ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
TiAl-based alloys have attractive properties as light weight heat-resisting material. In thepresent work, the influence of Cu, Zn, Ag and Se on the oxidation behavior of TiAl wasinvestigated by ion implantation at acceleration voltage of 50 kV and ion doses of 1019 to 2x1021ions/m2. The oxidation behavior was assessed by a cyclic oxidation test at 1200 K in a flow ofpurified oxygen under atmospheric pressure. The oxidation products were analyzed by conventionalmethods including X-ray diffractometry, SEM and EPMA. The implantation of Zn and Cu improvesthe oxidation resistance significantly by forming virtually Al2O3 scales, while Ag and Se enhancethe oxidation. The improvement by Zn is attributable to the formation of complex oxide of Zn in theinitial stage of oxidation. The oxygen partial pressure under the layer seems to be very low,resulting in the formation of alumina scale due to a selective oxidation of Al. The influence of Cu isnot certain. The influence of Ag and Se is explained in terms of Al depletion in the implanted layer
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.522-523.633.pdf
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