Irradiation behaviour of α2 and γ phases in He ion implanted titanium aluminide alloy

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DOIResolve DOI: http://doi.org/10.1016/j.intermet.2014.02.005
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TypeArticle
Journal titleIntermetallics
ISSN0966-9795
Volume50
Pages2833; # of pages: 6
SubjectDefects: constitutional vacancies; F. Electron microscopy , transmission; Hexagonal close packed; Interstitial migration; Irradiation effect; Microstructural examination; Titanium aluminide alloy; Titanium aluminides , based on TiAl; Helium; Ions; Irradiation; Niobium; Radiation damage; Titanium; Titanium alloys
AbstractA Ti-45Al-2Nb-2Mn + 0.8 vol.% TiB2 (at.%) alloy with fully lamellar microstructure consisting of hexagonal-close-packed (hcp) α2 and face-centred-tetragonal (fct) γ phases was irradiated by implanting helium ions to different fluences. Microstructural examination showed that helium cavities are formed in both the α2 and γ phases after He-ion irradiation. However, the helium cavities and their size change with fluence are much larger in the α2 phase than those in the γ phase, indicating that the γ phase exhibits better tolerance to the He-ion irradiation than the α2 phase. Since α2 and γ phases have different crystal structures, they possess differences in helium solubility and interstitial migration. These differences are responsible for the variation in radiation damage behaviour between the two phases. © 2014 Elsevier Ltd. All rights reserved.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); Aerospace (AERO-AERO)
Peer reviewedYes
NPARC number21272145
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Record identifierf379eba5-70f7-429b-becc-21372b1bc43b
Record created2014-07-23
Record modified2016-05-09
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