ω-Assisted nucleation and growth of α precipitates in the Ti–5Al–5Mo–5V–3Cr–0.5Fe β titanium alloy

Nag, S.; Banerjee, Rajarshi; Srinivasan, Raghavan; Hwang, Jun Yeon; Harper, Megan L.; Fraser, Hamish L.

doi:10.1016/j.actamat.2009.01.007

Cited by 428 publications

(188 citation statements)

References 21 publications

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“…The isothermal ½ phase is a metastable phase which can transform to the ¡ phase by diffusional process. 27,28) Thus it is inferred that the rapid diffusion rate of atoms in HPT-processed samples caused rapid transformation from the ½ phase to the ¡ phase during aging. As a result, the ½ phase is hard to be detected.…”

Section: Discussionmentioning

confidence: 99%

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

et al. 2014

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Precipitation behavior of ¡ phase in Ti15Mo alloy during isothermal aging after straining by high-pressure torsion (HPT) was investigated and compared with that without HPT process. Upon isothermal aging, ultrafine equiaxed ¡ phase particles and acicular ¡ phase plates were obtained in HPT-processed samples, while only the coarse acicular ¡ phase plates were obtained in the samples without HPT process. The precipitation of equiaxed ¡ phase occurred faster than the precipitation of acicular ¡ phase in HPT-processed samples. It seemed that a high density of dislocations resulted in highly strained area and enhanced atomic diffusivity, promoting the formation of equiaxed ¡ phase. The HPTprocessed samples exhibited higher hardness and ultimate tensile strength but lower ductility than those of the specimens without HPT process.

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Section: Discussionmentioning

confidence: 99%

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

et al. 2014

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“…Apart from earlier studies of martensite-based strain-induced transformation following cold deformation [5][6][7], the merit of manipulating the mechanical properties of candidate titanium alloys by strain-induced phase transformations at high temperature, utilizing the β↔α phase transformation, does not seem to have been fully assessed nor exploited, probably due to the complex phase transformations in titanium alloys and the practical difficulties of applying thermo-mechanical processing for the production of components of industrial importance.…”

Section: Introductionmentioning

confidence: 99%

Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

Dehghan-Manshadi

Dippenaar

2012

Materials Science and Engineering: A

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Strain-induced phase transformation studies have been conducted in a Ti-6Al-2Sn-4Zr-6Mo alloy. This alloy was subjected to b sub-transus deformation upon slow cooling from the b-phase field and the effect of strain on the extent and morphology of the phase transformation during hot-deformation was determined. In addition, the transformation kinetics and the morphology of the newly formed a-phase were studied following deformation under different cooling conditions. By applying strain, the rate of the b-to-a phase transformation increased significantly during deformation as well as during slow cooling following deformation. This increase in the kinetics of the b-to-a transformation can be ascribed to straininduced phase transformation. Also, the extent of deformation of the b-phase had a marked effect on the resulting morphology and size of the newly formed a-phase. Transformation of un-deformed b-phase rendered a-phase of acicular morphology only. However, following deformation of the b-phase, acicular as well as globular a-phase morphologies have been observed upon cooling. alloy. This alloy was subjected to β sub-transus deformation upon slow cooling from the β-phase field and the effect of strain on the extent and morphology of the phase transformation during hot-deformation was determined. In addition, the transformation kinetics and the morphology of the newly formed D-phase were studied following deformation under different cooling conditions. By applying strain, the rate of the β-to-α phase transformation increased significantly during deformation as well as during slow cooling following deformation. This increase in the kinetics of the E-to-D transformation can be ascribed to strain-induced phase transformation. Also, the extent of deformation of the β-phase had a marked effect on the resulting morphology and size of the newly-formed D-phase. Transformation of un-deformed β-phase rendered D-phase of acicular morphology only. However, following deformation of the β-phase, acicular as well as globular D-phase morphologies have been observed upon cooling.

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“…Nag et al and Duerig et al showed that a precipitated at b/x interfaces and dislocations in Ti-5553 and Ti-10-2-3 alloys. [24,26] Duerig et al described the disruption of the lattice at the b/x interface and at dislocations and reported them to be sites for a precipitation. In the same work, Duerig et al also explained that as the temperature increased closer to the b-transus, the precipitation of a became more inhomogeneous.…”

Section: Influence On Pwhts To A-phasementioning

confidence: 99%

“…However, subsequent thermal treatments, like aging at 873 K (600°C) for 4 hours, completely dissolved x or provided proper conditions for its consumption by a-precipitation, which has been shown by Nag and Deurig. [24][25][26] In addition to the existence of x in the as-welded FZ, the x-phase possibly exhibited three-fold atomic ordering. A more thorough discussion of the potential x-phase ordering in the as-welded specimen is found elsewhere.…”

Section: B Influence On Pwhts To X Phasementioning

confidence: 99%

Improving the Mechanical Properties of the Fusion Zone in Electron-Beam Welded Ti-5Al-5Mo-5V-3Cr Alloys

Marvel

Sabol

Pasang

et al. 2017

Metall Mater Trans A

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It is well-known that x-phase precipitates embrittle Ti-5553 alloys and that x-phase embrittlement can be overcome with appropriate heat treatments. However, the microstructural evolution of electron-beam welded Ti-5553 is not as understood as compared to the cast or wrought material. This study compared the microstructures of as-welded and post-weld heat-treated specimens by scanning and transmission electron microscopy, and similarly compared the localized mechanical behavior of the fusion zones with microhardness testing and digital image correlation coupled tensile testing. The primary observations were that the embrittling x-phase precipitates formed upon cooling, and could not be fully solutionized in a single-step treatment of 1077 K (804°C) for 1 hour. It was also discovered that nanoscale a-phase precipitates nucleated after the single-step treatment, although they were small in number and sparsely distributed. However, a two-step heat treatment of 1077 K (804°C) for 1 hour and 873 K (600°C) for 4 hours completely solutionized the x-phase and produced a dense network of 2-lm-wide a-phase plates, which significantly improved the mechanical properties. Overall, this study has shown that post-weld heat treatments improve the strength and ductility of electron-beam welded Ti-5553 alloys by controlling x-and a-phase evolution.

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ω-Assisted nucleation and growth of α precipitates in the Ti–5Al–5Mo–5V–3Cr–0.5Fe β titanium alloy

Cited by 428 publications

References 21 publications

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

Improving the Mechanical Properties of the Fusion Zone in Electron-Beam Welded Ti-5Al-5Mo-5V-3Cr Alloys

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ω-Assisted nucleation and growth of α precipitates in the Ti–5Al–5Mo–5V–3Cr–0.5Fe β titanium alloy

Cited by 428 publications

References 21 publications

Effect of High-Pressure Torsion Process on Precipitation Behavior of &alpha; Phase in &beta;-Type Ti&ndash;15Mo Alloy

Effect of High-Pressure Torsion Process on Precipitation Behavior of &alpha; Phase in &beta;-Type Ti&ndash;15Mo Alloy

Strain-induced phase transformation during thermo-mechanical processing of titanium alloys

Improving the Mechanical Properties of the Fusion Zone in Electron-Beam Welded Ti-5Al-5Mo-5V-3Cr Alloys

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Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy

Effect of High-Pressure Torsion Process on Precipitation Behavior of α Phase in β-Type Ti–15Mo Alloy