Angular distortive matrices of phase transitions in the fcc–bcc–hcp system

@article{Cayron2016AngularDM,
  title={Angular distortive matrices of phase transitions in the fcc–bcc–hcp system},
  author={Cyril Cayron},
  journal={Acta Materialia},
  year={2016},
  volume={111},
  pages={417-441}
}
  • C. Cayron
  • Published 1 June 2016
  • Physics
  • Acta Materialia
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
Dislocation Induced FCC Twins at the HCP/FCC Interfaces in a Deformed Ti-5Al Alloy: Experiments and Simulations
This paper proposes a new formation route for the face-centered cubic (FCC) twins at the hexagonal close-packed (HCP)/FCC interface in a deformed Ti-5at.%Al alloy. From the experimental results, an
Shifting the Shear Paradigm in the Crystallographic Models of Displacive Transformations in Metals and Alloys
Deformation twinning and martensitic transformations are characterized by the collective displacements of atoms, an orientation relationship, and specific morphologies. The current crystallographic
Hard-sphere displacive model of extension twinning in magnesium
Hard-sphere displacive model of deformation twinning in hexagonal close-packed metals. Revisiting the case of the (56°, a) contraction twins in magnesium.
  • C. Cayron
  • Materials Science
    Acta crystallographica. Section A, Foundations and advances
  • 2017
TLDR
A new displacive model in line with previous work on martensitic transformations and extension twinning is proposed, which proves that the distortion is not a simple shear when it is considered in its continuity.
Twinning is not shearing: Case of the extension twins in magnesium
A crystallographic model is proposed for the extension twins in magnesium. It is based on a hard-sphere assumption previously used for martensitic transformations, and it reverses the approach of the
The transformation matrices (distortion, orientation, correspondence), their continuous forms and their variants.
  • C. Cayron
  • Mathematics
    Acta crystallographica. Section A, Foundations and advances
  • 2019
TLDR
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.
Over the shear paradigm
Deformation twinning and martensitic transformations are displacive transformations; they are defined by high speed collective displacements of the atoms, the existence of a parent/daughter
A Cayley Graph Description of the Symmetry Breaking Associated with Deformation and Structural Phase Transitions in Metallic Materials
  • Yipeng Gao
  • Materials Science
    SSRN Electronic Journal
  • 2019
Deformation and structural phase transitions are typical physical processes, which can produce variety types of defects (e.g., twinning and dislocation) in metals and alloys. Those crystalline
...
1
2
3
...

References

SHOWING 1-10 OF 99 REFERENCES
Continuous atomic displacements and lattice distortion during fcc–bcc martensitic transformation
Theory of the martensitic transformation in cobalt
A phenomenological theory of the martensitic fcc-hcp transformation is proposed and applied to the illustrative example of cobalt. The fcc and hcp structures are shown to result from different
Application of the theory of martensite crystallography to displacive phase transformations in substitutional nonferrous alloys
It has been demonstrated that the theory of martensite crystallography is capable of accounting successfully for the form and crystallography of a range of plate- or lath-shaped transformation
Crystal symmetry and the reversibility of martensitic transformations
Martensitic transformations are diffusionless, solid-to-solid phase transitions, and have been observed in metals, alloys, ceramics and proteins. They are characterized by a rapid change of crystal
One-step model of the face-centred-cubic to body-centred-cubic martensitic transformation
A `one-step' theory based on Pitsch distortion is proposed to explain the continuity between the orientations of the Kurdjumov–Sachs (KS), Nishiyama–Wassermann (NW) and Pitsch variants observed on
A model for the FCC→HCP transformation, its applications, and experimental evidence
AbstractA model for the FCC→HCP transformation is proposed. It is envisaged that the dislocation reaction $${\overline 1 }$$ may govern the nucleation of six-layer HCP crystal. A macroscopic HCP
A new nanoscale metastable iron phase in carbon steels
TLDR
An intensive TEM investigation revealed that extra diffraction spots observed by transmission electron microscopy are in fact attributed to the metastable ω phase in particle-like morphology with an overall size of several or dozens of nanometres.
...
1
2
3
4
5
...