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A general mechanism of martensitic nucleation: Part II. FCC → BCC and other martensitic transformations

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Abstract

The general mechanism of martensitic nucleation by faulting from groups of existing dislocations, as proposed in Part I, is applied to the fcc → bcc, bcc → fcc, bcc → hcp, and related transformations, including mechanical twinning. Where thermodynamic data are available, the conditions at the observedM s temperatures are consistent with nucleation from a defect composed of four or five properly spaced lattice dislocations. Examples of nucleation by faulting on the planes predicted are found in published electron microscopy. The faults are observed at the types of sites where the required dislocation groups are expected. These include grain boundaries, incoherent twin boundaries, and inclusion particle interfaces. Having defined the function of a nucleation site, mechanisms of strain induced nucleation and autocatalysis are then considered.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139

    G. B. Olson (Research Associate) & Morris Cohen (Institute Professor)

Authors
  1. G. B. Olson
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  2. Morris Cohen
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Additional information

This paper is Part II of a three-part series based on a thesis submitted by G. B. Olson for the degree of Sc.D. in Metallurgy at the Massachusetts Institute of Technology in June 1974.

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Olson, G.B., Cohen, M. A general mechanism of martensitic nucleation: Part II. FCC → BCC and other martensitic transformations. Metall Trans A 7, 1905–1914 (1976). https://doi.org/10.1007/BF02659823

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  • DOI: https://doi.org/10.1007/BF02659823

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