Continuous atomic displacements and lattice distortions during martensitic transformations in fcc-bcc-hcp systems

  title={Continuous atomic displacements and lattice distortions during martensitic transformations in fcc-bcc-hcp systems},
  author={Cyril Cayron},
  • C. Cayron
  • Published 25 February 2015
  • Materials Science
Band structure theory of the bcc to hcp Burgers distortion
The Burgers distortion is a two-stage transition between body centered cubic (BCC) and hexagonal close-packed (HCP) structures. Refractory metal elements from the Sc and Ti columns of the periodic
Deformation-induced phase transformation and twinning in Fe and Fe–C alloys
The phase transformations and twinning in a nano-sized face-centred cubic (FCC) crystal of iron with different carbon contents are studied by molecular dynamic (MD) simulations. The simulation cells
Molecular dynamics simulation of phase competition in terbium.
It is found that the liquid supercooled below the hcp melting temperature has both bcc and hcp/fcc nuclei, but only the bCC nuclei grow such that theLiquid always solidifies into the bcc phase, even at temperatures where the hCP phase is more stable.
What EBSD and TKD Tell Us about the Crystallography of the Martensitic B2-B19′ Transformation in NiTi Shape Memory Alloys
The complex and intricate microstructure of B19′ martensite in shape memory nickel titanium alloys is generally explained with the Phenomenological Theory of Martensitic Crystallography (PTMC). Over
On the evolving nature of c/a ratio in a hexagonal close-packed epsilon martensite phase in transformative high entropy alloys
A unique twin-bridging mechanism was observed, which provided experimental evidence supporting existing theoretical predictions; i.e., geometrical factors combined with grain orientation, c/a ratio and plastic deformation can result in characteristic twin boundary inclination at 45–50°.
The transformation matrices (distortion, orientation, correspondence), their continuous forms and their variants.
  • C. Cayron
  • Mathematics
    Acta crystallographica. Section A, Foundations and advances
  • 2019
The crystallography of displacive/martensitic phase transformations can be described with three types of matrix: the lattice distortion matrix, the orientation relationship matrix and the correspondence matrix, and an explanation is offered of how to deduce the matrices of inverse transformation.
Evolution of Face-Centered Cubic Ti Alloys Transformation by X-ray Diffraction Profile Analysis in Mechanical Alloying
Four titanium alloys (Ti-Ta, Ti-Ta-Sn, Ti-Ta-Mn, and Ti-Nb-Sn) were synthesized by mechanical alloying (MA) in a planetary mill in different times between 2 h and 100 h. The microstructure