Abstract
The present study evaluated the β recrystallization behavior and deformation microtexture evolution of TB6 titanium alloy (Ti-10V-2Fe-3Al) taking place during isothermal compression. The hot deformation tests were carried out in the temperature range below the β phase transition temperature and spanned a wide strain rate range of 0.0001~1 s−1. Microstructure evolution on β phase, including its recrystallization behavior and microtexture formation, is sensitive to the strain rates, whereas the average grain size of equiaxed α phase exhibits a slight increase with the strain rate decreasing. Moreover, β recrystallization is not homogeneous among the prior β grains, and is characterized by: (I) enriched β sub-grains, (II) sporadically or chain-like distributed recrystallized β grains with a grain size far less than the prior β grains, and (III) wave-shaped β grain boundaries. The β recrystallization is inadequate and its orientation takes on the inheritance characteristic, which makes the β microtexture significant after deformation. At a lower strain rate, the high activity of the {11−2}<111> and {12−3}<111> slip systems induced the crystal rotation around <101>, but such crystal rotation did not destroy the Burgers orientation relationship (BOR), which could be accounted for by the generation of a strong microtexture of <001>//RD. The divergences on β recrystallization fraction, the operation of slip systems, and initial crystal orientations explain the different microtexture components with varied intensities under different deformation conditions.
Highlights
Near β titanium alloy serves as an important structural material with high strength, low weight, and excellent corrosion resistance, and these important property features make the material one of the most potential candidates for wide application in various fields such as aerospace, automotive, and weaponry and equipment industries [1,2,3,4]
CoAnctl0u.s0i0o0n1s s−1, the operation of the {11−2} and {12−3} slip systems induceTdhtihserecsreyasrtcahl rfooctautsioesnoanrotuhendβ-e,ebvuotlustuiocnh cchryasrtaaclterroitsatitciosnofdTidB6notittadneisutmroyaltlohye during (α + β) dual-phase field isothermal compression, which was undertaken by the electron backscatter diffraction technique
This research focuses on the β-phase evolution characteristics of TB6 titanium alloy during (α + β) dual-phase field isothermal compression, which was undertaken by the electron backscatter diffraction technique
Summary
Near β titanium alloy serves as an important structural material with high strength, low weight, and excellent corrosion resistance, and these important property features make the material one of the most potential candidates for wide application in various fields such as aerospace, automotive, and weaponry and equipment industries [1,2,3,4]. Compared with other materials with high performance, it shows significant advantages on strength, corrosion resistance, biocompatibility, and formability [3,5,6,7]. The required mechanical properties can be directionally modulated during hot working by means of the sensibility of microstructure evolution on processing variables [9,10,11], yielding a desirable Ti-alloy product with minimal scrap. A comprehensive and profound understanding of the behavior and intrinsic mechanisms of the microstructure transformation and crystallographic texture evolution that determine the performance of products is a prerequisite for working out the proper processing craft route
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