Deformation and failure behaviour of a titanium alloy Ti-407 with reduced aluminium content: A comparison with Ti-6Al-4V in tension and compression

Sneddon, Scott; Mulvihill, Daniel M.; Wielewski, Euan; Dixon, Mark; Rugg, David; Li, Peifeng

doi:10.1016/j.matchar.2021.110901

Cited by 16 publications

(4 citation statements)

References 29 publications

(32 reference statements)

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“…10(b, d), plotted as ÔnotionalÕ true r e ð Þ calculated from F u ð Þ using Eq. (1). The match between FE predictions and experiments is good for most test conditions, being at most 10%, and usually much closer less.…”

Section: Corrected Stress-strain Curves and Validation (Ti64)mentioning

confidence: 79%

Finite Element Modeling of Hot Compression Testing of Titanium Alloys

Jedrasiak

Shercliff

Mishra

et al. 2022

J. of Materi Eng and Perform

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This paper presents experimental results and finite element analysis of hot upsetting of titanium alloys Ti64 and Ti407 using a dilatometer in loading mode. All samples showed barrelling, as a consequence of an inhomogeneous temperature distribution and friction. The FE analysis is a full thermomechanical model of the test calibrated using multiple thermocouples. At each nominal temperature and strain rate, the true flow stress–strain response is inferred using the difference between the initially assumed constitutive response input to the FE analysis, $$\sigma =f\left(T,\dot{\varepsilon },\varepsilon \right)$$ σ = f T , ε ˙ , ε , and the predicted response of the model. The analysis applies new procedures for: (1) modeling the thermal gradient; (2) finding the flow stress correction due to the inhomogeneity, using literature data as the input to the FE analysis; and (3) smoothing the constitutive data, fitting empirical $$\sigma =f\left(T,\dot{\varepsilon }\right)$$ σ = f T , ε ˙ surfaces at multiple discrete strains. The extracted true constitutive data confirm the moderate strain-softening behavior in Ti64 alloy, and the FE model predicts the distribution of local deformation conditions, for application in interpretation of microstructure and texture evolution. This highlights the difference between nominal and actual test conditions, showing that the discrepancy varies systematically with test conditions, with the central strain and strain rate being magnified significantly, by factors of order 2–3.

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Section: Corrected Stress-strain Curves and Validation (Ti64)mentioning

confidence: 79%

Finite Element Modeling of Hot Compression Testing of Titanium Alloys

Jedrasiak

Shercliff

Mishra

et al. 2022

J. of Materi Eng and Perform

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“…In tension, Ti-407 alloy has significantly increased ductility (quasi-static strain to failure increase of 60%) but reduced strength (quasi-static ultimate strength reduction of 34%) in comparison to Ti-6Al-4V. The combination of an increase in ductility and a reduction in strength gives similar toughness values for the two alloys [5].…”

Section: Introductionmentioning

confidence: 98%

Effect of Initial Microstructure on the Temperature Dependence of the Flow Stress and Deformation Microstructure under Uniaxial Compression of Ti-407

Barboza,

López,

Guajardo

et al. 2024

Metals

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In this study, the influence of initial microstructure and deformation temperature on the flow stress behavior and microstructural evolution of TIMETAL®407 (Ti-407) alloy are investigated. For this purpose, compression cylinders were β-annealed at 940 °C and then cooled to room temperature using furnace cooling, static air, and water quenching to promote three initial microstructures with different α lath thicknesses. The annealed cylinders were compressed isothermally in the range of 750 °C to 910 °C at a constant crosshead speed of 0.05 mm/s up to an engineering strain of −0.8. The resulting stress–strain curves are discussed in terms of the morphology and distribution of the α and β phases. It was found that flow stress is inversely proportional to deformation temperature for all initial microstructures. At the lowest temperatures, compressive yield strength was higher in water-quenched and air-cooled samples than in furnace-cooled specimens, suggesting that the acicular α-phase morphology obtained by rapid cooling could enhance mechanical strength by hindering dislocation motion. Two high-temperature flow regimes were determined based on the shape of the flow stress curves, indicating microstructural changes occurring during deformation. At higher temperatures, the effect of the initial microstructure is negligible as the primary α phase is transformed to the β phase at around 850 °C irrespective of the initial α-lath thickness.

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“…It was also reported that metastable β-type Ti-alloys have a better cold formability and a lower elastic modulus than α and near-α or α + β Ti alloys [ 40 , 41 , 42 , 43 ]; therefore, the development of new β-type Ti alloys containing non-toxic elements such as Nb, Zr and Ta is very important. Both chemical composition and microstructure have an important influence on the biocompatibility of Ti-based alloys.…”

Section: Introductionmentioning

confidence: 99%

“…By tailoring the thermomechanical processing route, mechanical characteristics, such as ductility and toughness, can increase significantly [ 38 , 39 ]. Depending on the alloy’s composition, different mechanisms such as dislocation slip, twinning or stress-induced martensite (SIM), or a combination of them, can occur in order to accommodate the applied stress [ 40 , 41 , 42 ].…”

Section: Introductionmentioning

confidence: 99%

Evolution of Microstructural and Mechanical Properties during Cold-Rolling Deformation of a Biocompatible Ti-Nb-Zr-Ta Alloy

et al. 2022

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In this study, a Ti-32.9Nb-4.2Zr-7.5Ta (wt%) titanium alloy was produced by melting in a cold crucible induction in a levitation furnace, and then deforming by cold rolling, with progressive deformation degrees (thickness reduction), from 15% to 60%, in 15% increments. The microstructural characteristics of the specimens in as-received and cold-rolled conditions were determined by XRD and SEM microscopy, while the mechanical characteristics were obtained by tensile and microhardness testing. It was concluded that, in all cases, the Ti-32.9Nb-4.2Zr-7.5Ta (wt%) showed a bimodal microstructure consisting of Ti-β and Ti-α″ phases. Cold deformation induced significant changes in the microstructural and the mechanical properties, leading to grain-refinement, crystalline cell distortions and variations in the weight-fraction ratio of both Ti-β and Ti-α″ phases, as the applied degree of deformation increased from 15% to 60%. Changes in the mechanical properties were also observed: the strength properties (ultimate tensile strength, yield strength and microhardness) increased, while the ductility properties (fracture strain and elastic modulus) decreased, as a result of variations in the weight-fraction ratio, the crystallite size and the strain hardening induced by the progressive cold deformation in the Ti-β and Ti-α″ phases.

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Deformation and failure behaviour of a titanium alloy Ti-407 with reduced aluminium content: A comparison with Ti-6Al-4V in tension and compression

Cited by 16 publications

References 29 publications

Finite Element Modeling of Hot Compression Testing of Titanium Alloys

Finite Element Modeling of Hot Compression Testing of Titanium Alloys

Effect of Initial Microstructure on the Temperature Dependence of the Flow Stress and Deformation Microstructure under Uniaxial Compression of Ti-407

Evolution of Microstructural and Mechanical Properties during Cold-Rolling Deformation of a Biocompatible Ti-Nb-Zr-Ta Alloy

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