A positron investigation of electron-irradiation induced defects in γ-TiAl intermetallic compounds

Autor:	O. Dimitrov, C. Dimitrov, G. Sattonnay, C. Corbel
Rok vydání:	1999
Předmět:	Positron Materials science Mechanics of Materials Mechanical Engineering Vacancy defect Metallurgy Materials Chemistry Metals and Alloys Electron beam processing Intermetallic General Chemistry Irradiation Molecular physics
Zdroj:	Intermetallics. 7:23-31
ISSN:	0966-9795
Popis:	The isochronal recovery of irradiation induced defects was investigated in γ-TiAl intermetallic compounds (with 50 and 54 at% Al) by positron lifetime measurements after 2.5 MeV electron irradiation at 21 K. In the as-irradiated condition, the analysis of the results and the comparison with published data led to a value τd=230±5 ps for the lifetime of vacancy-trapped positrons. The lifetime variations observed during isochronal anneals at increasing temperatures are consistent with vacancy migration around 450 K. The observation of a progressive decrease in the lifetime of trapped positron, during the migration and elimination of vacancies, suggests that they do not form unrelaxed three-dimensional clusters, and that another type of positron traps is simultaneously present.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::2230de03366bda24dbc7d01423d4befa https://doi.org/10.1016/s0966-9795(98)00007-7 Zobrazit plný text záznamu Full Text from ScienceDirect