Influence of oxygen content on microstructure and mechanical properties of Ti–Nb–Ta–Zr alloy

Wei, Qianqian; Wang, Liqiang; Fu, Yuanfei; Qin, Jining; Lü, Weijie; Zhang, Di

doi:10.1016/j.matdes.2010.11.049

Cited by 141 publications

(57 citation statements)

References 17 publications

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“…The elemental concentrations were very close to the nominal composition, which is critical, especially in the case of oxygen, where small changes in concentration can have dramatic effects on the transformation behaviour of this type of alloy [7,8,12,14].…”

Section: As-extruded Condition Materialsmentioning

confidence: 76%

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The Behaviour of Gum Metal (Ti‐36Nb‐2Ta‐3Zr‐0.3O wt.%) During Superelastic Cycling

Jones

Vorontsov

Dye

2016

Proceedings of the 13th World Conference on Titanium

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Metastable beta titanium alloys, such as Gum Metal (Ti-36Nb-2Ta-3Zr-0.3O wt.%), have received significant attention from the biomedical field over the last decade due to their low elastic modulus. Despite initial scepticism, it is now widely accepted that these alloys undergo a stress-induced transformation when subjected to an applied load, forming an orthorhombic martensite phase within the beta matrix. The reversible nature of this transformation gives rise to superelasticity, which is of significant interest for engineering applications outside of the biomedical industry. However, little is known as to the stability of the superelastic behaviour with respect to repeated load cycling. Here the response of Gum Metal during superelastic cycling was studied in situ, using high energy synchrotron diffraction. The material was observed to accumulate permanent damage with every cycle and the critical stress required for transformation decreased. The diffraction data was used to track the evolution of the martensite phase, both as a function of applied stress and cycle number. The martensite that formed was highly textured, with two independent orientations observed on each Debye-Scherrer ring. These orientations formed at different applied stresses and had different volume fractions at the peak stress. The volume fraction at the peak stress of all martensite orientations increased with cycling, which is believed to increase the defect concentration in the material and hence influence the deformation behaviour.

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Section: As-extruded Condition Materialsmentioning

confidence: 76%

“…One of the key observations made across all of the Ti-Nb based alloys that exhibit superelastic behaviour is the critical role that oxygen plays in determining the deformation response [7,8,12]. Interstitial oxygen suppresses the martensite transformation temperature and raises the critical stress required to mechanically induce [1,8,13].…”

Section: Introductionmentioning

confidence: 99%

The Behaviour of Gum Metal (Ti‐36Nb‐2Ta‐3Zr‐0.3O wt.%) During Superelastic Cycling

Jones

Vorontsov

Dye

2016

Proceedings of the 13th World Conference on Titanium

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“…The density of Gum Metal equals around 5.6 g/cc which locates it between steels and aluminium alloys. The amount of oxygen in Gum Metal significantly changes its microstructure, mechanical and thermomechanical properties [7,8,11,15]. Deformation mechanisms occurring in Gum Metal are unconventional and still unclear.…”

Section: Introductionmentioning

confidence: 99%

Infrared thermography applied for experimental investigation of thermomechanical couplings in Gum Metal

Golasiński¹,

Pieczyska²,

Staszczak³

et al. 2016

Proceedings of the 2016 International Conference on Quantitative InfraRed Thermography

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Results of initial investigation of thermomechanical couplings in innovative β-Ti alloy called Gum Metal subjected to tension are presented. The experimental set-up, consisting of testing machine and infrared camera, enabled to obtain stress-strain curves with high accuracy and correlate them to estimated temperature changes of the specimen during the deformation process. Both ultra-low elastic modulus and high strength of Gum Metal were confirmed. The infrared measurements determined average and maximal temperature changes accompanying the alloy deformation process, allowed to estimate thermoelastic effect, which is related to the alloy yield point. The temperature distributions on the specimen surface served to analyze strain localization effects leading to the necking and rupture. MotivationGum Metal, a new class of β-type multifunctional titanium alloys, has attracted considerable attention in the past decade due to its outstanding mechanical properties. The underlying mechanisms of its excellent performance are still unclear. The literature reports have not covered thermographic analysis of the alloy so far. Since infrared techniques and studies of thermomechanical couplings are a great tool for better understanding of mechanical behavior and phenomena occurring in materials the present research aimed at conducting thermomechanical and thermographic investigation of Gum Metal during tension. IntroductionGum Metal is a β-type Ti-based superalloy developed in Japan and reported first in 2003 [1]. Three electronic parameters were proposed for providing β phase stability: (1) a compositional average valence number (e/a) of about 4.24; (2) a bond order (Bo value) of about 2.87; and (3) a ""d" electron-orbital energy level (Md value) of about 2.45 eV. In addition, the oxygen concentration in the alloy is restricted to a range between 0.7 and 3.0 at.% [1]. Typical compositions meeting these requirements are: Ti-12Ta-9Nb-3V-6Zr-1.5O or Ti-20Nb-3.5Ta-3.4Zr-1.2O. The fabrication route of Gum Metal includes powder sintering technique and processing by cold rolling. Both the fabrication route and the chemical composition strongly influence the superalloy characteristics. Gum Metal is known by the following outstanding properties: ultra-low elastic modulus with very high strength, rubber-like Poisson"s ratio, superelastic nature -one digit higher in nonlinear elastic deformation (≈2.5%) when compared to other metallic materials, super-plastic nature allowing cold plastic working without hardening up to ≈90%, very low linear coefficient of thermal expansion (similar to Invar) and a constant elastic modulus in the temperature range from -200°C to +250°C (similar to Elinvar) [1][2][3][4]. The density of Gum Metal equals around 5.6 g/cc which locates it between steels and aluminium alloys. The amount of oxygen in Gum Metal significantly changes its microstructure, mechanical and thermomechanical properties [7,8,11,15]. Deformation mechanisms occurring in Gum Metal are unconventional and still unclear. First they wer...

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mentioning

confidence: 99%

酸素固溶強化による高強度チタン粉末焼結材の創製

Sun¹,

Li²,

Imai³

et al. 2012

Journal of Smart Processing

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Ti-6Al-4V (64Ti) 900 MPa [1][2][3][4][5] 14 % (V) 64Ti V Nb [6][7][8][9] 33 at.% [10][11][12] 99. The applications of Ti and its alloys are limited to high-performance products because of expensive cost and poor plastic formability. In this study, pure Ti powder was consolidated by using spark plasma sintering (SPS), warm compaction and cold compaction, respectively. The mechanical properties of the hot-extruded powder metallurgy (P/M) pure Ti materials were evaluated in order to develop a cost-effective processing. The specimen prepared by warm compaction showed a higher tensile strength of 973.7 MPa and a better elongation of 26.0 % comparing with other materials. Orientation, grain refinement and solid solution strengthening mechanism were discussed respectively. Solution strengthening of oxygen was considered as the main strengthening factor in this study. The strengthening effect of solid solution of oxygen was calculated as 370.6 MPa/at.%[O] on 0.2 %YS.Key Words: Powder Metallurgy, Spark Plasma Sintering, Solid Solution, Strengthening

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Influence of oxygen content on microstructure and mechanical properties of Ti–Nb–Ta–Zr alloy

Cited by 141 publications

References 17 publications

The Behaviour of Gum Metal (Ti‐36Nb‐2Ta‐3Zr‐0.3O wt.%) During Superelastic Cycling

The Behaviour of Gum Metal (Ti‐36Nb‐2Ta‐3Zr‐0.3O wt.%) During Superelastic Cycling

Infrared thermography applied for experimental investigation of thermomechanical couplings in Gum Metal

酸素固溶強化による高強度チタン粉末焼結材の創製

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