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Mechanical behavior of a bulk nanostructured iron alloy

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Abstract

Bulk, fully dense materials were prepared from Fe-10Cu with grain diameters between 45 nm and 1.7 µm. The materials were prepared by ball milling of powders in a glove box, followed by hot isostatic pressing (hipping) or powder forging. Larger grain sizes were obtained by thermal treatment of the consolidated powders. The bulk materials were relatively clean, with oxygen levels below 1500 wpm and other contaminants less than 0.1 at. pct. The mechanical behavior of these materials was unique. At temperatures from 77 to 470 K, the first and only mechanism of plastic deformation was intense shear banding, which was accompanied by a perfectly plastic stress-strain response (absence of strain hardening). There was a large tension-compression asymmetry in the strength, and the shear bands did not occur on the plane of maximum shear stress or the plane of zero extension. This behavior, while unusual for metals, has been observed in amorphous polymers and metallic glasses. On the other hand, the fine-grained Fe-10Cu materials behaved like coarse-grained iron in some respects, particularly by obeying the Hall-Petch equation with constants reasonably close to those of pure iron and by exhibiting low-temperature mechanical behavior which was very similar to that of steels. Transmission electron microscopy (TEM) studies found highly elongated grains within shear bands, indicating that shear banding occurred by a dislocation-based mechanism, at least at grain sizes above 100 nm. Similarities and differences between the fine-grained Fe-10Cu and metals, polymers, metallic glasses, radiation-damaged metals, and quench-damaged metals are discussed.

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Author notes

  1. J. E. Carsley (Graduate Student, Senior Research Engineer)

    Present address: Department of Metallurgical and Materials Engineering, Michigan Technological University, 49931, Houghton, MI

Authors and Affiliations

  1. General Motors, NAO Technical Center, 48090, Warren, MI

    J. E. Carsley (Graduate Student, Senior Research Engineer)

  2. Robert Bosch Corporation, 29418, Charleston, SC

    A. Fisher (Graduate Student, Materials Engineer)

  3. Department of Metallurgical and Materials Engineering, Michigan Technological University, 49931, Houghton, MI

    A. Fisher (Graduate Student, Materials Engineer) & W. W. Milligan (Professor)

  4. Department of Mechanical Engineering and Engineering Mechanics, Michigan Technological University, 49931, Houghton, MI

    E. C. Aifantis (Professor)

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  1. J. E. Carsley
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  2. A. Fisher
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  3. W. W. Milligan
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  4. E. C. Aifantis
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Additional information

This article is based on a presentation made in the symposium “Mechanical Behavior of Bulk Nanocrystalline Solids,” presented at the 1997 Fall TMS Meeting and Materials Week, September 14–18, 1997, in Indianapolis, Indiana, under the auspices of the Mechanical Metallurgy (SMD), Powder Materials (MDMD), and Chemistry and Physics of Materials (EMPMD/SMD) Committees.

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Carsley, J.E., Fisher, A., Milligan, W.W. et al. Mechanical behavior of a bulk nanostructured iron alloy. Metall Mater Trans A 29, 2261–2271 (1998). https://doi.org/10.1007/s11661-998-0104-3

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