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Formation of invariant plane-strain and tent-shaped surface reliefs by the diffusional ledge mechanism

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Abstract

Electron channeling contrast and electron backscattering patterns (EBSPs), generated in scanning electron microscopes (SEMs), were used to study the question of whether tent-shaped surface reliefs associated with ferrite plates in Fe-0.07 pct and Fe-0.50 pct C low-alloy steels are single crystals or back-to-back pairs of plates. Although more than 50 ferrite plates were examined in detail, any misorientation contained within them must have been <1 deg. Additionally, no sightings of the low-angle grain boundaries approximately bisecting ferrite plates expected on the back-to-back plates mechanism were ever made. The efforts of previous investigators to explain tent-shaped (and invariant plane-strain) reliefs on the basis of diffusional ledgewise growth were further extended.

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Author notes

  1. H. I. Aaronson

    Present address: Physical Metallurgy Branch, Code 6320, The Naval Research Laboratory, 20375- 5343, Washington, DC

Authors and Affiliations

  1. School of Metallurgy and Materials, University of Birmingham, B15 2TT, Birmingham, UK

    M. G. Hall (Lecturer)

  2. Geo-Centers, Inc., Ft. Washington, MD

    H. I. Aaronson

Authors
  1. M. G. Hall
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  2. H. I. Aaronson
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Additional information

This article is based on a presentation made at the Pacific Rim Conference on the “Roles of Shear and Diffusion in the Formation of Plate-Shaped Transformation Products,” held December 18-22, 1992, in Kona, Hawaii, under the auspices of ASM INTERNATIONAL’S Phase Transformations Committee.

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Hall, M.G., Aaronson, H.I. Formation of invariant plane-strain and tent-shaped surface reliefs by the diffusional ledge mechanism. Metall Mater Trans A 25, 1923–1931 (1994). https://doi.org/10.1007/BF02649040

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