Protection of Ti-alloys against high temperature environmental attack by a two step process, aluminization + fluorination
Protection of Ti-alloys against high temperature environmental attack by a two step process, aluminization + fluorination
Donchev, A.; Galetz, M.; Schütze, M.; Yankov, R.; Kolitsch, A.
Ti-alloys cannot be used at elevated temperatures above approximately 600°C in oxidizing environments. They suffer from accelerated oxidation and oxygen uptake in the subsurface zone, which deteriorates the mechanical properties. The addition of Al (usually < 10%) into standard Ti-alloys is not enough to form a protective alumina layer. Aluminization of technical Ti-alloys and formation of intermetallic Al-rich phases (e.g. TiAl3) change the oxidation behavior from fast and non-protective rutile formation to slow growing alumina kinetics, but only for a limited period of time. A subsequent fluorination of the aluminized components gets the fluorine effect to operate. This is away to improve the resistance of technical Ti-alloys against environmental attack, even for longer service times. In this paper the results of high temperature oxidation tests of several untreated and treated Ti-alloys will be presented and their behavior compared.
Keywords: Environmental embrittlement; Fluorine effect; Oxidation
Involved research facilities
- Ion Beam Center DOI: 10.17815/jlsrf-3-159
Related publications
- DOI: 10.17815/jlsrf-3-159 is cited by this (Id 20987) publication
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Contribution to proceedings
TMS 2014 143rd TMS Annual Meeting 2014, 16.-20.02.2014, San Diego, United States
TMS 2014 Supplemental Proceedings, 9781118889725, 79-85
DOI: 10.1002/9781118889879
Permalink: https://www.hzdr.de/publications/Publ-20987