TY - GEN
T1 - Relaxation process in quenched-in vacancies during annealing in B2 FeAl single crystals
AU - Haraguchi, Tomohide
AU - Hori, Fuminobu
AU - Yoshimi, Kyosuke
AU - Hanada, Shuji
AU - Oshima, Ryuichiro
AU - Iwase, Akihiro
AU - Hashimoto, Hitoshi
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2004
Y1 - 2004
N2 - 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.
AB - 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.
KW - Coincidence Doppler Broadening
KW - FeAl
KW - Positron Lifetime
KW - Relaxation Process
KW - Vacancies
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U2 - 10.4028/www.scientific.net/msf.445-446.99
DO - 10.4028/www.scientific.net/msf.445-446.99
M3 - Conference contribution
AN - SCOPUS:3142749288
SN - 9780878499366
T3 - Materials Science Forum
SP - 99
EP - 101
BT - Positron Annihilation
A2 - Hyodo, Toshio
A2 - Saito, Haruo
A2 - Kobayashi, Yoshinori
A2 - Nagashima, Yasuyuki
PB - Trans Tech Publications Ltd
T2 - Positron Annihilation: Proceedings of the 13th International Conference on Positron Annihilation, ICPA-13
Y2 - 7 September 2003 through 12 September 2003
ER -