Abstract
Geometric surface relief effects have been observed in association with the γ→α allotropic transformation in iron. The selected-area electron channelling pattern technique has been used to establish that tent shaped geometric relief effects, common to single α precipitate plates in Fe-C and Fe-C-X alloys, are also associated with similar single crystal morphologies in pure iron. These experimental observations extend to the allotropic transformation in iron the same rationale for the relationship of interfacial structure to surface relief effects that is known to apply in the instance of precipitation reactions. In addition it provides support for an earlier proposal that “massive” transformations can be subject to the same crystallographic constraints as precipitation processes.
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Kinsman, K.R., Richman, R.H. & Verhoeven, J.D. Geometric surface relief and the allotropic transformation in iron. J Mater Sci 11, 1487–1493 (1976). https://doi.org/10.1007/BF00540882
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DOI: https://doi.org/10.1007/BF00540882