Equiaxed α microstructure evolution in wrought Ti-10Al-1Zr-1Mo-1Nb alloy during annealing

Tanii, Shintaro; Umezawa, Osamu; Yamabe‐Mitarai, Yoko

doi:10.1016/j.jallcom.2020.157184

Cited by 4 publications

(1 citation statement)

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“…Through a series of heat treatment and hot working, the microstructure of metastable β titanium alloys can be tailored to achieve the matching of high strength and well plasticity [4,5]. Compared with several typical microstructures, it is found that the equiaxed microstructure can help the alloys to achieve the above objective to the greatest extent [6]. Therefore, better understanding of the dependence of mechanical property and deformation capacity on the equiaxed microstructure is the key to improve the formability and service life of the alloys.…”

Section: Introductionmentioning

confidence: 99%

In-Situ Study on Tensile Deformation and Fracture Mechanisms of Metastable β Titanium Alloy with Equiaxed Microstructure

et al. 2022

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Understanding the mechanisms of deformation and fracture of metastable β titanium alloys is of great significance for improving formability and service life. By combining the in-situ tensile test, TEM characterization and EBSD analysis, the tensile deformation behavior, activation of slip systems, crack initiation, and propagation of a high strength metastable β titanium alloy (Ti-5Cr-4Al-4Zr-3Mo-2W-0.8Fe) with equiaxed microstructure are investigated. The equiaxed microstructure is composed of primary α (αp) phase, transformed β (βt) matrix phase, and secondary α (αs) phase. In contrast to the hexagonal αp grain with limited slip systems, the body-centered βt matrix has more slip systems, however the hindering effect of αs phases on dislocation slip leads to the different deformability of the αp phase and βt matrix. The equiaxed αp grains are more prone to deformation and rotation to coordinate the overall deformation. The shear band leads to the formation of sub-grain boundary and even the fragmentation of αp grains. As a result, the microvoids tend to nucleate at the grain boundary, phase interface, slip band, and shear band. The inhomogeneous deformation in the plastic deformation zone around the crack tip is the primary cause of damage. The crack propagation caused by microvoids coalescence advances along the grain boundaries and phase interfaces in the form of intergranular, and along the activated slip systems and shear bands in the form of transgranular. Pinpointing the situation in the equiaxed microstructure and combining that in other typical microstructures will help to summarize the universal deformation and fracture mechanisms of metastable β titanium alloy, and provide a basis for alloy design and microstructure tailoring.

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Section: Introductionmentioning

confidence: 99%