Low Young’s modulus in Ti–Nb–Ta–Zr–O alloys: Cold working and oxygen effects

Tane, Masakazu; Nakano, Takayoshi; Kuramoto, Shigeru; Hara, Masashi; Niinomi, Mitsuo; Takesue, Naohisa; Yano, Takeshi; Nakajima, Hideo

doi:10.1016/j.actamat.2011.07.050

Cited by 130 publications

(53 citation statements)

References 55 publications

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“…The ambient compressibility of gum metal measured here is found to be close to that for similar super-elastic alloys studied using acoustic resonance in Ref. [31] containing 0.36 wt. % O.…”

Section: Discussionsupporting

confidence: 48%

On the high-pressure phase stability and elastic properties ofβ-titanium alloys

Smith¹,

Joris²,

Sankaran³

et al. 2017

J. Phys.: Condens. Matter

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We have studied the compressibility and stability of different β-titanium alloys at high pressure, including binary Ti-Mo, Ti-24Nb-4Zr-8Sn (Ti2448) and Ti-36Nb-2Ta-0.3O (gum metal). We observed stability of the β phase in these alloys to 40 GPa, well into the ω phase region in the P-T diagram of pure titanium. Gum metal was pressurised above 70 GPa and forms a phase with a crystal structure similar to the η phase of pure Ti. The bulk moduli determined for the different alloys range from 97 ± 3 GPa (Ti2448) to 124 ± 6 GPa (Ti-16.8Mo-0.13O).

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“…The ambient compressibility of gum metal measured here is found to be close to that for similar super-elastic alloys studied using acoustic resonance in Ref. [31] containing 0.36 wt. % O.…”

Section: Discussionsupporting

confidence: 48%

On the high-pressure phase stability and elastic properties ofβ-titanium alloys

Smith¹,

Joris²,

Sankaran³

et al. 2017

J. Phys.: Condens. Matter

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“…These peculiarities triggered three main research directions focusing on the role of chemical composition variations (e.g. of oxygen [5,10,15]), non-linear elastic behaviour [2][3][4] and plastic deformation mechanisms [6][7][8][9]16]. We focus here, on the other hand, mainly on the underlying microstructural causes of another mechanical anomaly: this material exhibits high strength and ductility even upon 90 % cold swaging [1].…”

Section: Introductionmentioning

confidence: 98%

“…In the past decade, Ti-Nb-based gum metal has drawn significant attention due to its superior mechanical properties and the complexity of the reported deformation mechanisms [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. It exhibits significantly extended elastic regime (with a low elastic modulus of *40 GPa) and plastic deformation regime (with very low strain hardening rate).…”

Section: Introductionmentioning

confidence: 98%

Damage resistance in gum metal through cold work-induced microstructural heterogeneity

et al. 2015

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Cold-worked alloys exhibit high strength, but suffer from limited ductility. In contrast, Ti-based gum metal was reported to exhibit high strength combined with good ductility upon severe pre-straining. Motivated by this anomaly, we systematically studied the evolution of gum metal microstructure during severe cold working (swaging and rolling) and the resulting deformation and damage micro-mechanical mechanisms during follow-up tensile deformation. To this end, various experimental in situ and post-mortem methodologies are employed, including scanning electron microscopy imaging, high-resolution electron backscatter diffraction mapping and transmission electron microscopy. These observations reveal that intense grain refinement takes place through dislocation plasticitydominated deformation banding upon cold working. The observed enhancement in crack blunting and failure resistance which prolongs the post-necking ductility of gum metal during follow-up tensile straining can be attributed to the deformation-induced development of local heterogeneities in texture and grain size.

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“…Bobylev et al suggested a mechanism of nanograin formation due to giant fault deformation in Gum Metal 9) . The dislocation-free deformation is considered to realize under the conditions: (1) ideal shear strength is quite low due to the low elastic modulus which occurs as a phonon softening near the phase boundary of β-and α-phases 10) , (2) due to the presence of high concentration of interstitial oxygen atoms also of deformation produced nanometer sized ω-phase particles 11) , the dislocation glide stress becomes higher than the ideal shear strength and (3) due also to the presence of high concentration of oxygen, stress-induced martensitic transformation from β to α is suppressed [12][13][14] . Nucleation and evolution of nanodisturances in Gum Metal is theoretically proposed 15) .…”

Section: Introductionmentioning

confidence: 99%

Basic Deformation Mechanism of Bcc Titanium-Based Alloy of Gum Metal

et al. 2016

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Single crystals and cold-swaged polycrystalline specimens of Gum Metal of Ti-36Nb-2Ta-3Zr-0.3O (mass %) have been compressed with the stress-relaxation test in the temperature range from 77 K to 450 K. In both single crystals and cold-swaged specimens, the yield stress decreases with increasing temperature rapidly to the room temperature and then gently above it forming a plateau at high temperature. The activation analysis of plastic deformation showed that the applied shear stress dependence of activation enthalpy and that of activation volume for single crystals and those for cold swaged specimens are almost identical if we shift the stress scale by about 120 MPa, meaning that the basic deformation mechanism is common to both samples. The above results are contradictory with the previously proposed non-dislocation deformation mechanism at the ideal shear strength, but consistent with the established features of usual bcc alloys, i.e., the deformation is governed by the Peierls mechanism at low temperature and by defect hardening at high temperature. τ χ − χ and ψ − χ relations of single crystals showed a typical slip asymmetry seen in bcc metals, where slip in Gum Metal belongs to the {112} slip type as in binary Ti-Nb single crystals reported previously (S. Hanada et al.: Metall. Trans. A 16 (1985) 789). Yielding by massive {332}〈113〉 twin formation in single crystals at low temperatures was observed for the rst time in Gum Metal.

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Low Young’s modulus in Ti–Nb–Ta–Zr–O alloys: Cold working and oxygen effects

Cited by 130 publications

References 55 publications

On the high-pressure phase stability and elastic properties ofβ-titanium alloys

On the high-pressure phase stability and elastic properties ofβ-titanium alloys

Damage resistance in gum metal through cold work-induced microstructural heterogeneity

Basic Deformation Mechanism of Bcc Titanium-Based Alloy of Gum Metal

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