Deformation and mechanical properties of Ti-based metallic glassy composites at various temperature and strain rate

The mechanical properties and deformation behavior of Ti-based metallic glassy composites (MGCs) consisting of a glassy matrix and reinforcing dendrites of body-centered-cubic structure were investigated in the supercooled liquid region at various strain rates. Experimental results show that the yield strength of MGCs increases with the increase of the size and volume fraction of the dendrite, the increase of strain rate, or/and the decrease of temperature. Moreover, the MGCs exhibit not only homogeneous deformation characters of the glassy matrix but also work-hardening of the crystalline dendrite phase. The strain rate sensitivity and strain hardening exponent are employed to analyze quantitatively the roles of the constituents in influencing the deformation and performance during uniform deformation. The deformation mechanism is dependent of different deformation stages, which related with high density dislocations within the dendrite phase, good homogeneous flow of glassy matrix and well interface.