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Microstructures and Mechanical Behavior of Bulk Nanocrystalline γ–Ni–Fe Produced by a Mechanochemical Method

Published online by Cambridge University Press:  31 January 2011

X. Y. Qin ,
J. S. Lee  and
C. S. Lee
X. Y. Qin*
Affiliation:
Laboratory of Internal Friction and defects in Solids, Institute of Solid State Physics Academia Sinica, 230031 Hefei, People's Republic of China
J. S. Lee
Affiliation:
Department of Metallurgy and Material Science, Hanyang University, 425–791 Ansan, Korea
C. S. Lee
Affiliation:
Department of Metallurgy and Material Science, Hanyang University, 425–791 Ansan, Korea
*
a)Address all correspondence to this author. e-mail: xyqine@mail.issp.ac.cn
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Extract

The microstructures and mechanical behavior of bulk nanocrystalline γ–Ni–xFe (n-Ni–Fe) with x = ∼19–21 wt%, synthesized by a mechanochemical method plus hot-isostatic pressing, were investigated using microstructural analysis [x-ray diffraction, energy-dispersive spectroscopy, light emission spectrum, atomic force microscopy (AFM), and optical microscopy (OM)], and mechanical (indentation and compression) tests, respectively. The results indicated that the yield strength (σ0.2) of n-Ni–Fe (d ∼ 33 nm) is about 13 times greater than that of conventional counterpart. The change of yield strength with grain size was basically in agreement with Hall–Petch relation in the size range (33–100 nm) investigated. OM observations demonstrated the existence of two sets of macroscopic bandlike deformation traces mostly orienting at 45–55° to the compression axis, while AFM observations revealed that these bandlike traces consist of ultrafine lines. The cause for high strength and the possible deformation mechanisms were discussed based on the characteristics of microstructures and deformation morphology of n-Ni–Fe.

Type
Articles
Information
Journal of Materials Research , Volume 17 , Issue 5 , May 2002 , pp. 991 - 1001
Copyright
Copyright © Materials Research Society 2002

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