The Effect of Nb addition on microstructure, oxidation behavior and strength of some γ-TiAl alloys

Banumathy, S.; Neelam, Naga Sruthi; Chandravanshi, Vivek; Bhattacharjee, Anup Kumar; Ravi, K.R.

doi:10.1016/j.matpr.2017.12.141

Cited by 14 publications

(6 citation statements)

References 4 publications

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“…To further improve their properties, it is essential to create a well-defined and stable microstructure at application temperature. Since the mechanical properties are controlled by the phases and microstructure present at application temperature, a lot of experimental and theoretical studies have been performed to determine the phases, phase transformations, resulting microstructure morphologies, and the influence of certain alloying elements on mechanical properties [4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys

Distl

Hauschildt

Pyczak

et al. 2021

Metals

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The application of light-weight intermetallic materials to address the growing interest and necessity for reduction of CO2 emissions and environmental concerns has led to intensive research into TiAl-based alloy systems. However, the knowledge about phase relations and transformations is still very incomplete. Therefore, the results presented here from systematic thermal analyses of phase transformations in 12 ternary Ti-Al-Nb alloys and one binary Ti-Al measured with 4–5 different heating rates (0.8 to 10 °C/min) give insights in the kinetics of the second-order type reaction of ordered (βTi)o to disordered (βTi) as well as the three first-order type transformations from Ti3Al to (αTi), ωo (Ti4NbAl3) to (βTi)o, and O (Ti2NbAl) to (βTi)o. The sometimes-strong heating rate dependence of the transformation temperatures is found to vary systematically in dependence on the complexity of the transformations. The dependence on heating rate is nonlinear in all cases and can be well described by a model for solid-solid phase transformations reported in the literature, which allows the determination of the equilibrium transformation temperatures.

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Section: Introductionmentioning

confidence: 99%

Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys

Distl

Hauschildt

Pyczak

et al. 2021

Metals

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“…(iii) alteration of the morphology, volume fraction, and distribution of constituent phases by heat treatment [19,22,23].…”

Section: Alloy Developmentmentioning

confidence: 99%

Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Cobbinah

Matizamhuka

2019

Advances in Materials Science and Engineering

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A primary challenge associated with TiAl alloys is their low ductility at room temperature. One approach to overcome this flaw is attaining ultrafine grains in the alloy’s final microstructure. The powder metallurgy (PM) processing route favours the synthesising of ultrafine grains in TiAl alloys. This paper features the mechanical alloying (MA) process and rapid consolidation through the spark plasma sintering (SPS) technique, which comprises the PM process. Furthermore, a second approach discussed covers microalloying TiAl alloys. An evaluation of the influence of high oxygen content is also presented, including the formation of α-Al2O3. A section of the review delves into the dynamic recrystallisation mechanisms involved in elevated temperature deformation of TiAl alloys. The final section highlights the efficacy of ternary element additions to TiAl alloys against oxidation.

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“…De acordo com alguns autores [1,21] a adição de manganês ativa mecanismos de deformação por maclagem na fase γ, o que aumenta a ductilidade. Já o cromo [36] , além de poder influenciar na propriedade de tração das ligas tanto em temperatura ambiente quanto em elevadas por meio do refinamento dos grãos, também reduz a tetragonalidade e o volume das células unitárias da fase α 2 -Ti 3 Al com mudanças microestruturais intrínsecas [1,4,9,16,21,37] . Estudos mostram que adições da ordem de 1,5 (% at.)…”

Section: Influência Dos Elementos Ligaunclassified

“…Elementos como molibdênio, nióbio [5,23,36] , cromo [36] , vanádio [36,38] , manganês, prata, ferro e níquel [38] adicionados às ligas baseadas na fase γ-TiAl resultam na estabilização da fase β que pode efetivamente melhorar a ductilidade à temperatura ambiente e a deformação à quente dessas ligas [5,23,38,39] . Entretanto, em excesso, o β-Ti torna-se prejudicial à resistência à fluência.…”

Section: Influência Dos Elementos Ligaunclassified

“…Quando comparadas com as outras ligas, os aluminetos de titânio (TiAl) se revelam promissores para aplicações estruturais em substituição às superligas de Ni [4][5][6][7] , visto que apresentam principalmente, alto ponto de fusão (1400 -1500 °C), manutenção de elevados níveis de resistência mecânica em condições de temperaturas entre 600 e 950°C , e além disso, seu maior diferencial consiste na baixa densidade (3,8 -4,0 mg / cm 2 ), que resulta em uma redução de até 50% em massa dos componentes fabricados a partir desta liga [1,2,[8][9][10][11] .…”

Section: Introductionunclassified

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Caracterização microestrutural e comportamento à oxidação em temperaturas elevadas de ligas TiAl

Oliveira¹

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The Effect of Nb addition on microstructure, oxidation behavior and strength of some γ-TiAl alloys

Cited by 14 publications

References 4 publications

Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys

Solid-Solid Phase Transformations and Their Kinetics in Ti-Al-Nb Alloys

Solid-State Processing Route, Mechanical Behaviour, and Oxidation Resistance of TiAl Alloys

Caracterização microestrutural e comportamento à oxidação em temperaturas elevadas de ligas TiAl

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