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The effect of annealing on deformation and fracture of a nanocrystalline fcc metal

  • Nano May 2006
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Abstract

The tensile deformation and fracture behavior of electrodeposited nanocrystalline Ni–15% Fe alloy samples after annealing for 90 min at 250, 400 and 500 °C temperatures were investigated. The structure of the samples was studied using TEM and XRD techniques and the fracture surfaces were investigated employing SEM. The results of this study indicated that annealing at 250 °C modified grain size distribution slightly but resulted in a significant increase in the initial strain hardening rate. While the average grain size in the 400 °C sample was increased to 59 nm, its yield strength was comparable to the as-deposited alloy with a 9 nm grain size. The plastic tensile elongation of all annealed samples was lowered significantly to less than 1% from approximately 6% in the as-deposited state. These results are discussed in terms of the inhomogeneity of plastic deformation and the evolution of internal stresses in nanocrystalline materials.

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Acknowledgements

Financial support for this research was provided by the National Science Foundation under the grant DMR-9980213 and DMR-0605406.

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Author notes

  1. Hongqi Li

    Present address: Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, USA

Authors and Affiliations

  1. Materials Science and Engineering Department, University of Florida, Gainesville, 32607, USA

    Fereshteh Ebrahimi & Hongqi Li

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  1. Fereshteh Ebrahimi
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  2. Hongqi Li
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Correspondence to Fereshteh Ebrahimi.

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Ebrahimi, F., Li, H. The effect of annealing on deformation and fracture of a nanocrystalline fcc metal. J Mater Sci 42, 1444–1454 (2007). https://doi.org/10.1007/s10853-006-0969-8

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