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Influence of cyclic thermal treatments on the oxidation behavior of Ti-6Al-2Sn-4Zr-2Mo alloy
Universitat Politècnica de Catalunya, CIEFMA/EEBE, Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Barcelona, 08019, Spain. Centre for Research in Multiscale Engineering of Barcelona, Universitat Politècnica de Catalunya, Campus Diagonal Besòs-EEBE, Barcelona, 08019, Spain.
Universitat Politècnica de Catalunya, CIEFMA/EEBE, Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Barcelona, 08019, Spain. Centre for Research in Multiscale Engineering of Barcelona, Universitat Politècnica de Catalunya, Campus Diagonal Besòs-EEBE, Barcelona, 08019, Spain.
Universitat Politècnica de Catalunya, CIEFMA/EEBE, Departament de Ciència dels Materials i Enginyeria Metal·lúrgica, Barcelona, 08019, Spain. Centre for Research in Multiscale Engineering of Barcelona, Universitat Politècnica de Catalunya, Campus Diagonal Besòs-EEBE, Barcelona, 08019, Spain. University of Erlangen-Nuremberg, Institute for Surface Science and Corrosion, Department of Materials Science and Engineering, Erlangen, D-91058, Germany.
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0002-7675-7152
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2018 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 145, p. 218-224Article in journal (Refereed) Published
Abstract [en]

Ti-6Al-2Sn-4Zr-2Mo is one of the most common titanium alloys for aerospace industry. This alloy experiences oxidation phenomenon at elevated temperatures. In the present study, cyclic thermal treatments were performed in air at 500, 593 and 700 °C, up to 500 cycles, in order to determine the oxidation kinetics and to analyze the oxide scale and alpha-case formation. Moreover, results were compared to those achieved under isothermal conditions to elucidate differences between both thermal conditions. In this sense, metallographic techniques and X-ray diffraction, together with a detailed advanced characterization of the microstructure by Field Emission Scanning Electron Microscopy and Focus Ions Beam, were used to analyze surface oxidation evolution. Results pointed out that cyclic treatments induced a strong increase of the weight gain compared to isothermal treatments. The analysis of the oxide scale revealed the formation of not only rutile, as isothermal treatments, but also anatase. Thickness of the oxide scale was higher for cyclic conditions, while alpha case did not exceed values reached by isothermal treatments and even became lower at 500 °C.

Place, publisher, year, edition, pages
2018. Vol. 145, p. 218-224
Keywords [en]
Aerospace industry, Aluminum alloys, Field emission microscopes, Heat treatment, Isotherms, Metallography, Molybdenum alloys, Oxidation, Oxide minerals, Scale (deposits), Scanning electron microscopy, Tin alloys, Titanium, Titanium dioxide, Zirconium alloys, Alpha case, Elevated temperature, Field emission scanning electron microscopy, Isothermal conditions, Isothermal treatment, Metallographic technique, Oxidation behaviors, Surface oxidations, Titanium alloys
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Production Technology
Identifiers
URN: urn:nbn:se:hv:diva-12955DOI: 10.1016/j.matchar.2018.08.049ISI: 000449449200023Scopus ID: 2-s2.0-85052644847OAI: oai:DiVA.org:hv-12955DiVA, id: diva2:1251359
Funder
Swedish Foundation for Strategic Research
Note

Funders inisterio de Economía y Competitividad (MINECO/FEDER), MAT2015-70780-C4-3-P;  Erasmus Mundus Programme through the European Joint Doctoral Programme in Materials Science and Engineering Programme (DocMASE, Grant number 512225-1-2010-1-DE-ERA MUNDUS-EMJD.

Available from: 2018-09-27 Created: 2018-09-27 Last updated: 2019-05-27Bibliographically approved

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