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Low Temperature Positron Lifetime and Doppler Broadening Measurements in B2-type FeAl Alloys

Published online by Cambridge University Press:  21 March 2011

Tomohide Haraguchi ,
Fuminobu Hori ,
Ryuichiro Oshima  and
Mineo Kogachi
Tomohide Haraguchi
Affiliation:
Graduate School of Science, Osaka Prefecture University, Sakai 599–8531, Japan.
Fuminobu Hori
Affiliation:
Research Institute for Advanced Science and Technology, Osaka Prefecture University, Sakai 599–8570, Japan.
Ryuichiro Oshima
Affiliation:
Research Institute for Advanced Science and Technology, Osaka Prefecture University, Sakai 599–8570, Japan.
Mineo Kogachi
Affiliation:
College of Integrated Arts and Sciences, Osaka Prefecture University, Sakai 599–8531, Japan.
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Abstruct

Positron lifetime and Doppler broadening measurements were carried out at a low temperature, 100K, for B2-type intermetallic compounds FeAl with composition ranges from 41.2 to 50.7 at%Al systematically in order to clarify the feature of lattice defects of the alloys. Quenching temperature dependences of positron lifetimes ranging from 573 to 1173 K was examined for alloys with 41.2, 49.0 and 50.7 at%Al. Two lifetime component analyses could not be made except for a few spectra, indicating a saturation trapping of positrons at atomic vacancies. The mean positron lifetimes are in a range of 175–195 psec, which are not corresponding to vacancy clusters but to mono and/or di-vacancies. The tendency for S-parameter to increase with increase in Al content was found. This suggests that such an increase of S-parameters is attributed to change in the fraction of atoms around the vacancies, not to increase in vacancy concentration.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N5.5.1
Copyright
Copyright © Materials Research Society 2001

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References

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