A metastable-β titanium alloy, Ti-10V-3Fe-3Al (wt. %), was subjected to thermo-mechanical processing including the compression test at 725 • C, which is below the β transus temperature (780 • C), and at strain rate of 10 −3 s −1 . The presence of phases was determined using transmission electron microscopy and X-ray diffraction. Although the dynamic recovery took place together with slip, both deformation-induced α" martensite and ω were detected as other operating mechanisms for the first time in metastable-β titanium alloy deformed in α + β region. The volume fraction of stress-induced α" was higher than that of the same alloy deformed at room temperature due to a higher strain applied. Stress-induced twinning was not operational, which could be related to the priority of slip mechanism at high temperature resulted from thermally-assisted nucleation and lateral migration of kink-pairs.
A Ti‐10V‐3Al‐3Fe metastable β Ti alloy is strained under three‐point bending conditions according to the ASTM E290‐14 standard. A combination of electron backscatter diffraction (EBSD) mapping and high‐resolution scanning transmission electron microscopy (STEM) is used to investigate the microstructural response to flexural stress. Results reveal a delayed formation of the deformation products, due to the load‐bearing capacity of the constituent voids. The deformation products are confined in narrow bands on either side of the fracture surface. {332}⟨113⟩ twinning system is identified as the primary deformation mode followed by the formation of α″ martensite both in β matrix and β twins. Accommodation of the microscopic strain arising from the development of α″ structure and β‐twinning triggers the formation of fine deformation‐induced ω plates, which are observed predominantly at the interfacial plane of β/β
twin and β/α″, and also in the interior of the β twins.
A metastable β-Ti alloy, Ti-10V-3Fe-3Al (wt.%), was subjected to thermos-mechanical
17processing including the compression test at 725°C, which is below the β transus temperature 18 (780°C), and at strain rate of 10 -3 s -1 . The presence of phases was determined using transmission 19 electron microscopy and X-ray diffraction. Although the dynamic recovery took place together with 20 slip, both deformation-induced α˝ martensite and ω were detected as other operating mechanisms 21 for the first time in metastable-β Ti alloys deformed in α+β region. The volume fraction of stress-
22induced α˝ was higher than that of the same alloy deformed at room temperature due to higher 23 strain applied. Stress-induced twinning was not operational, which could be related to the priority 24 of slip mechanism at high temperature resulted from thermally-assisted nucleation and lateral 25 migration of kink-pairs.
26Keywords: metastable Ti alloy; high temperature deformation; stress-induced ω; stress-induced α˝ 27 martensite; transmission electron microscopy; slip; X-ray diffraction. 28 29
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