Positron Lifetime Study of Electron Irradiated Ti&lt;SUB&gt;3&lt;/SUB&gt;Al

Shirai, Yoshihito; Murakami, Takashi; Ogawa, Naoki; Yamaguchi, M.

doi:10.2320/jinstmet1952.59.5_590

Cited by 3 publications

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“…[7][8][9][10][11][12] Its detection limit is of the order of 10 −6 in atomic fraction, which is 3 orders of magnitude lower than that of the method 13) combined the XRD and density measurements. It is therefore effective in investigating the defect structure, particularly in the Corich CoAl, where the constitutional vacancies have been reported by some researchers 3,4) not to be formed.…”

Section: Introductionmentioning

confidence: 99%

Positron Lifetime Study of Defect Structures in B2 Ordered Co-Al Alloys

et al. 2002

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The positron lifetimes in the B2 intermetallic compounds Co 100−X Al X (X = 46.9 to 54.1) water-quenched, air-and furnace-cooled from high temperatures have been measured to reveal their defect structures. The positron mean lifetime depends entirely on the composition, irrespective of the cooling rate, and steadily increases from 161 to 180 ps as the Al concentration increases from 46.9 to 54.1 at%. A waterquenched Co 53.1 Al 46.9 was isochronally annealed for 900 s successively at 25 K intervals up to 1073 K, but its positron lifetime remained unchanged by the annealing. These results clearly show that vacancies are formed not only on the Co-sites but also on the Al-sites, and the total vacancy concentration is more than 10 −4 in both the Co-rich and the Al-rich CoAl. It was furthermore found that the population ratio of Al-vacancies to Co-vacancies gradually increases with the Co concentration, and the number of Al-vacancies is comparable with that of Co-vacancies in the vicinity of stoichiometric composition.

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Section: Introductionmentioning

confidence: 99%

Positron Lifetime Study of Defect Structures in B2 Ordered Co-Al Alloys

et al. 2002

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Study of the Quenched Defects in TiAl Alloy by Positron Annihilation

Wang

Zhang

Wang

et al. 1997

phys. stat. sol. (a)

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The recovery behavior of quenched‐in defects in TiAl alloys was studied by positron annihilation lifetime measurements. The results indicate that there is a certain number of grain boundaries in fully annealed TiAl samples, and after being quenched, the samples contain quite a lot of secondary defects such as vacancy clusters besides a large amount of mono‐vacancies. The vacancy clusters aggregate further in the temperature range from 300 to 600 °C due to the impurity atoms.

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