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Effect of Heat Treatment on the Ductility of Ni(γ)/Ni3Al(γ') Two-phase Alloy Foils

Published online by Cambridge University Press:  26 February 2011

Motonori Nakamura ,
Masahiko Demura ,
Ya Xu  and
Toshiyuki Hirano
Motonori Nakamura
Affiliation:
[email protected], University of Tsukuba, Graduate School of Pure and Applied Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 3050047, Japan
Masahiko Demura
Affiliation:
[email protected], National Institute for Materials Science, Fuel Cell Materials Center, 1-2-1 Sengen, Tsukuba, Ibaraki, 3050047, Japan
Ya Xu
Affiliation:
[email protected], National Institute for Materials Science, Fuel Cell Materials Center, 1-2-1 Sengen, Tsukuba, Ibaraki, 3050047, Japan
Toshiyuki Hirano
Affiliation:
[email protected], National Institute for Materials Science, Fuel Cell Materials Center, 1-2-1 Sengen, Tsukuba, Ibaraki, 3050047, Japan
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Abstract

The microstructures and room-temperature tensile properties were examined in the 95% cold-rolled and subsequently heat-treated foils of the boron-free Ni(γ)/Ni3Al(γ') two-phase (Ni-18at.%Al) alloys. The electron backscatter diffraction measurements revealed that the recrystallization started at 873 K/0.5 h and that it completed at 1273 K/0.5 h. While the foils showed no tensile elongation in the cold-rolled state, they became ductile after the heat-treatments at 873 K and above. The tensile elongation increased with the increasing heat-treatment temperature: it reached to 14% at 1273 K/0.5 h. The tensile elongation and the fracture strength were high, compared to those in the γ' single-phase foils. The fracture mode was intergranular, and it changed to a mix of intergranular and transgranular in the foils heat-treated at 1273 K/0.5 h, where the area fraction of crack resistant boundaries such as °1, °3 and °9 was high, 0.63. The high ductility was ascribed to the existence of the ductile γ matrix and to the high fraction of crack-resistant boundaries.

Keywords

AlmicrostructureNi
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 980: Symposium II – Advanced Intermetallic-Based Alloys , 2006 , 0980-II05-30
Copyright
Copyright © Materials Research Society 2007

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References

1. Demura, M, Suga, Y, Umezawa, O, George, EP, Hirano, T. Intermetallics 2001;9:157.Google Scholar
2. Demura, M, Kisida, K, Suga, Y, Hirano, T. Metall Mater Trans A 2002;33A:2607.Google Scholar
3. Demura, M, Kisida, K, Suga, Y, Takanashi, M, Hirano, T. Scripta Mater 2002;47: 267.Google Scholar
4. Borodians' Ka, H, Demura, M, Kisida, K, Hirano, T. Intermetallics 2002;10:255.Google Scholar
5. Li, D, Demura, M, Kisida, K, Suga, Y, Hirano, T. Mat. Rec. Symp. Proc 2003;753: BB5.23.1.Google Scholar
6. Beardmore, P, Davies, RG, Johnston, TL, Transactions of the Metallurgical Society of AIME 1969;245:1537.Google Scholar
7. Harada, H, Yamazaki, M, Koizumi, Y, Testsu-to-Hagane 1979;65:1049.Google Scholar
8. Aoki, K, Izumi, O. Trans Jim 1978;19:203.Google Scholar
9. Cui, C, Demura, M, Kisida, K, Hirano, T. J Mater Research 2005;20:1054 Google Scholar
10. Su, JQ, Demura, M, Hirano, T. Philos. Mag. 2002;82:1541 Google Scholar