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Deformation substructure and slip systems in directionally solidified Ni3Al(γ’)-Ni3Nb(δ)

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Abstract

At strains ≳5 x 10-3, the 2 μmγ’ lamellae deformed by dislocation multiplication on those few slip systems with unobstructed paths for screw dislocations together with slip on those other systems which could subsequently become active through cross slip.b was mainly «110» (on {111} and {100}) at 25°C and «100» (on {100} and {110}) at 300 to 600°C. The influence of the composite environment on γ’ was viewed as the restriction of multiplication leading to severe exhaustion hardening and limited load transfer to δ. Larger deformations at 300 to 600°C were achieved through formation of 211 twins in 5 which generated γ’ deformation bands with dominant slip systems (b = «110» on {100} and {111}) determined by both compatibility and dislocation mobility requirements for accommodation of the large (0.4) twin shear. The bands then provided the dislocation sources for the remainder of the γ’.

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Authors and Affiliations

  1. Institute of Materials Science, University of Connecticut, 06268, Storrs, CT

    P. R. Bhowal (Research Associate)

  2. Department of Metallurgy and Mining Engineering and Materials Research Laboratory, University of Illinois at Urbana-Champaign, 61801, Urbana, IL

    M. Metzger (Professor of Physical Metallurgy)

Authors
  1. P. R. Bhowal
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  2. M. Metzger
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Bhowal, P.R., Metzger, M. Deformation substructure and slip systems in directionally solidified Ni3Al(γ’)-Ni3Nb(δ). Metall Trans A 9, 1027–1038 (1978). https://doi.org/10.1007/BF02652207

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  • DOI: https://doi.org/10.1007/BF02652207

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