Relaxation process in quenched-in vacancies during annealing in B2 FeAl single crystals

Tomohide Haraguchi, Fuminobu Hori, Kyosuke Yoshimi, Shuji Hanada, Ryuichiro Oshima, Akihiro Iwase, Hitoshi Hashimoto

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Citation (Scopus)

Abstract

Coincidence Doppler broadening (CDB) technique and position lifetime measurement were used to investigate the relaxation process in quenched-in vacancies during annealing in Fe-48mol%Al single crystals quenched from 1373 K. The electron momentum curve of the as-quenched FeAl normalized by the pure Fe curve obtained from CDB was analogous to that of pure Al. After annealing at 673 K for 86.4 ks, the shape of the momentum curve became similar to that of pure Fe when normalized by pure AL These results suggest that vacancies on Al-sublattice sites were newly created during relaxation of quenched-in vacancies. The CDB and the positron annihilation measurements show that positron trapping sites are constricted after annealing at 873 K for 60 s and 673 K for 86.4 ks, and retained vacancies migrate under these heat treatment conditions. It is suggested that these vacancies change into secondary defects having smaller open volumes than the vacancies, e.g., sessile dislocations, stacking fault tetrahedras and so on.

Original languageEnglish
Title of host publicationPositron Annihilation
Subtitle of host publicationProceedings of the 13th International Conference on Positron Annihilation, ICPA-13
EditorsToshio Hyodo, Haruo Saito, Yoshinori Kobayashi, Yasuyuki Nagashima
PublisherTrans Tech Publications Ltd
Pages99-101
Number of pages3
ISBN (Print)9780878499366
DOIs
Publication statusPublished - 2004 Jan 1
EventPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13 - Kyoto, Japan
Duration: 2003 Sep 72003 Sep 12

Publication series

NameMaterials Science Forum
Volume445-446
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

OtherPositron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13
CountryJapan
CityKyoto
Period03/9/703/9/12

Keywords

  • Coincidence Doppler Broadening
  • FeAl
  • Positron Lifetime
  • Relaxation Process
  • Vacancies

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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