On the heterogeneous nature of deformation in a strain-transformable beta metastable Ti-V-Cr-Al alloy

Lilensten, Lola; Danard, Yolaine; Brozek, C.; Mantri, S.A.; Castany, Philippe; Gloriant, T.; Vermaut, P.; Sun, Fan; Banerjee, Rajarshi; Prima, Frédéric

doi:10.1016/j.actamat.2018.10.003

Cited by 103 publications

(72 citation statements)

References 34 publications

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“…It can be noted that the measured elastic moduli are very similar between the two alloys, and hence their shear moduli should be similar as well. Both alloys display classical (and similar in shape) TRIP/TWIP stress-strain tensile curves with several apparent successive stages, namely, the more or less marked plateau from their plastic threshold to ε ≈ 0.1, followed by a strain-hardening increase, presumably associated to the α" transformation as reported elsewhere (Miyazaki et al, 1981;Lilensten et al, 2019) and finally a smooth and stable decrease up to fracture. It is worth noting that the role of α stress-induced precipitation in the overall shape of the strain-hardening profile is actually far to be negligible.…”

Section: Mechanical Properties and Initial Microstructuressupporting

confidence: 62%

“…For a few years, strain-transformable titanium alloys have attracted a lot of attention, thanks to their specific mechanical properties, allowing a breakthrough from usual β-metastable titanium alloys mechanical properties (Marteleur et al, 2012;Sun et al, 2013;Brozek et al, 2016;Gao et al, 2018;Ren et al, 2018;Sadeghpour et al, 2018;Lilensten et al, 2019). The combination of Transformation Induced Plasticity (TRIP) and Twinning Induced Plasticity (TWIP) effects is now known to lead to a drastic improvement of both strain-hardening and ductility compared to "classical" titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

“…The occurrence of the TRIP and/or TWIP effects in Ti-alloys depends on the chemical stability of the β-phase, which is influenced by the alloying elements and the grain orientation depending on the tensile axis. Indeed, Lilensten et al (2019) showed that the main deformation mechanism in a grain can be predicted by the Schmid factor calculation. So far, most of the design strategies for TRIP/TWIP titanium alloys have been almost exclusively based on the "delectron"-guided approach using the Bo-Md (where Bo stands for average bond order and Md for average d-orbital energy) method in order to predict the β-phase chemical stability (Abdel-Hady et al, 2006).…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

et al. 2020

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Transformation Induced Plasticity and Twinning Induced Plasticity (TWIP) titanium alloys are well-known to display a good combination of strain-hardenability and ductility. However, a large range of strain-hardening rates, which cannot be predicted by the actual design method based on electronic parameters, is obtained. In order to explain this wide range of properties, two different alloys displaying a large difference of strain-hardening rates, but similar chemical stability, have been studied and compared: Ti-12Mo and Ti-8.5Cr-1.5Sn (in wt%). Evolution of both twin size and density during in situ tensile tests has been followed by SEM/electron backscatter diffraction mapping, and two distinct behaviors can be highlighted: the growth of existing twins (Ti-12Mo) and the nucleation of new twins (Ti-8.5Cr-1.5Sn) upon loading. The last one may lead to an improvement of the dynamic Hall-Petch effect by multiplication of twin/matrix interfaces, with subsequent improvement of the macroscopic strain-hardening. It is thought that this competition may be related to the crystal lattice distortion induced by the alloying elements and the subsequent reduction of the migration velocity of the twin/matrix interfaces. Impact Statement: This work reports on distinct behaviors of mechanical twins in TRIP/TWIP titanium alloys, highlighting for the first time a competition between growth of existing twins and nucleation of additional twins upon loading. This effect is assumed to be due to the solute-strengthening effect in the studied alloys and modify, as a consequence, the strain-hardenability of the TRIP/TWIP alloys.

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Section: Mechanical Properties and Initial Microstructuressupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

et al. 2020

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“…The hierarchical 332T twinning shows an auto-accommodated microstructure at each twinning level. It suggests that this hierarchical twinning mechanism can be comparable to the hierarchical microstructure reported in TRIP/TWIP Ti-Mo and Ti-V-Cr-Al alloy, in which 2 nd martensite formed in the 1st 332T plays the role of accommodation to the local strain misfit [1,5]. In another Ti-Mo-Zr alloy with higher Zr content (Ti-13Mo-18Zr), this hierarchical twinning mechanism has also been observed as one of the accommodation mechanisms in addition to the {5 8 11}-type twinning at 332T boundaries [4].…”

supporting

confidence: 64%

“…The synergetic cooperation of these two mechanisms is thought to be one of the reasons for the macroscopic tolerance to strain localization. Analogous to the Ti-alloys operating in TWIP/TRIP [1,5], similar synergy may exist between twinning and martensitic transformation, which play roles for strain-hardening and for strain misfit accommodation, respectively. As a result, these alloys also present very stable plastic flow accompanied by strong strain hardening effect.…”

mentioning

confidence: 99%

Hierarchical {332}<113> twinning in a metastable β Ti-alloy showing tolerance to strain localization

Zhang

et al. 2020

Materials Research Letters

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A hierarchical {332} < 113 > twinning system is studied in a metastable beta Ti-12Mo-10Zr (wt%) alloy, which shows strong twinning-induced plasticity (TWIP) effect due to a three-level twinning mechanism. In-situ digital image correlation (DIC) indicates a good tolerance to strain localization until max = 0.4 thanks to TWIP hardening effect. The local shear misfit due to the intersection between the matrix slip bands and the primary twin boundaries is accommodated by the formation of secondary and tertiary sub-twinning structures. The strain accommodation postpones crack nucleation at the slip-twin intersections, contributing to the high tolerance of the strain localization. IMPACT STATEMENT The metastable Ti-12Mo-10Zr alloy displays a high tolerance to strain localization in tension thanks to the dynamic strain-hardening effect and local strain accommodation by the hierarchically selforganized triple {332} < 113 > deformation twinning.

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Effect of Primary α Phase on the Plastic Deformation Mechanism of Ti–10Mo–1Fe Alloys at Room Temperature

et al. 2021

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Through room‐temperature compression tests, the microstructure evolution and room‐temperature plastic deformation mechanism of a β‐type Ti–10Mo–1Fe alloy, which exhibits a primary α phase after solution treatment at 780 °C, are studied. When the deformation is small, the existence of the primary α phase makes the distribution of twins between grains uneven. A small amount of intragranular twins grows to the intragranular α phase, and then stops growing. The grain boundary α phase (GBα) plays an important role in inhibiting the growth of twin laths to a certain extent. When the deformation is large, compression cracks appear at the α/β phase interface. The α/β phase interface is weak, and the deformation along the 45° direction is relatively large. Owing to the existence of the primary α phase, the ultimate tensile strength of the alloy increases to 934.5 MPa, and the elongation reaches 21.7%. The room‐temperature plastic deformation mechanism of the Ti‐10Mo‐1Fe alloy solution treated at 780 °C is dominated by {332} <113> twins, as well as by a small amount of {112} <111> twins (0.57%) and stress‐induced orthorhombic martensite α” phase (2.5%).

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On the heterogeneous nature of deformation in a strain-transformable beta metastable Ti-V-Cr-Al alloy

Cited by 103 publications

References 34 publications

The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

The Influence of Twinning on the Strain–Hardenability in TRIP/TWIP Titanium Alloys: Role of Solute–Solution Strengthening

Hierarchical {332}<113> twinning in a metastable β Ti-alloy showing tolerance to strain localization

Effect of Primary α Phase on the Plastic Deformation Mechanism of Ti–10Mo–1Fe Alloys at Room Temperature

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