic Deformation and Microstructure Evolution of Non-alloyed Ti/Mg Composites

In this work, non-alloyed Ti/Mg composites were prepared by powder metallurgy, and the strength, ductility and elastic modulus of the composites were enhanced simultaneously. The synergistic effect of Ti content on the microstructure evolution, mechanical properties and deformation behavior of the composite was investigated. The results show that the dynamic recrystallization (DRX) content of the composites increases with the increase of Ti content. Recrystallization causes grain refinement and texture weakening of the composites, which reduces the stress accumulation of the composites. The yield strength, tensile strength and elongation of 10 wt.% Ti/Mg composites reached 195.1 MPa, 300.9 MPa and 14.7%, respectively, which were 42.6%, 57.5% and 11.4% higher than those of Mg matrix. The strength improvement comes from grain refinement, grain boundary pinning and excellent interface bonding. The ductility improvement was attributed to the weakening of texture, the weakening of dislocation density and the synergistic effect of Ti particles.