The influence of elastic strain on the early stages of decomposition in Cu–1.7at% Fe

Handle URI:
http://hdl.handle.net/10754/575666
Title:
The influence of elastic strain on the early stages of decomposition in Cu–1.7at% Fe
Authors:
Rademacher, Thomas; Al-Kassab, Talaat; Kirchheim, Reiner
Abstract:
The initial stage of decomposition of homogenized Cu-1.7 at% Fe at 722 K was investigated by means of field ion microscopy (FIM), atom probe tomography (APT) and computer-assisted field ion image tomography (cFIIT). The agglomeration of atoms depending on time could be investigated and the growth of precipitates with a diameter of few nanometers was observed during ongoing nucleation. For the cFIIT measurements, an improved reconstruction algorithm was developed. Employing cFIIT in combination with FIM images, alignments of precipitates mainly in < 100 > directions were found. Besides, a general experimental concept to evaluate strain-related effects on the position of the proximate precipitate will be introduced. These analyses of the APT and cFIIT data show tendencies of a preferred < 100 > directed configuration as well. This effect can be associated with the elastic anisotropy of the Cu matrix (f.c.c.) to accommodate the volume misfit of precipitates. In accordance with previous model calculations, a preferred nucleation in < 100 > directions with respect to existing clusters can be concluded. For such cluster arrangements strain energy reduction is largest for precipitates adapting their sizes. Thus, additional stabilization against coarsening can be inferred for < 100 > alignments which result in the observed effects. (C) 2008 Published by Elsevier B.V.
KAUST Department:
Materials Science and Engineering Program
Publisher:
Elsevier BV
Journal:
Ultramicroscopy
Issue Date:
Apr-2009
DOI:
10.1016/j.ultramic.2008.09.009
Type:
Article
ISSN:
0304-3991
Appears in Collections:
Articles; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorRademacher, Thomasen
dc.contributor.authorAl-Kassab, Talaaten
dc.contributor.authorKirchheim, Reineren
dc.date.accessioned2015-08-24T08:35:23Zen
dc.date.available2015-08-24T08:35:23Zen
dc.date.issued2009-04en
dc.identifier.issn0304-3991en
dc.identifier.doi10.1016/j.ultramic.2008.09.009en
dc.identifier.urihttp://hdl.handle.net/10754/575666en
dc.description.abstractThe initial stage of decomposition of homogenized Cu-1.7 at% Fe at 722 K was investigated by means of field ion microscopy (FIM), atom probe tomography (APT) and computer-assisted field ion image tomography (cFIIT). The agglomeration of atoms depending on time could be investigated and the growth of precipitates with a diameter of few nanometers was observed during ongoing nucleation. For the cFIIT measurements, an improved reconstruction algorithm was developed. Employing cFIIT in combination with FIM images, alignments of precipitates mainly in < 100 > directions were found. Besides, a general experimental concept to evaluate strain-related effects on the position of the proximate precipitate will be introduced. These analyses of the APT and cFIIT data show tendencies of a preferred < 100 > directed configuration as well. This effect can be associated with the elastic anisotropy of the Cu matrix (f.c.c.) to accommodate the volume misfit of precipitates. In accordance with previous model calculations, a preferred nucleation in < 100 > directions with respect to existing clusters can be concluded. For such cluster arrangements strain energy reduction is largest for precipitates adapting their sizes. Thus, additional stabilization against coarsening can be inferred for < 100 > alignments which result in the observed effects. (C) 2008 Published by Elsevier B.V.en
dc.publisherElsevier BVen
dc.titleThe influence of elastic strain on the early stages of decomposition in Cu–1.7at% Feen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.identifier.journalUltramicroscopyen
dc.contributor.institutionUniv Gottingen, Inst Mat Phys, D-37077 Gottingen, Germanyen
kaust.authorAl-Kassab, Talaaten
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