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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F11%3A10103796%21RIV12-GA0-11320___
rdf:type
skos:Concept n18:Vysledek
rdfs:seeAlso
http://www.sciencedirect.com/science/article/pii/S1359645411001789
dcterms:description
Vacancies in Fe(3)Al intermetallic alloys were investigated by positron annihilation spectroscopy combined with X-ray diffraction. Two complementary techniques of positron annihilation were employed: positron lifetime spectroscopy and coincidence Doppler broadening. The experimental results were combined with ab initio theoretical calculations of positron characteristics. It was found that Fe(3)Al quenched from 1000 degrees C exhibits a mainly disordered A2 structure. Defects in the as-quenched sample were identified as Fe vacancies on the A sub-lattice surrounded by A1 nearest neighbors. The concentration of quenched-in vacancies was determined from the positron lifetime results. The samples were subsequently subjected to isochronal annealing which enabled an investigation of the recovery of quenched-in vacancies and the formation of thermal vacancies in B2 phase. It was found that recovery of quenched-in vacancies is accompanied by ordering to the D0(3) structure. The enthalpy and entropy of formation were determined for vacancies in the B2 phase. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved. Vacancies in Fe(3)Al intermetallic alloys were investigated by positron annihilation spectroscopy combined with X-ray diffraction. Two complementary techniques of positron annihilation were employed: positron lifetime spectroscopy and coincidence Doppler broadening. The experimental results were combined with ab initio theoretical calculations of positron characteristics. It was found that Fe(3)Al quenched from 1000 degrees C exhibits a mainly disordered A2 structure. Defects in the as-quenched sample were identified as Fe vacancies on the A sub-lattice surrounded by A1 nearest neighbors. The concentration of quenched-in vacancies was determined from the positron lifetime results. The samples were subsequently subjected to isochronal annealing which enabled an investigation of the recovery of quenched-in vacancies and the formation of thermal vacancies in B2 phase. It was found that recovery of quenched-in vacancies is accompanied by ordering to the D0(3) structure. The enthalpy and entropy of formation were determined for vacancies in the B2 phase. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
dcterms:title
Thermal vacancies in Fe(3)Al studied by positron annihilation Thermal vacancies in Fe(3)Al studied by positron annihilation
skos:prefLabel
Thermal vacancies in Fe(3)Al studied by positron annihilation Thermal vacancies in Fe(3)Al studied by positron annihilation
skos:notation
RIV/00216208:11320/11:10103796!RIV12-GA0-11320___
n18:predkladatel
n19:orjk%3A11320
n3:aktivita
n7:S n7:P n7:Z
n3:aktivity
P(GAP108/11/1350), P(GP106/08/P133), P(KAN300100801), S, Z(MSM0021620834)
n3:cisloPeriodika
10
n3:dodaniDat
n10:2012
n3:domaciTvurceVysledku
n6:7072589 n6:6715869 n6:5586992 n6:9949097 n6:7037945
n3:druhVysledku
n8:J
n3:duvernostUdaju
n17:S
n3:entitaPredkladatele
n20:predkladatel
n3:idSjednocenehoVysledku
235195
n3:idVysledku
RIV/00216208:11320/11:10103796
n3:jazykVysledku
n13:eng
n3:klicovaSlova
Positron annihilation; Non-destructive testing; Vacancies; Lattice defects; Iron aluminides
n3:klicoveSlovo
n11:Non-destructive%20testing n11:Positron%20annihilation n11:Lattice%20defects n11:Iron%20aluminides n11:Vacancies
n3:kodStatuVydavatele
NL - Nizozemsko
n3:kontrolniKodProRIV
[6416EFCB6FED]
n3:nazevZdroje
Acta Materialia
n3:obor
n16:BM
n3:pocetDomacichTvurcuVysledku
5
n3:pocetTvurcuVysledku
5
n3:projekt
n4:GP106%2F08%2FP133 n4:KAN300100801 n4:GAP108%2F11%2F1350
n3:rokUplatneniVysledku
n10:2011
n3:svazekPeriodika
59
n3:tvurceVysledku
Lukáč, František Procházka, Ivan Kužel, Radomír Čížek, Jakub Melikhova, Oksana
n3:wos
000291119700028
n3:zamer
n12:MSM0021620834
s:issn
1359-6454
s:numberOfPages
11
n21:doi
10.1016/j.actamat.2011.03.031
n15:organizacniJednotka
11320