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Deformation induced alpha and epsilon martensites in Fe-Ni-Cr single crystals

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Abstract

The orientation dependence of an applied tensile stress on the formation of specific α martensite variants of the Kurdjumov-Sachs (K-S) orientation relationship in Fe-15Ni-15Cr single crystals are presented. Test temperatures were 185, 242 and 273 K,i.e., aboveM s. Quantitative volume fraction measurements of deformation induceda ande martensite were made on crystals with the [100]γ, [1•10]γ, [•1•12]γ and [•2•13]γ tensile axes, α-martensite was only observed after 5 pct strain at 185K in all orientations, but the total volume fraction ofa martensite varied from <0.002 to 0.07 for the [100]γ and [•2•13]γ tensile axes respectively. The distribution of the K-S variants was also found to be sensitive to the direction of the applied stress, and 80 pet of the α martensite present in crystals oriented for easy glide had the same K-S variant. Epsilon martensite was found in all specimens but occurred only in the (111) planes which had slipped.

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Authors and Affiliations

  1. South Dakota School of Mines and Technology, Rapid City

    Glen Stone (Associate Professor of Metallurgy)

  2. Department of Materials Science and Engineering, University of California, 94720, Berkeley, Cal.

    Gareth Thomas (Professor)

Authors
  1. Glen Stone
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  2. Gareth Thomas
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Glen Stone, formerly graduate student, University of California at Berkeley

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Stone, G., Thomas, G. Deformation induced alpha and epsilon martensites in Fe-Ni-Cr single crystals. Metall Trans 5, 2095–2102 (1974). https://doi.org/10.1007/BF02644503

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