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{011} Twinning in Fe-Ni-C martensites

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Abstract

The substructures of two Fe-Ni-C alloys that form platelike martensite have been studied by transmission electron microscopy (TEM). Planar features with a {011 } habit are observed, in addition to the usual {112 } transformation twins and arrays of screw dislocations. The results of diffraction-contrast experiments are consistent with these {011 } defects being fine twins within which the carbon atoms occupy a different octahedral interstitial sublattice from the surrounding matrix. In any given martensitic plate, this twinning appears to occur preferentially on the {011 } plane containing the same {111 } direction as the operative {112 } transformation-twinning variant. The possibility that {011 } twinning occurs during the martensitic transformation and/or when virgin martensite is heated from subambient temperatures is discussed in relation to crystallographic observables such as the martensitic habit plane and axial ratios.

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Authors and Affiliations

  1. Bethlehem Steel Corporation, 18016, Bethlehem, PA

    K. A. Taylor (Research Engineer)

  2. Department of Materials Science and Engineering, Northwestern University, 60208, Evanston, IL

    G. B. Olson (Professor)

  3. Massachusetts Institute of Technology, 02139, Cambridge, MA

    M. Cohen (Institute Professor Emeritus) & J. B. Vander Sande (Professor)

Authors
  1. K. A. Taylor
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  2. G. B. Olson
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  3. M. Cohen
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  4. J. B. Vander Sande
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The tetragonal symmetry of martensite dictates that the absolute value of the underlined index be fixed when obtaining equivalent crystallographic variants. Small contractions along the αa- andb-axes accompany the expansion along thec-axis. formerly with the Massachusetts Institute of Technology, formerly with the Massachusetts Institute of Technology

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Taylor, K.A., Olson, G.B., Cohen, M. et al. {011} Twinning in Fe-Ni-C martensites. Metall Trans A 20, 2739–2747 (1989). https://doi.org/10.1007/BF02670167

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  • DOI: https://doi.org/10.1007/BF02670167

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