Study of transformation behavior in a Ti–4.4 Ta–1.9 Nb alloy

Mythili, R.; Paul, V. Thomas; Saroja, S.; Vijayalakshmi, M.; Raghunathan, V.S.

doi:10.1016/j.msea.2004.08.035

Cited by 50 publications

(38 citation statements)

References 9 publications

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“…Phase transformation resulting from the deformation of metals, like steel, are intentionally used to improve properties [5,6]. It is generally accepted that metastable grades of b titanium alloys may undergo deformation via the formation of SIM [7][8][9][10][11][12][13][14][15][16][17][18]. Control of this mechanism could provide a new route to the optimization of the load bearing capabilities of titanium alloys.…”

Section: Introductionmentioning

confidence: 99%

Tuning the stress induced martensitic formation in titanium alloys by alloy design

Chen

et al. 2012

J Mater Sci

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Two novel titanium alloys, Ti-10V-2Cr-3Al and Ti-10V-1Fe-3Al (wt%), have been designed, fabricated, and tested for their intended stress-induced martensitic (SIM) transformation behavior. The results show that for Ti-10V-1Fe-3Al the triggering stress for SIM transformation is independently affected by the b domain size and b phase stability, when the value of the molybdenum equivalent is higher than *9. The triggering stress was well predicted using the equations derived separately for the commercial Ti-10V-2Fe-3Al alloy. For samples containing b with a lower molybdenum equivalence value, pre-existing thermal martensite is also present and this was found to have an obstructive effect on SIM transformation. In Ti-10V-2Cr-3Al, the low diffusion speed of Cr caused local gradients in the Cr level for many heat treatments leading even to martensite free zones near former b regions.

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Section: Introductionmentioning

confidence: 99%

Tuning the stress induced martensitic formation in titanium alloys by alloy design

Chen

et al. 2012

J Mater Sci

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“…β-phase stability in titanium alloys can be assessed through the use of the so called molybdenum equivalent [Mo eq] 7 . If the [Mo eq] value is higher than 10 or 11 wt.…”

Section: Introductionmentioning

confidence: 99%

“…If the [Mo eq] value is higher than 10 or 11 wt. (%) 7,8 , β phase is retained during quenching from temperatures above the β transus in a metastable condition at room temperature. However, if this value is lower, martensitic transformation may occur during quenching, forming either the α' (hexagonal) or α'' (orthorhombic) phases, depending on the solute concentration in the alloy 9 .…”

Section: Introductionmentioning

confidence: 99%

THe effect of niobium content on the hardness and elastic modulus of heat-treated ti-10mo-xnb alloys

Gabriel

Dille²,

Nunes

et al. 2010

Mat. Res.

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This study has investigated the niobium (Nb) additions effect on both microstructure and heat-treated Ti-10Mo-xNb (x = 3, 6 and 9) alloys mechanical properties. The microstructures were characterized by optical microscopy, X-ray diffraction and transmission electron microscopy. The mechanical characterization was carried out by Vickers microhardness test and Young's modulus measurements. The outcomes show that the addition of Nb in alloys decreased the proportion of ω and α' phases. The Ti-10Mo-3Nb alloy presented the best hardness and elastic modulus combination among the three developed alloys and also with respect to Ti-6Al-4V alloy and commercially pure Ti.

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“…This concept consists of evaluating the b-stabilizer effect of a Ti-based alloy constituted of different alloying elements with different b-stabilizer abilities. This wt.%Mo eq can thus be calculated by the following empirical formula: [14,15] wt.%Mo eq = 1.0(wt.%Mo) + 0.22(wt.%Ta) + 2.9(wt.%Fe)... -1.0 (wt.%Al)…”

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confidence: 99%

Synthesis and Phase Transformations of Beta Metastable Ti‐Based Alloys Containing Biocompatible Ta, Mo and Fe Beta‐Stabilizer Elements

et al. 2006

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If an alloy contains even a small amount of a toxic element for human body, there is fear that trace amounts of the element may be released during prolonged use. Originally used as an aircraft material, the Ti-6Al-4V alloy (a+b type alloy) is now widely used a biomaterial. Since this alloy contains a small amount of vanadium, which has been shown to be cytotoxic at excess levels, there is concern over its effects on biological tissues. [1] Newly developed Ti-based biomaterials consist of low cytotoxic elements such as Zr, Nb, Mo, Ta... By addition of the cited b-stabilizer elements, stable or metastable b-type titanium alloys can be obtained. [2] These alloys are particularly useful because of their strength and excellent cold deformability. Moreover, they are now recognized as advanced materials for orthopedic applications. [2][3][4] Advantages of b/near-b titanium alloys over a near-a or a+b alloys include their lower modulus and better formability. [5][6][7] Consequently, b-titanium alloys allow a greater load transfer from the artificial implant to the adjacent remodeled bone. The bone resorption is then minimized and a possible loosening of the prosthetic device is avoided. [8] We have recently developed a non-toxic b-metastable Ti-based alloy containing Mo and Ta b-stabilizer elements. This alloy was shown to exhibit a good balance of hardness and Young modulus with high corrosion resistance in simulated body fluid. [9,10] It is well known that when b-metastable Ti alloys are aged, x and a phases appear depending on the ageing temperature. In these alloys, a duplex thermal treatment has been proposed to control the precipitation of a phase: the x phase acting as a nucleation site for the precipitation of a leading to homogeneously and finely dispersed a nanophase particles in the b matrix. The strength and the fracture toughness of b-metastable Ti alloys are then considerably enhanced by this duplex ageing process. [11,12] In the present study, phase transformation behaviors of six new b-type Ti alloys synthesized from Ti-Ta-Mo (3 alloys) and Ti-Ta-Mo-Fe (3 alloys) systems were investigated. There were compared with the industrial «Low Cost Beta» (LCB) metastable Ti alloy developed by Timet and recently studied by our group. [12,13] The different phase transitions upon heating were detected by employing Electric Resistivity Measurements (ERM) and Differential Scanning Calorimetry (DSC). In such alloys, the thermally activated nanostructure was observed by using Transmission Electron Microscopy (TEM).We have preliminary synthesized the alloys by arc-melting furnace. The alloys were then quenched in water from the beta phase field (see experimental). The different chemical compositions of the quenched Ti-based alloys are presented in Table 1. The chemical compositions (in wt%) were checked by EDS analysis and each nominal composition was measured with less than 1 % error, which corresponds to the precision of the EDS analysis method. In this table is also presented the LCB metastable Ti alloy (in italic) cont...

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Study of transformation behavior in a Ti–4.4 Ta–1.9 Nb alloy

Cited by 50 publications

References 9 publications

Tuning the stress induced martensitic formation in titanium alloys by alloy design

Tuning the stress induced martensitic formation in titanium alloys by alloy design

THe effect of niobium content on the hardness and elastic modulus of heat-treated ti-10mo-xnb alloys

Synthesis and Phase Transformations of Beta Metastable Ti‐Based Alloys Containing Biocompatible Ta, Mo and Fe Beta‐Stabilizer Elements

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