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Hot stage TEM investigations of dislocation climb in NiAl

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Abstract

Hot stage was used to investigate dislocation loop formation and growth at climb sources in Al rich alloys of β-NiAl. The loops grew by absorbing vacancies retained during cooling of the samples. The growth rate was dependent on the speed of cooling and anomalously high growth of loops occurred near the foil surfaces. The loop shapes were nearly square as a result of loop growth by a jog mechanism. Estimates of the vacancy concentration contained in the loops after growth demonstrated that nearly all thermal vacancies can be retained in NiAl.

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Authors and Affiliations

  1. Department of Biological Materials, Northwestern University, Chicago, IL

    G. W. Marshall (Assistant Professor)

  2. Department of Materials Science and Engineering and the Materials Research Center, Northwestern University, Evanston, IL

    J. O. Brittain (Professor)

Authors
  1. G. W. Marshall
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  2. J. O. Brittain
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Marshall, G.W., Brittain, J.O. Hot stage TEM investigations of dislocation climb in NiAl. Metall Trans A 7, 1013–1020 (1976). https://doi.org/10.1007/BF02644067

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  • DOI: https://doi.org/10.1007/BF02644067

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