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Erschienen in: Metallurgical and Materials Transactions A 3/2011

01.03.2011 | Symposium: Structural Transitions and Local Deformation Processes at and near Grain Boundaries

In-Situ Scanning Electron Microscopy/Electron Backscattered Diffraction Observation of Microstructural Evolution during α → γ Phase Transformation in Deformed Fe-Ni Alloy

verfasst von: Tatsuya Fukino, Sadahiro Tsurekawa, Yasuhiro Morizono

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 3/2011

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Abstract

This article presents in-situ observation of ferrite (α)/austenite (γ) phase transformation in an Fe-8.5 at. pct Ni alloy deformed by rolling using an automated scanning electron microscopy/energy backscattered diffraction (SEM/EBSD) system. During heating, recrystallization in α phase and α → γ phase transformation independently occurred. The γ grains nucleated in unrecrystallized α grains were most probably incorporated into the grain interior of recrystallized α grains. They did not have any specific orientation relation (OR) with recrystallized α grains and grew in an isotropic manner. On the other hand, the intragranular γ grains nucleated in recrystallized α grains had a Kurdjumov–Sachs (K-S) OR with the α grains and grew in a considerably anisotropic manner. They preferentially grew along the common direction of surface traces of {110} α /{111} γ . Approximately half of grain boundary (GB) allotriomorphs had either the K-S OR or the Nishiyama–Wasserman (N-W) OR with the parent α grains. The γ allotriomorphs predominantly grew into the α grain having the special OR with themselves. The GB character distribution of γ phase at high temperatures was measured. The fraction of CSL boundaries was as high as 63 pct, particularly that of Σ3 grain boundaries (GBs) was 54 pct.

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Fußnoten
1
A GB has 5 deg of freedom. An EBSD software can only determine three crystallographic requirements (rotation axis and misorientation). Additional two requirements associated with GB plane are not determined by the EBSD software only.
 
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Metadaten
Titel
In-Situ Scanning Electron Microscopy/Electron Backscattered Diffraction Observation of Microstructural Evolution during α → γ Phase Transformation in Deformed Fe-Ni Alloy
verfasst von
Tatsuya Fukino
Sadahiro Tsurekawa
Yasuhiro Morizono
Publikationsdatum
01.03.2011
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 3/2011
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-010-0285-4

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