Microstructure and mechanical properties evolution of Ti-13Nb-13Zr alloy processed by ECAP-Conform and rotary swaging

摘要: The evolution of the microstructure and properties of Ti-13 Nb-13Zr alloy was investigated for the materials states ranging from the solution treated (ST) state over the continuous equal channel angular pressing (ECAP-Conform) state to the states of the materials processed by combination of ECAP-Conform with rotary swaging (RS) multilevel deformation. In order to investigate microstructure features and mechanical properties for all considered material states, SEM, TEM, XRD and tensile and hardness tests were employed. The two-dimensional mismatch between α′, β, and α phases was calculated to evaluate the effect of the precipitation of the second phase. The results indicate that the microstructure of Ti-13 Nb-13Zr alloy transformed into majority of α′ martensite and a small percentage of residual metastable βm phase after ST. The grains were significantly refined, and a small part of α phase was …