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Oxidation and alpha–case formation in Ti–6Al–2Sn–4Zr–2Mo alloy
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-7675-7152
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0003-3661-9262
2015 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 99, p. 166-174Article in journal (Refereed) Published
Abstract [en]

Isothermal heat treatments in ambient air were performed on wrought Ti–6Al–2Sn–4Zr–2Mo (Ti–6242) material at 500, 593 and 700 °C for times up to 500 hours. In presence of oxygen at elevated temperatures simultaneous reactions occurred in Ti–6242 alloy, which resulted in formation of an oxide scale and a layer with higher oxygen concentration (termed as alpha–case). Total weight gain analysis showed that there was a transition in the oxidation kinetics. At 500 °C, the oxidation kinetics obeyed cubic relationship up to 200 hours and thereafter changed to parabolic at prolonged exposure times. At 593 °C, it followed parabolic relationship. After heat treatment at 700 °C, the oxidation obeyed parabolic relationship up to 200 hours and thereafter changed to linear at prolonged exposure times. The observed transition is believed to be due to the differences observed in the oxide scale. The activation energy for parabolic oxidation was estimated to be 157 kJ/mol. In addition, alpha–case layer was evaluated using optical microscope, electron probe micro analyser and microhardness tester. The thickness of the alpha–case layer was found to be a function of temperature and time, increasing proportionally, and following parabolic relationship. The activation energy for formation of alpha–case layer was estimated to be 153 kJ/mol.

Place, publisher, year, edition, pages
2015. Vol. 99, p. 166-174
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Other Materials Engineering
Research subject
Engineering Materials
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URN: urn:nbn:se:ltu:diva-4759DOI: 10.1016/j.matchar.2014.11.023ISI: 000350085900020Scopus ID: 2-s2.0-84918826061Local ID: 2bfd5cde-715d-4aab-b9f2-d582de42ab5fOAI: oai:DiVA.org:ltu-4759DiVA, id: diva2:977633
Note
Validerad; 2015; Nivå 2; 20141120 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Gaddam, RaghuveerSefer, BirhanPederson, RobertAntti, Marta-Lena

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