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Pseudoelastic Behavior of Fe3Ga Single Crystals with D03 Structure

Published online by Cambridge University Press:  26 February 2011

Hiroyuki Y. Yasuda ,
Mitsuhiro Aoki ,
Kouki Fukushima  and
Yukichi Umakoshi
Hiroyuki Y. Yasuda
Affiliation:
[email protected], Osaka University, Research Center for Ultra-High Voltage Electron Microscopy, 7-1, Mihogaoka, Ibaraki, Osaka, 567-0047, Japan, 81-6-6879-7496, 81-6-6879-7497
Mitsuhiro Aoki
Affiliation:
[email protected], Osaka University, Division of Materials and Manufacturing Science, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan
Kouki Fukushima
Affiliation:
[email protected], Osaka University, Division of Materials and Manufacturing Science, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan
Yukichi Umakoshi
Affiliation:
[email protected], Osaka University, Division of Materials and Manufacturing Science, 2-1, Yamada-oka, Suita, Osaka, 565-0871, Japan
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Abstract

Pseudoelastic behavior of Fe3Ga single crystals regardless of a thermoelastic martensitic transformation was investigated focusing on the dislocation structure and the phase constituent. Large pseudoelasticity of 5 % recoverable strain appeared in Fe3Ga single crystals sufficiently annealed in the D03 single-phase region. In the crystals, uncoupled and paired 1/4[111] superpartial dislocations moved dragging the nearest-neighbor (NN) and next-nearest neighbor (NNN) anti-phase boundaries (APBs) during loading, respectively. During unloading, these APBs pulled back the superpartials resulting in large pseudoelasticity, which is similar to D03-ordered Fe3Al crystals. The dislocation configuration was closely related to the ordered domain structure developed in the D03 phase. Moreover, the precipitation of the thermally stable L12 phase was so slow that the metastable D03 phase developed even if the crystals were annealed in the (a+ L12) and (D03+ L12) phase fields in Fe-Ga equilibrium phase diagram. The metastable D03 phase also demonstrated large pseudoelasticity of which recovery ratio was above 80 %. On the other hand, if the L12 phase precipitated by long time annealing in the (a+ L12) region, the reversible motion of 1/4[111] superpartials was suppressed by the L12 phase resulting in a decrease in recovery ratio. In addition, the crystals aged in the (a+ D03) phase region showed small strain recovery.

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-II06-08
Copyright
Copyright © Materials Research Society 2007

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