The Martensitic Transformation in Indium-Thallium Alloys

  • T. R. Finlayson
  • G. J. McIntyre
  • K. C. Rule
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)


The martensitic transformation in indium-thallium alloys is reviewed with a focus on the nature of the transformation as has been investigated using elastic and lattice vibrational properties. Recent measurements from thermal-neutron Laue and cold-neutron, triple-axis experiments are presented in an attempt to ratify the traditional explanation for the transformation as being driven by phonon softening for low-ζ \( \left[ {\upzeta \upzeta 0} \right]\left[ {{\upzeta{{ \bar{\upzeta }}}}0} \right] \) (i.e., T1) phonons. No evidence for phonon softening has been found to as low as ζ = 0.02 reciprocal lattice units on the T1 phonon branch. An alternative mechanism is advanced, for the transformation involving nucleation and growth on {111} planes, which appears to be consistent with electron diffuse scattering in the system. Such a mechanism is also consistent with the transition being driven by the electronic free energy of the system, as has been demonstrated by other properties.


Indium-thallium alloys Phonon dispersion Transformation mechanism 



Access to neutron beamtime at the Australian Centre for Neutron Scattering through proposal nos. P4814 and DB6030 is acknowledged. One of us (TRF) also acknowledges resources provided by The University of Melbourne where he is an Honorary Principal Fellow.


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Copyright information

© The Minerals, Metals & Materials Society 2018

Authors and Affiliations

  • T. R. Finlayson
    • 1
  • G. J. McIntyre
    • 2
  • K. C. Rule
    • 2
  1. 1.Department of Chemical and Biomolecular EngineeringThe University of MelbourneMelbourneAustralia
  2. 2.Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology OrganisationSydneyAustralia

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