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Determination of dislocation density and stacking fault probability from X-ray powder pattern peak profiles

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Abstract

An analysis of X-ray powder pattern peaks of plastically deformed fcc metals and alloys allows the determination of the stacking fault probability α and the dislocation density ρ. The changes in position of the peak maxima are produced by residual or applied stresses ρ, by α, and by a redistribution of the alloying elements, whereas the broadening of the peak profiles results from the reduction of the size of the coherently diffracting domains, from the microstains ∈, and from α. Values of ρ are deduced from ∈, and α is correlated with the faulted area in the cold worked crystals. ρ/α is directly proportional to the stacking fault energy γ. Estimates of the proportionality constant are made which lead to values of γ consistent with dislocation node measurements.

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Author information

Authors and Affiliations

  1. Needham Laboratories, Brunswick Corp., Needham, Mass.

    R. P. I. Adler

  2. Materials Research Laboratory, Martin Marietta Corp., Orlando, Fla.

    H. M. Otte

  3. Materials Department, University of California, Los Angeles, Cal.

    C. N. J. Wagner

Authors
  1. R. P. I. Adler
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  2. H. M. Otte
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  3. C. N. J. Wagner
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Additional information

C. N. J. WAGNER, formerly Associate Professor, Hammond Laboratory, Yale University

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Adler, R.P.I., Otte, H.M. & Wagner, C.N.J. Determination of dislocation density and stacking fault probability from X-ray powder pattern peak profiles. Metall Trans 1, 2375–2382 (1970). https://doi.org/10.1007/BF03038366

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