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An in situ experimental study of grain growth in a nanocrystalline Fe91Ni8Zr1 alloy

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Abstract

Grain growth and microstructural evolution of thermally stabilized Fe91Ni8Zr1 were investigated by in situ and ex situ studies. Our investigations suggest that the microstructural evolution is fairly slow and the microstructure shows stabilization up to about 700 °C. Above this temperature, a certain fraction of grains grow abnormally into the nanocrystalline matrix, resulting in a bimodal microstructure and causing the complete loss of thermal stability. The reason for abnormal grain growth and the loss of thermal stability is identified as the appearance of the fcc γ-phase and consequent reduction in the total area of grain boundaries and the overall stored energy.

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Abbreviations

M :

Grain boundary mobility

Q :

Activation energy

ν :

Velocity of grain boundary

D :

Grain diameter

h :

Specimen thickness

δD:

Incremental growth

δG :

Change in volume free energy

δГ s :

Change in surface energy

δГ i/gb :

Change in the interphase energy-grain boundary energy

A s :

Free surface area

A i :

Grain interface area

V :

Volume of grains

g :

Bulk free energy per volume

Г s :

Surface energy per area

Г i :

α-to-γ interface energy per area

Г gb :

Grain boundary energy per area

P :

Pressure acting on the grain interfaces

\( \tilde{D} \) :

Diffusivity

D o :

Frequency factor

r :

Diffusion distance

t :

Annealing time

T :

Annealing temperature

R :

Gas constant

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Acknowledgements

The research reported in this paper was supported by NSF-DMR under grant number 1005677.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, NC State University, 911 Partners Way, Room 3002, Raleigh, NC, 27695-7907, USA

    Hasan Kotan, Mostafa Saber, Ronald O. Scattergood & Carl C. Koch

  2. U.S. Army Research Laboratory, Weapons and Materials Research Directorate, RDRL-WMM-F, Aberdeen Proving Ground, Aberdeen, MD, 21005-5069, USA

    Kris A. Darling

Authors
  1. Hasan Kotan
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  2. Kris A. Darling
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  3. Mostafa Saber
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  4. Ronald O. Scattergood
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  5. Carl C. Koch
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Correspondence to Hasan Kotan.

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Kotan, H., Darling, K.A., Saber, M. et al. An in situ experimental study of grain growth in a nanocrystalline Fe91Ni8Zr1 alloy. J Mater Sci 48, 2251–2257 (2013). https://doi.org/10.1007/s10853-012-7002-1

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