Deformation twinning-induced single-variant ω-plates in metastable β-Ti alloys containing athermal ω-precipitates

Chen, Wei; Li, Keer; Yu, Guoxiang; Ren, Junqiang; Zha, You; Sun, Jun

doi:10.1007/s10853-020-05706-z

Cited by 14 publications

(3 citation statements)

References 64 publications

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“…After 50, 75, and 90 % cold rolling, the alloy shows a three-phase structure of α + β + ω str . The generation of α and ω str was related to the stress--induced transformation (β → α + ω str ) [24,[40][41][42][43]. The phases and phase volume fractions of alloys under various processing conditions are listed in Table 2.…”

Section: Phase Structurementioning

confidence: 99%

Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

Hsu¹,

Wong²,

Chen³

et al. 2021

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In this work, different thermomechanical treatment conditions were used to improve the mechanical performances of Ti-25Nb-8Sn. During cold rolling treatment (50, 75, and 90 %), as-cast Ti-25Nb-8Sn underwent a stress-induced phase transformation from a single β phase to a three-phase structure of α + β + ωstr. After the subsequent aging treatment, Ti-25Nb--8Sn presents three-phase β + α + ωiso (at 250 and 400 • C, for 30 min) and two-phase β + α (at 600 • C, for 30 min). At lower aging temperatures (250 and 400 • C), yield strength/modulus (× 1000) ratios of Ti-25Nb-8Sn are dramatically improved with a maximum increase of 143 %, from 9.06 (as-cast) to 16.2-22.0. Under various thermomechanical treatment conditions in this study, the results show that Ti-25Nb-8Sn has excellent yield strength/modulus (× 1000) ratio (∼ 22) and corrosion resistance after 90 % cold rolling and subsequent aging treatment at 250 and 400 • C for 30 min. K e y w o r d s : titanium alloys, biomaterials, cold working, aging, hardness

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Section: Phase Structurementioning

confidence: 99%

Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

Hsu¹,

Wong²,

Chen³

et al. 2021

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“…It has been frequently observed that the ω ath phase fully vanished following the formation of stress-induced α ′ martensite or α ′′ martensite [5,8,16,22], while the disappearance of one variant of the ω ath phase particles was usually observed after the formation of the {332} β and {112} β deformation twinning [7,14,92]. The presence of the dense ω ath phase disrupts the continuance of the β matrix, acting as a strong obstacle to stress-induced phase transformation and deformation twinning of the β matrix.…”

Section: Role Of ω Phase 241 Effect Of ω Phase On Stress-induced Mart...mentioning

confidence: 99%

A Review of Deformation Mechanisms, Compositional Design, and Development of Titanium Alloys with Transformation-Induced Plasticity and Twinning-Induced Plasticity Effects

Fu,

Gao,

Jiang

et al. 2024

Metals

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Metastable β-type Ti alloys that undergo stress-induced martensitic transformation and/or deformation twinning mechanisms have the potential to simultaneously enhance strength and ductility through the transformation-induced plasticity effect (TRIP) and twinning-induced plasticity (TWIP) effect. These TRIP/TWIP Ti alloys represent a new generation of strain hardenable Ti alloys, holding great promise for structural applications. Nonetheless, the relatively low yield strength is the main factor limiting the practical applications of TRIP/TWIP Ti alloys. The intricate interplay among chemical compositions, deformation mechanisms, and mechanical properties in TRIP/TWIP Ti alloys poses a challenge for the development of new TRIP/TWIP Ti alloys. This review delves into the understanding of deformation mechanisms and strain hardening behavior of TRIP/TWIP Ti alloys and summarizes the role of β phase stability, α″ martensite, α′ martensite, and ω phase on the TRIP/TWIP effects. This is followed by the introduction of compositional design strategies that empower the precise design of new TRIP/TWIP Ti alloys through multi-element alloying. Then, the recent development of TRIP/TWIP Ti alloys and the strengthening strategies to enhance their yield strength while preserving high-strain hardening capability are summarized. Finally, future prospects and suggestions for the continued design and development of high-performance TRIP/TWIP Ti alloys are highlighted.

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“…One more example is the ω-Ti phase formation in the β-Ti alloy. It was found that the formation of isothermal ω in the Ti–Nb alloy could be suppressed by the addition of the third element Zr; meanwhile, it could also be promoted by deformation strain in the Ti–Cr alloy containing the athermal ω phase [ 13 ]. It is consequently necessary to differentiate the nature of the ω phase from an isothermal one to an athermal one by comparative study.…”

Section: Introductionmentioning

confidence: 99%

Comparative Study on the Crystallography of Isothermal and Athermal Precipitations in HCP–BCC System

Liu

2022

Materials

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Due to the diversity of the lattice parameter ratio c/a of hexagonal structure and precipitation mechanism, a systematic overview of this transformation has not been fully established, which draws back the attempt to control crystallographic features of the precipitates and microstructures of applied metals and alloys. Here, a comparative investigation to the crystallography of isothermal and athermal precipitations occurring in the HCP–BCC system was demonstrated in a full range of the lattice parameter ratio by using an invariant deformation element (IDE) model. It was then proposed that a precipitation in the HCP–BCC system could be either of the isothermal type if the observed habit plane Miller index falls into a zone axis of BCC <11w>(w ≠ 0) or HCP , or the athermal type when it is found to locate in a zone axis of BCC <11w](w = 0) or HCP [0001]. The crystallographic investigation on the precipitations in the HCP–BCC system in a full range of the lattice parameter may be a practical guide for computing material science when building a crystallographic interface model under an optimised orientation relationship, which is necessary to minimise the transformation system energy.

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Deformation twinning-induced single-variant ω-plates in metastable β-Ti alloys containing athermal ω-precipitates

Cited by 14 publications

References 64 publications

Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

Effect of thermomechanical treatment on structure and properties of metastable Ti-25Nb-8Sn alloy

A Review of Deformation Mechanisms, Compositional Design, and Development of Titanium Alloys with Transformation-Induced Plasticity and Twinning-Induced Plasticity Effects

Comparative Study on the Crystallography of Isothermal and Athermal Precipitations in HCP–BCC System

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