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Statements

Subject Item
n2:RIV%2F00216208%3A11320%2F14%3A10288541%21RIV15-MSM-11320___
rdf:type
n3:Vysledek skos:Concept
rdfs:seeAlso
http://dx.doi.org/10.1007/s10853-013-7946-9
dcterms:description
We have investigated the potential self-healing of deformation-induced defects by Au precipitation during isothermal aging at 550 A degrees C in Fe-Au and Fe-Au-B-N alloys using positron annihilation spectroscopy. Two different samples with 0 and 24 % pre-strain were used to study the influence of dislocations on the Au precipitation. Dislocations introduced prior to the aging process play an essential role in the formation of Au precipitates. The Coincidence Doppler broadening (CDB) technique shows that Au precipitation in the matrix occurs in the pre-strained samples only. TEM observations confirm the heterogeneous nature of the Au precipitation which occurs exclusively on dislocations and grain boundaries. The evolution of S and W parameters derived from the CDB indicates a three-stage precipitation process for the pre-strained samples. Both the hardness tests and the positron annihilation spectroscopy indicate that the addition of boron and nitrogen to the Fe-Au alloy causes a deceleration of the Au precipitation in the pre-strained samples, but does not alter the defect-induced mechanism of the Au precipitation. The defect-induced Au precipitation provides a promising site-specific autonomous repair mechanism to extend the lifetime of Fe-based alloys for high temperature structural applications. We have investigated the potential self-healing of deformation-induced defects by Au precipitation during isothermal aging at 550 A degrees C in Fe-Au and Fe-Au-B-N alloys using positron annihilation spectroscopy. Two different samples with 0 and 24 % pre-strain were used to study the influence of dislocations on the Au precipitation. Dislocations introduced prior to the aging process play an essential role in the formation of Au precipitates. The Coincidence Doppler broadening (CDB) technique shows that Au precipitation in the matrix occurs in the pre-strained samples only. TEM observations confirm the heterogeneous nature of the Au precipitation which occurs exclusively on dislocations and grain boundaries. The evolution of S and W parameters derived from the CDB indicates a three-stage precipitation process for the pre-strained samples. Both the hardness tests and the positron annihilation spectroscopy indicate that the addition of boron and nitrogen to the Fe-Au alloy causes a deceleration of the Au precipitation in the pre-strained samples, but does not alter the defect-induced mechanism of the Au precipitation. The defect-induced Au precipitation provides a promising site-specific autonomous repair mechanism to extend the lifetime of Fe-based alloys for high temperature structural applications.
dcterms:title
Positron annihilation study on deformation-induced Au precipitation in Fe-Au and Fe-Au-B-N alloys Positron annihilation study on deformation-induced Au precipitation in Fe-Au and Fe-Au-B-N alloys
skos:prefLabel
Positron annihilation study on deformation-induced Au precipitation in Fe-Au and Fe-Au-B-N alloys Positron annihilation study on deformation-induced Au precipitation in Fe-Au and Fe-Au-B-N alloys
skos:notation
RIV/00216208:11320/14:10288541!RIV15-MSM-11320___
n4:aktivita
n7:I n7:P
n4:aktivity
I, P(GBP108/12/G043)
n4:cisloPeriodika
6
n4:dodaniDat
n17:2015
n4:domaciTvurceVysledku
n13:9949097
n4:druhVysledku
n11:J
n4:duvernostUdaju
n20:S
n4:entitaPredkladatele
n12:predkladatel
n4:idSjednocenehoVysledku
37718
n4:idVysledku
RIV/00216208:11320/14:10288541
n4:jazykVysledku
n10:eng
n4:klicovaSlova
irradiation; dislocation; microstructure; vacancy; alpha-iron; lifetime spectroscopy; pressure-vessel steels; severe plastic-deformation; austenitic stainless-steel; creep cavitation resistance
n4:klicoveSlovo
n5:severe%20plastic-deformation n5:austenitic%20stainless-steel n5:microstructure n5:lifetime%20spectroscopy n5:irradiation n5:creep%20cavitation%20resistance n5:vacancy n5:alpha-iron n5:dislocation n5:pressure-vessel%20steels
n4:kodStatuVydavatele
US - Spojené státy americké
n4:kontrolniKodProRIV
[1FC58F577723]
n4:nazevZdroje
Journal of Materials Science
n4:obor
n9:BM
n4:pocetDomacichTvurcuVysledku
1
n4:pocetTvurcuVysledku
7
n4:projekt
n18:GBP108%2F12%2FG043
n4:rokUplatneniVysledku
n17:2014
n4:svazekPeriodika
49
n4:tvurceVysledku
Čížek, Jakub Bruck, E. van der Zwaag, S. Zhang, S. van Dijk, N. H. Schut, H. Tichelaar, F. D.
n4:wos
000329833000011
s:issn
0022-2461
s:numberOfPages
10
n16:doi
10.1007/s10853-013-7946-9
n19:organizacniJednotka
11320