Abstract
Some mechanical properties of treated Ti-6Al-4V alloy such as micro hardness and ductility were investigated. Ti-6Al-4V-xNb (x = 1, 2 and 5 wt.%) alloys were produced. The influence of Nb contents on microstructure characteristics and mechanical properties showed that the addition of Nb in Ti-6Al-4V alloy persuaded the formation of new phase distributing at grain boundaries. When the Nb content increases from 0 wt% to 5 wt%, the existence of fine precipitates postponed dynamic recrystallization and refined dynamically recrystallized. The average grain size of treated titanium alloy decreased significantly from ∼20 to ∼5 µm as a function of Nb contents increasing from 0 to 5 wt%, which can be attributed to the greater number of recrystallization nucleation sites due to grain refinement of the billet. The addition of Nb simultaneously improved the microstructural homogeneity, hardness, and ductility of the extruded alloys. The significant increase of microhardness was mainly ascribed to refined microstructure and dynamic precipitates.
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