Mobility of the β1 1 martensitic interface in Cu-Al-Ni: Part I. Experimental measurements

M. Grujicic*, G. B. Olson, W. S. Owen

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

60 Scopus citations

Abstract

The mobility of the β 1 1 martensitic interface in thermoelastic β-Cu-Al-Ni alloys has been investigated using stress-assisted single interface transformation over the temperature range 180 to 410 K. The imposed interfacial velocities varied between 10-6 and 10-2 ms-1. The kinetic behavior is found to be consistent with thermally-activated interfacial motion, although an anomalous temperature dependence is observed below 210 K. This low temperature anomaly is attributed to the effect of the experimentally verified elastic softening. At higher temperatures, measured activation energies of 1.5 × 10-20 to 3.5 × 10-20 J and activation volumes of 103 to 104 atomic volumes are rationalized in terms of the rate-controlling interaction of the moving interface with fine-scale lattice displacements, the tweed structure, observed by transmission electron microscopy. Coarse particles of γ- and 2H-phase, detected by the TEM, are found to give rise to noncontact particle/interface interactions which are too long-range to be surmounted by thermal activation. Consequently, they produce athermal friction stresses opposing interface motion.

Original languageEnglish (US)
Pages (from-to)1723-1734
Number of pages12
JournalMetallurgical Transactions A
Volume16
Issue number10
DOIs
StatePublished - Oct 1 1985

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Metals and Alloys
  • Mechanics of Materials
  • Engineering(all)

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