About: Thermal vacancies in Fe(3)Al studied by positron annihilation

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rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://www.sciencedirect.com/science/article/pii/S1359645411001789
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. (en)
Title	Thermal vacancies in Fe(3)Al studied by positron annihilation Thermal vacancies in Fe(3)Al studied by positron annihilation (en)
skos:prefLabel	Thermal vacancies in Fe(3)Al studied by positron annihilation Thermal vacancies in Fe(3)Al studied by positron annihilation (en)
skos:notation	RIV/00216208:11320/11:10103796!RIV12-GA0-11320___
http://linked.open...avai/predkladatel	Matematicko-fyzikální fakulta
http://linked.open...avai/riv/aktivita	P S Z
http://linked.open...avai/riv/aktivity	P(GAP108/11/1350), P(GP106/08/P133), P(KAN300100801), S, Z(MSM0021620834)
http://linked.open...iv/cisloPeriodika	10
http://linked.open...vai/riv/dodaniDat	2012
http://linked.open...aciTvurceVysledku	Lukáč, František Kužel, Radomír Melikhova, Oksana Procházka, Ivan Čížek, Jakub
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Univerzita Karlova v Praze / Matematicko-fyzikální fakulta
http://linked.open...dnocenehoVysledku	235195
http://linked.open...ai/riv/idVysledku	RIV/00216208:11320/11:10103796
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Positron annihilation; Non-destructive testing; Vacancies; Lattice defects; Iron aluminides (en)
http://linked.open.../riv/klicoveSlovo	Lattice defects Vacancies Positron annihilation Iron aluminides Non-destructive testing
http://linked.open...odStatuVydavatele	NL - Nizozemsko
http://linked.open...ontrolniKodProRIV	[6416EFCB6FED]
http://linked.open...i/riv/nazevZdroje	Acta Materialia
http://linked.open...in/vavai/riv/obor	BM
http://linked.open...ichTvurcuVysledku	5 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Multifunctional bulk metallic materials with nanocrystalline and ultrafine-grained structure Effects of cores and boundaries of nanograins on structural and physical properties of ball milled and mechanically alloyed iron-based materials. Investigation of vacancies in Fe-Al based alloys
http://linked.open...UplatneniVysledku	2011
http://linked.open...v/svazekPeriodika	59
http://linked.open...iv/tvurceVysledku	Lukáč, František Melikhova, Oksana Procházka, Ivan Čížek, Jakub Kužel, Radomír
http://linked.open...ain/vavai/riv/wos	000291119700028
http://linked.open...n/vavai/riv/zamer	Condensed Matter Physics – New Materials and Technologies
issn	1359-6454
number of pages	11 (xsd:int)
http://bibframe.org/vocab/doi	10.1016/j.actamat.2011.03.031
http://localhost/t...ganizacniJednotka	11320
is http://linked.open...avai/riv/vysledek of	Thermal vacancies in Fe(3)Al studied by positron annihilation Thermal vacancies in Fe(3)Al studied by positron annihilation

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