Revealing Microstructural, Textural, and Hardness Evolution of Ti–6Al–4V Sheet Cooled From Sub β-Transus Temperature at Different Rates

Crystallographic Features of Phase Transformations during the Continuous Cooling of a Ti6Al4V Alloy from the Single-Phase β-Region

“…The α/α-misorientation angle distribution was essentially discrete and rather similar for all cooling rates. The spectrum of the misorientation angle distribution for any mechanism of β→α transformation points to the limited possibilities of α-phase variant selection, which was noted earlier in [ 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 ]. Note that according to [ 42 ], lamellar structures are observed when the structure is formed by the shear mechanism.…”

“…Ti-6Al-4V is a typical (α+β)-titanium alloy widely used in the aerospace, marine, chemical, and biomedical industries due to its high strength-to-weight ratio, good corrosion resistance and excellent stability of mechanical properties [ 1 , 2 , 3 ]. It frequently serves as a model alloy, i.e., to establish the effect of processing parameters, e.g., thermomechanical processing [ 4 ] and additive manufacturing [ 5 ] on structure evolution.…”

“…Moreover, a number of studies have shown the effect of phase transformation paths [ 10 , 18 , 36 ], thermo- and thermomechanical processing [ 37 , 38 , 39 ], and chemical composition [ 40 ] on α/α grain boundary network characteristics (misorientation angle, plane orientation, population, connectivity) and on α precipitation mechanisms. Particularly, diffusion and shear are the two generally accepted phase transformation mechanisms in titanium alloys, which are usually controlled by varying the cooling rates from the single β-state [ 3 ] or (α + β)-field [ 41 ]. Higher cooling rates result in the shear mechanism; a slower cooling rate results in diffusion or a diffusion-assisted mechanism.…”