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

G. B. Olson*, Morris Cohen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

133 Scopus citations

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 observed M 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 elec-tron microscopy. The faults are observed at the types of sites where the required dislo-cation groups are expected. These include grain boundaries, incoherent twin boundaries, and inclusion particle interfaces. Having defined the function of a nucleation site, mecha-nisms of strain induced nucleation and autocatalysis are then considered.

Original languageEnglish (US)
Pages (from-to)1905-1914
Number of pages10
JournalMetallurgical Transactions A
Volume7
Issue number11
DOIs
StatePublished - Nov 1 1976

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials

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