β Phase decomposition in Ti–5Al–5Mo–5V–3Cr

Jones, N.G.; Dashwood, R. J.; Jackson, M.; Dye, David

doi:10.1016/j.actamat.2009.04.031

Cited by 213 publications

(101 citation statements)

References 17 publications

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“…For unwelded Ti-5553, many researchers have investigated various heat treatments for Ti-5553 to further improve its mechanical properties. [10][11][12][13][14][15][16] They have shown the implications of super-and sub-transus treatments, duplex treatments, interrupted cooling, fast cooling, slow cooling, and various other factors on the microstructural evolution and mechanical properties of Ti-5553. These treatments include common heat treatments, such as the beta-annealed slow cool age (BASCA) treatment, a+b solution treatment (ST), a+b solution treatment and age (STA), modified STA, aging, and stress relief, where the STA and aging have proven to impart the highest strength.…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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“…The phase formed possesses certain orientation relationships (ORs) with the parent phase (Burgers, 1934;Pitsch & Schrader, 1958;Potter, 1973). The diffraction spots of the phase in transmission electron microscopy (TEM) selected-area electron diffraction (SAED) are located close to the 1/2 diffraction positions (Jones et al, 2009). The !…”

Section: Introductionmentioning

confidence: 99%

The origin of striation in the metastable β phase of titanium alloys observed by transmission electron microscopy

Fan

Zhang

et al. 2017

J Appl Crystallogr

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For the phase of Ti-5553-type metastable -Ti alloys, striations in transmission electron microscopy (TEM) bright-and dark-field images have been frequently observed but their origin has not been sufficiently investigated. In the present work, this phenomenon is studied in depth from the macroscopic scale by neutron diffraction to the atomic scale by high-resolution TEM. The results reveal that the phase contains homogeneously distributed modulated structures, intermediate between that of the phase (cubic) and that of the phase or the ! phase (hexagonal), giving rise to the appearance of additional diffraction spots at 1/2, 1/3 and 2/3 diffraction positions. The intermediate structure between and is formed by the atomic displacements on each second {110} plane in the h110i direction, whereas that between and ! is formed by atomic displacements on each second and third {112} plane in the opposite h111i direction. Because of these atomic displacements, the {110} and {112} planes become faulted, resulting in the streaking of diffraction spots and the formation of extinction fringes in TEM bright-and dark-field images, the commonly observed striations. The present work reveals the origin of the striations and the intrinsic correlation with the additional electron reflections of the phase.

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“…Em outros estudos em que a transformação de fase em ligas β-metaestáveis também na condição inicial como-temperada foi explorada pela óptica da taxa de aquecimento, evidenciou-se que o aumento dessa taxa torna a distribuição das fases α'' e α mais homogênea ao longo da matriz β [6,[8][9][10][11], além de minimizar a precipitação durante o aquecimento. Em especial Ivasishin et al…”

Section: Em Parceria Com O German Aerospace Center (Dlr) E a Vienna Uunclassified

“…A precipitação da fase α durante tratamento isotérmico de envelhecimento ou aquecimento lento dentro do campo de fase α + β é a maneira mais efetiva de se aumentar a resistência mecânica das ligas do tipo β-metaestáveis. Sítios favoráveis à nucleação da fase α, tais como fases metaestáveis ω e α", interfaces do tipo ω/β [17], partículas intermetálicas e defeitos como discordâncias [25,52], além de locais favoráveis à difusão de soluto como discordâncias, contornos de grão e vacâncias, favorecem o desenvolvimento dessa fase com morfologias aptas a suportarem tensões de escoamento de até 1250 MPa [6]. Isso é possível graças ao equilibrio entre difusão e nucleação; a difusão atômica ocorre a longo alcance, porém, de forma lenta devido à restrição imposta pelos átomos substitucionais β-estabilizadores, tais como como Mo, V e Zr, o que restringe o crescimento dos precipitados da fase α. Simultaneamente, a taxa de precipitação dessa fase é facilitada devido a grande quantidade de sítios favoráveis à sua nucleação.…”

Section: Decomposição Espinodal E Nucleaçãounclassified

“…Dessa maneira, desenvolveu-se a partir da pioneira russa VT-22 (Ti-6Al-5V-5-Mo-1Cr-1Fe) [4] a também β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr (Ti-55531), relativamente nova no mercado e relevante por apresentar uma ampla janela de processamento termomecânico, a partir da qual é possível alcançar melhorias consideráveis em suas propriedades mecânicas [5][6][7]. Por ampla janela de processamento entende-se que esta liga é menos sensível a variações térmicas e à taxa de deformação que, por exemplo, a largamente empregada Ti-10-2-3 [5].…”

Section: Introdução E Justificativasunclassified

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Estudo <i>in situ</i> da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-X com luz síncrotron de alta energia

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Estudo in-situ da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-x com luz síncrotron de alta energia RAFAEL PAIOTTI MARCONDES GUIMARÃES São Carlos RAFAEL PAIOTTI MARCONDES GUIMARÃESEstudo in-situ da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-x com luz síncrotron de alta energia Recently introduced, the new Ti-55531 titanium based alloy has been developed aiming structural applications such as the automotive and aerospace ones. The present Thesis is focused on the assessment of Ti-55531 alloy in situ solid state transformations during ageing at different temperatures as well as initial conditions. In this sense, the study emphasis will deal with both quantitative and qualitative analysis of the main constitutive phases found in the alloy, namely the body-centered cubic β, both hexagonal α and ω and the martensitic α", this one orthorhombic, by means of Rietveld refinement. Concerning the data, it was obtained by high energy x-ray diffraction (HEXRD) technique in a synchrotron light source facility. All the Debye-Scherrer rings resulting from these in situ experiments were analyzed by both FIT2Dand MAUD software.

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β Phase decomposition in Ti–5Al–5Mo–5V–3Cr

Cited by 213 publications

References 17 publications

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

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

The origin of striation in the metastable β phase of titanium alloys observed by transmission electron microscopy

Estudo <i>in situ</i> da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-X com luz síncrotron de alta energia

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β Phase decomposition in Ti–5Al–5Mo–5V–3Cr

Cited by 213 publications

References 17 publications

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

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

The origin of striation in the metastable β phase of titanium alloys observed by transmission electron microscopy

Estudo <i>in situ</i> da solubilização e do envelhecimento da liga &beta;-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-X com luz síncrotron de alta energia

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Estudo <i>in situ</i> da solubilização e do envelhecimento da liga β-metaestável Ti-5Al-5Mo-5V-3Cr-1Zr usando difração de raio-X com luz síncrotron de alta energia