Scale composition and oxidation mechanism of the Ti–46Al–8Nb alloy in air at 700 and 800 °C

Mitoraj, M.; Godlewska, E.; Heintz, O.; Geoffroy, Nicolas; Fontana, Sébastien; Chevalier, S.

doi:10.1016/j.intermet.2010.09.006

Cited by 35 publications

(21 citation statements)

References 60 publications

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“…This property limits the service temperature of titanium to $550°C. 26 Although the high-temperature oxidation of titanium and its alloys has been the subject of several research efforts, [27][28][29][30][31][32] such studies are often constrained to the composition of specific alloys and neither the mechanisms associated with evolution of oxide layers nor the effects of oxygen on the microstructure of the material are well understood. The latter is the focus of this brief case study.…”

Section: Motivationmentioning

confidence: 99%

Discovery via Integration of Experimentation and Modeling: Three Examples for Titanium Alloys

Liu

Samimi

Ghamarian

et al. 2014

JOM

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One key aspect of any integrated computational materials engineering approach is the integration of experiments that provide critical information for the modeling activities. This article describes, using case studies, three examples of critical experiments that have been conducted in an integrated fashion with modeling activities for titanium alloys, providing valuable information in an accelerated manner. The first has been used to identify key microstructural features associated with fracture toughness in Ti-6Al-4V and integrates artificial neural networks and various experimental techniques. The second is associated with defect accumulation in highly constrained titanium structures and integrates a highly innovative characterization technique (precession electron diffraction) and dislocation dynamics. The third is a high-throughput combinatorial technique to understand the oxidation behavior of titanium alloys and couples the experimental effort with the CALPHAD approach. INTRODUCTIONThe composition, microstructure, and defect structures of advanced nonferrous structural alloys are the predominant factors that govern the response of the material to an externally applied stimulus. For example, there will be an elasticplastic response of the material to an externally applied load. Similarly, there will be a compositional and structural evolution in response to thermal excursions. Although these responses are expected to occur, the precise details of the responses are less well understood. integrated computational materials engineering (ICME), or integrated computational materials science and engineering (ICMSE), is a strategy to integrate knowledge, represented by both computation/simulation and high-fidelity experimental databases, from across the composition-microstructure-processing-property paradigm so as to engineer a solution to a design problem. ICME strategies are increasingly being put into service and adding value. 1-4 However, to be effective the individual components must accurately describe materials phenomena.For many structural materials, the precise details of materials response to external stimuli are not well understood. Often, an integrated experimental and computational approach can help elucidate these missing details. While not representing a complete ICME program, each of these integrated activities has provided knowledge that was otherwise lacking. Each of these programs is related to a different problem facing a particular class of nonferrous structural alloys-titanium-based alloys. These include efforts to understand the following: the influence of microstructure on the fracture toughness of a + b-processed Ti-6Al-4V, the influence of defect populations on performance of single-phase and two-phase titanium alloys, and the role of composition on the oxidation behavior of several titanium alloys. The motivation and details of each problem are described separately, as are the conclusions. It is seen that the integration of critical and careful experiments with various modeling schemes ca...

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Section: Motivationmentioning

confidence: 99%

Discovery via Integration of Experimentation and Modeling: Three Examples for Titanium Alloys

Liu

Samimi

Ghamarian

et al. 2014

JOM

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“…The addition of refractory elements such as Nb, Ta, Mo, W, Zr, or Hf was found effective. The beneficial effect of Nb was widely published (Ref [1][2][3][4][5][6][7][8][9][10]. Nb atoms are located exclusively on Ti sites for the equilibrium phases present in Nb-containing c-TiAl alloys ( Ref 2,4,6,9,10).…”

Section: Introductionmentioning

confidence: 99%

“…Extensive research has been conducted for years on the oxidation behavior of c-TiAl alloys (Ref [1][2][3][4][5][6][7][8]. Thanks to a low density ($4 g/cm 3 ) and specific properties similar to that of Nibased superalloys, c-TiAl alloys are of particular interest for the production of rotating parts in gas turbine aero-engines and automotive turbochargers (Ref 1-5, 7, 9).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, low ductility and fracture toughness are often recorded which is a serious concern for structural use especially in the aeronautics industry. In addition, c-TiAl alloys experience rather severe oxidation over 700°C forming a non-protective mixed scale (Ref [1][2][3][4][5][6][7]9).…”

Section: Introductionmentioning

confidence: 99%

“…While microstructure has little influence on the oxidation resistance (though Becker et al (Ref 10) suggested that Al is preferentially oxidized in a two phase structure), the chemical composition (i.e., the nature and content of alloying elements) might be optimized to increase oxidation resistance and maintain a good balance of properties (Ref [1][2][3][4][5][6][7]9). The poor oxidation resistance of c-TiAl alloys is attributed to the lack of protective alumina scales and deleterious rapid growth of rutile ( 6).…”

Section: Introductionmentioning

confidence: 99%

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Initial Oxidation Behavior in Air of TiAl-2Nb and TiAl-8Nb Alloys Produced by Electron Beam Melting

Terner

Biamino

Baudana

et al. 2015

J. of Materi Eng and Perform

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Titanium aluminide alloys are good candidates for structural applications thanks to their low density and good balance of properties up to relatively high temperatures. However, their application is still limited by significant oxidation. Four c-TiAl alloys with different content of aluminum and niobium were produced by electron beam melting: Ti-45Al-2Cr-2Nb, Ti-48Al-2Cr-2Nb, Ti-45Al-2Cr-8Nb, and Ti-46Al-2Cr-8Nb. The behavior of these alloys in response to oxidation in air during constant heating up to 1000°C and isothermal oxidation for 10 h at 850 and 950°C were studied by thermogravimetric analysis. The mass gain due to oxidation of the low Nb-containing alloys was always at least twice that of the high Nbcontaining alloys. Both low and high Nb-containing alloys exhibited on their surface oxidation products of the same nature: oxides TiO 2 and Al 2 O 3 , and nitrides TiN and Ti 2 AlN. Niobium addition up to 8 at.% did not suppress the growth of rutile and promote the formation of a protective alumina layer. However, it efficiently reduced the formation of rutile, mainly responsible for the mass gain due to oxidation of c-TiAl alloys and with tendency to spallation.

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The effect of Ta additions on the oxidation resistance of SPS-produced TiAl alloys

Cobbinah

Matizamhuka

Machaka

et al. 2020

Int J Adv Manuf Technol

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Scale composition and oxidation mechanism of the Ti–46Al–8Nb alloy in air at 700 and 800 °C

Cited by 35 publications

References 60 publications

Discovery via Integration of Experimentation and Modeling: Three Examples for Titanium Alloys

Discovery via Integration of Experimentation and Modeling: Three Examples for Titanium Alloys

Initial Oxidation Behavior in Air of TiAl-2Nb and TiAl-8Nb Alloys Produced by Electron Beam Melting

The effect of Ta additions on the oxidation resistance of SPS-produced TiAl alloys

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