Accommodation mechanisms in strain-transformable titanium alloys

Danard, Yolaine; Martin, Guilhem; Lilensten, Lola; Sun, Fan; Seret, Anthony; Poulain, Régis; Mantri, S.A.; Guillou, Raphaëlle; Thiaudière, Dominique; Thüngen, I. Freiherr von; Galy, D.; Piellard, Michaël; Bozzolo, Nathalie; Banerjee, Rajarshi; Prima, Frédéric

doi:10.1016/j.msea.2021.141437

Cited by 29 publications

(12 citation statements)

References 42 publications

(77 reference statements)

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“…[62,63] However, this assertation is in contradiction to the conclusions made by Lai et al and Castany et al, [9,30] who argued that the formation α 00 precedes {332} 113 h itwinning in Ti-Nb alloys. [29,30] and to the findings in the previous studies [46,47] assuming simultaneously-activated stress-induced α 00 and β twin at the onset of plastic deformation in Ti-Mo alloys. Contrarily, the evidence of detwinning of α 00 martensite without changes in its amount on load removal in Ti-12Mo alloy was presented recently, [64] which does not support the transformation of {130} 310 h i α 00 deformation twins to {332} 113 h i twins pathway on unloading.…”

Section: Ebsd and Tem Studiessupporting

confidence: 70%

“…The Mo Eq of the studied Ti-1033 alloy was calculated to be 10.67, raising the expectation for higher bending strength in this material as many metastable β-phase Ti-alloys have demonstrated an excellent combination of toughness and strength. [31,45,46] To serve as an example, the bending strength of Ti-9Mo (Mo Eq = 9) and Ti-10Mo (Mo Eq = 10) are 1500 and 1700 MPa, respectively. [44] The low plasticity reflected by the small bending deflection prior to fracture and the absence of double yielding in the studied material (Figure 2) is attributed to the presence of voids in the microstructure carried over from the sintering stage.…”

Section: Three-point Bendingmentioning

confidence: 99%

“…[12] The deformation products in a hierarchical structure are categorized as 1) those activated as a response to external stress and 2) those forming to accommodate the internal strains arising from the formation of primary deformation products. [46] Danard et al [46] nominated α 00 and ω D , and secondary twinning as the main candidates for the latter group. Combined TEM and EBSD studies in the present work showed that the f332g〈113〉 twins are the primary deformation-induced products in the microstructure of the deformed samples followed by the formation of α 00 plates in the remaining β and the secondary α 00 plates inside the twinned β.…”

Section: Ebsd and Tem Studiesmentioning

confidence: 99%

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An Investigation into the Microstructural Response to Flexural Stresses of a Metastable β‐Phase Ti Alloy produced by Blended Elemental Powder Metallurgy

et al. 2023

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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.

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Section: Ebsd and Tem Studiessupporting

confidence: 70%

Section: Three-point Bendingmentioning

confidence: 99%

Section: Ebsd and Tem Studiesmentioning

confidence: 99%

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An Investigation into the Microstructural Response to Flexural Stresses of a Metastable β‐Phase Ti Alloy produced by Blended Elemental Powder Metallurgy

et al. 2023

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“…However, with thermomechanical processing and, implicitly, cold-rolling, comes the propensity for deformation twining. Indeed, it was observed that the formation of twins is closely correlated with a high strain-hardening rate [ 9 ]. Generally, twinning can be defined with the help of a unit sphere and the pair { K }< η >, where K represents the twinning plane which intersects the sphere on η , the twinning/shear direction [ 10 ].…”

Section: Introductionmentioning

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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“…To overcome such limitations, βmetastable Ti-alloys showing good strength-ductility trade-off with large work-hardening rates thanks to the TRIP/TWIP effects have been developed, see e.g. [19][20][21]. Binary Ti-Mo alloys have been proven promising candidates with the TRIP/TWIP Ti-12Mo [20,[22][23][24] and the TWIP Ti-15Mo alloy [25].…”

mentioning

confidence: 99%

Stabilizing post-yielding behavior of a stretching dominated lattice structure through microstructural optimization

et al. 2022

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Accommodation mechanisms in strain-transformable titanium alloys

Cited by 29 publications

References 42 publications

An Investigation into the Microstructural Response to Flexural Stresses of a Metastable β‐Phase Ti Alloy produced by Blended Elemental Powder Metallurgy

An Investigation into the Microstructural Response to Flexural Stresses of a Metastable β‐Phase Ti Alloy produced by Blended Elemental Powder Metallurgy

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

Stabilizing post-yielding behavior of a stretching dominated lattice structure through microstructural optimization

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