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Effects of Dislocation and Microstructure on Pseudoelasticity in D03-Type Fe3Al Single Crystals

Published online by Cambridge University Press:  26 February 2011

Yukichi Umakoshi ,
Takashi Nakajima  and
Hiroyuki Y. Yasuda
Yukichi Umakoshi
Affiliation:
umakoshi@mat.eng.osaka-u.ac.jp, Osaka University, Division of Materials and Manufacturing Science, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan, 81-6-6879-7494, 81-6-6879-7495
Takashi Nakajima
Affiliation:
takashi.nakajima@mat.eng.osaka-u.a.jp, Osaka University, Division of Materials and Manufacturing Science, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan
Hiroyuki Y. Yasuda
Affiliation:
hyyasuda@mat.eng.osaka-u.ac.jp, Osaka University, Research Center for Ultra-High Voltage Electron Microscopy, 7-1, Mihogaoka, Ibaraki, Osaka, 567-0047, Japan
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Abstract

New type pseudoelasticity in Fe3Al with the D03 structure was examined using the single crystals. The pseudoelasticity occurred due to a reversible motion of 1/4<111> superpartials dragging the nearest-neighbor anti-phase boundaries. The chemical composition and microstructure of Fe3Al alloys strongly influenced the shape recovery ratio and Fe-23.0at%Al alloy with fine domain structure was the most favorable for the appearance of the pseudoelasticity. The recovery ratio of Fe-23.0at%Al exceeded 80 % in the wide temperature range from -50 to 200 oC.

Keywords

dislocationstransmission electron microscopy (TEM)Fe
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II01-06
Copyright
Copyright © Materials Research Society 2007

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