Abstract
Stress-induced transformations in retained metastable phase are known deformation mechanisms that provide additional plasticity in several alloy systems. In the present study on metastable β Ti-10V-2Fe-3Al (Ti-1023) and Ti-5Al-5V-5Mo-3Cr (Ti-5553) alloys, stress-induced martensitic transformation (SIMT) has been effectively demonstrated to result in achieving a noticeable cold reduction of ∼43% and ∼45%, respectively. A significant fraction of stress-induced α″ martensites provide preferential nucleation sites for new strain-free grains formation upon recrystallization annealing. The thermomechanical treatment resulted in grain refinement by ∼93% and ∼80%, respectively, for Ti-1023 and Ti-5553 alloys. Electron Probe Micro Analyzer (EPMA) confirms the role of alloying element (such as Fe, Mo, V, Cr and Al) diffusivities resulting in altering the stability of the β phase as a function of recrystallization annealing time. Further, the effect of grain size on the SIMT ability based on microhardness variations has been deduced.
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