Effect of reverse β-to-ω transformation on twinning and martensitic transformation in a metastable β titanium alloy

Xiao, J.F.; Nie, Zhihua; Tan, Chengwen; Zhou, Gang; Chen, R.; Li, M.R.; Yu, Xiaodong; Zhao, Xiuchen; Song, Haizheng; Ye, W.J.; Lee, Y.T.

doi:10.1016/j.msea.2019.05.060

Cited by 36 publications

(8 citation statements)

References 50 publications

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“…The microstructure plays an important role in the mechanical properties of the material, and can be adjusted to improve mechanical properties of the material [ 12 , 13 , 14 ]. The strength and hardness of titanium alloys can be greatly improved using a supersaturated solid solution formed by solution treatment [ 15 , 16 ]. The dispersed phase can be precipitated by subsequent aging treatment to improve strengthening, and the plasticity and toughness can be improved at the same time [ 17 , 18 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aging Treatment on Microstructural Evolution and Mechanical Properties of the Electron Beam Cold Hearth Melting Ti-6Al-4V Alloy

Yin²,

Zhi-bin

et al. 2022

Materials

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Ti-6Al-4V (Ti64 or TC4) alloy is widely used in the industrial field. However, there have been few studies of the TC4 alloy melted by electron beam cold hearth melting (EBCHM) technology. Aging treatment has a considerable influence on the secondary α-phase in titanium alloys. Therefore, TC4 alloy melted by EBCHM technology was investigated in this study. The effect of different aging times on the microstructural evolution and mechanical properties of titanium alloy sheets was evaluated. The results showed that, with increase in aging time, the primary α-phase enlarged and grain globularization occurred. In addition, some transformed β-phases disappeared. The strength and Vickers hardness of the heat-treated sheets decreased, while the plasticity increased with increase in aging time, indicating that the mechanical properties developed with evolution of the microstructure. After aging at 560 °C for 2 h, the properties overall were optimal. The type of fracture of the samples was ductile fracture; the dimples became larger with increase in aging time. After heat treatment, the recrystallized nucleus, substructures and HAGBs increased, while the deformed structure and LAGBs decreased. Some grains had rotated following heat treatment, indicating that anisotropy was greatly reduced.

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Section: Introductionmentioning

confidence: 99%

Effect of Aging Treatment on Microstructural Evolution and Mechanical Properties of the Electron Beam Cold Hearth Melting Ti-6Al-4V Alloy

Yin²,

Zhi-bin

et al. 2022

Materials

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“…Revised e / a̅ versus Δ r̅ diagram considering the results of titanium alloys reported in previous findings. ,− ,− …”

Section: Results and Discussionmentioning

confidence: 91%

Revised Semiempirical Approach to Predict the Occurrence of Twinning in Titanium Alloys

et al. 2021

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A revised semiempirical approach, considering the average values of the valence electron to atom ratio ( e / a̅ ) and a difference in atomic radii of alloying element/s and the base element (Δ r̅ ), is proposed to predict the twin formation in titanium alloys. The revised e / a̅ versus Δ r̅ diagram is plotted, considering the reported results of 90 titanium alloys fabricated using various processing methods. A new twin/slip boundary has been plotted and recommended based on the revised e / a̅ versus Δ r̅ diagram. The conventional maximum limit reported for the twinning in titanium alloys is e / a̅ = 4.20; however, it has been found that twinning in titanium alloys is possible up to the e / a̅ of 4.30.

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“…Moreover, it was found that both {112}<111> and {332}<113> twinning systems can be present in β titanium alloys [ 35 , 36 ]. In terms of activation, it was found that, in stable β titanium alloys, the accommodation of the applied plastic strain is assured by the {112}<111> twinning, while, in metastable β titanium alloys, the {332}<113> twinning was a predominant mechanism [ 38 , 39 ].…”

Section: Resultsmentioning

confidence: 99%

{332}<113> and {112}<111> Twin Variant Activation during Cold-Rolling of a Ti-Nb-Zr-Ta-Sn-Fe Alloy

et al. 2022

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Deformation twinning is a phenomenon that causes local shear strain concentrations, with the material either experiencing elongation (and thus a tensile stress) or contraction (compressive stress) along the stress directions. Thus, in order to gauge the performance of the alloy better, it is imperative to predict the activation of twinning systems successfully. The present study investigates the effects of deformation by cold-rolling on the {332}<113> and {112}<111> twin variant activation in a Ti-30Nb-12Zr-5Ta-2Sn-1.25Fe (wt.%) (TNZTSF) alloy. The Ti-30Nb-12Zr-5Ta-2Sn-1.25Fe (wt.%) alloy was synthesized in a cold crucible induction levitation furnace, under an argon-controlled atmosphere, using high-purity elemental components. The TNZTSF alloy was cold-deformed by rolling, in one single step, with a total deformation degree (thickness reduction) of ε ≈ 1% (CR 1), ε ≈ 3% (CR 3), and ε ≈ 15% (CR 15). The microstructural investigations were carried out with the SEM-EBSD technique in order to determine the grain morphology, grain-size distribution, crystallographic orientation, accumulated strain-stress fields and Schmid Factor (SF) analysis, all necessary to identify the active twin variants. The EBSD data were processed using an MTEX Toolbox ver. 5.7.0 software package. The results indicated that the TNZTSF alloy’s initial microstructure consists of a homogeneous β-Ti single phase that exhibits equiaxed polyhedral grains and an average grain-size close to 71 μm. It was shown that even starting with a 1% total deformation degree, the microstructure shows the presence of the {332}<113> twinning (()[] active twin variant; Schmit factor SF = −0.487); at a 3% total deformation degree, one can notice the presence of primary and secondary twin variants within the same grain belonging to the same {332}<113> twinning system (()[] primary twin variant—SF = −0.460; ()[] secondary twin variant—SF = −0.451), while, at a 15% total deformation degree, besides the {332}<113> twinning system, one can notice the activation of the {112}<111> twinning system (()[] active twin variant—SF = −0.440). This study shows the {332}<113> and {112}<111> twinning variant activation during cold-deformation by rolling in the case of a Ti-30Nb-12Zr-5Ta-2Sn-1.25Fe (wt.%) (TNZTSF) alloy.

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Effect of reverse β-to-ω transformation on twinning and martensitic transformation in a metastable β titanium alloy

Cited by 36 publications

References 50 publications

Effect of Aging Treatment on Microstructural Evolution and Mechanical Properties of the Electron Beam Cold Hearth Melting Ti-6Al-4V Alloy

Effect of Aging Treatment on Microstructural Evolution and Mechanical Properties of the Electron Beam Cold Hearth Melting Ti-6Al-4V Alloy

Revised Semiempirical Approach to Predict the Occurrence of Twinning in Titanium Alloys

{332}<113> and {112}<111> Twin Variant Activation during Cold-Rolling of a Ti-Nb-Zr-Ta-Sn-Fe Alloy

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