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Microstructure and mechanical properties of two-phase Fe30Ni20Mn20Al30. Part I: Microstructure

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Abstract

The microstructure of Fe30Ni20Mn20Al30 in both the as-cast condition and after annealing at 823 K for various times up to 72 h was characterized using transmission electron microscopy, scanning transmission electron microscopy, synchrotron-based X-ray diffraction, and atom probe tomography. The microstructure exhibited a basketweave morphology of (Mn, Fe)-rich B2-ordered (ordered b.c.c.) and (Ni, Al)-rich L21-ordered (Heusler type) phases with a lattice misfit of only 0.85 % and interfaces aligned along 〈100〉. The phase width increased from 5 nm for the as-cast alloy to 25 nm for 72 h annealed material, with no change in the elemental partitioning between the phases, with a time exponent for the coarsening kinetics of 0.19. Surprisingly, it was found that the room temperature hardness was largely independent of the phase width.

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Acknowledgements

This research was supported by the US Department of Energy (DOE), Office of Basic Energy Sciences grant DE-FG02-07ER46392 (X. W and I. B). Research was supported ORNL’s ShaRE User Facility, which is sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy (M. K. M. and K. L. M.). Use of the Advanced Photon Source, an Office of Science User Facility operated for the U.S. Department of Energy (DOE) Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357 (Z. C. and S. C.). The authors gratefully acknowledge K. F. Russell for technical assistance. Prof. Paul Munroe of the University of New South Wales is thanked for the electron probe microanalyzer measurements. We would also like to thanks the reviewers for their numerous useful comments. The views and conclusions contained herein are those of the authors and should not be interpreted as necessarily representing official policies, either expressed or implied of the DOE or the U.S. Government.

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Authors and Affiliations

  1. Thayer School of Engineering, Dartmouth College, Hanover, NH, 03755-8000, USA

    X. Wu & I. Baker

  2. Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    M. K. Miller & K. L. More

  3. X-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA

    Z. Cai & S. Chen

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  1. X. Wu
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Correspondence to I. Baker.

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Wu, X., Baker, I., Miller, M.K. et al. Microstructure and mechanical properties of two-phase Fe30Ni20Mn20Al30. Part I: Microstructure. J Mater Sci 48, 7435–7445 (2013). https://doi.org/10.1007/s10853-013-7558-4

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  • DOI: https://doi.org/10.1007/s10853-013-7558-4

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