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Special Issue "Crystallography of Structural Phase Transformations"
Deadline for manuscript submissions: 15 September 2020.
Solid-solid phase transformations generally imply a crystallographic orientation relationship (OR). The precipitates at the nucleation stage are often in OR with the surrounding matrix; the martensite products are in OR with their parent austenite; and the annealing twins and deformation twins are two crystals of the same species linked by an OR. The symmetries of the phases combined with the OR generate complex microstructures made of variants or twins that can be described mathematically with group theory, linear algebra, coset and multiple cosets, graphs, groupoids, or high-dimension spaces, etc. A lot of efforts have been devoted over the last century to establishing bridges between this “descriptive” crystallography and the “predictive” thermodynamics, but full unification remains to be achieved. For the moment, the models are not well balanced. On the crystallographic side, the phenomenological of theory of martensitic crystallography (PTMC), the edge-to-edge matching model, the disconnection “topological” model, etc. are well developed, but they are often limited to using the generalized Clausius–Clapeyron formula to make the link with thermodynamics. On the thermodynamic side, one can find the famous Landau and Ginzburg–Landau theories, but crystallographic complexity is often reduced to the symmetries of the polynomial form of the free energy introduced with group representation theory. It is not easy to find a way to marry all the different approaches, even if phase field has made a lot of progress over the last decades.
As it is important for research in this field to continue, all experimental and theoretical contributions about phase transformations and crystallography are welcome in this Special Issue, regardless of the type of materials (piezo and ferroelectrics, structurally hardened alloys, martensitic alloys, ordered alloys, shape memory alloys, polymorphic minerals, mechanically twinned materials, etc).
Dr. Cyril Cayron
Manuscript Submission Information
Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.
Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Crystals is an international peer-reviewed open access monthly journal published by MDPI.
Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.
- Phase transformation
- Orientation relationship
The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.
Title: Revisit the role of steps/disconnections on misfit cancellation at semi-coherent interface
—bridging the O-line model and the topological model
Author: Dong Qiu(RMIT University, Melbourne, VIC 3001, Australia)
Abstrsct: It has been a long-standing topic how the lattice misfit is cancelled at semi-coherent interphase boundary consisting of terraces and steps. Apart from a set of misfit dislocations separating the coherent patches, the role of steps (which is frequently called ‘disconnections’) on misfit cancellation remains some ambiguity because these steps do not destroy the continuity of lattice planes across the interface. This paper aims to clarify such ambiguity through identification of a set of secondary dislocations through a rigorous coincidence site lattice (CSL)/ complete pattern shift lattice (DSCL) analysis. A semi-coherent interface between body-centred cubic (BCC) Cr-rich precipitate and face-centred cubic (FCC) Cu-rich matrix that holds a near N-W orientation relationship (OR) is used as an example to demonstrate the procedure to determine the secondary dislocations that are coincident with steps along the interface. The current approach does not only redefine the disconnections in the topological model, but also extends the description of interfacial structure from the O-line model. As a result, the ‘discrepancy’ between these two popular crystallographic models can be completely eliminated when the interface is required to contain a pair of parallel close-packed directions.
Keywords: crystallography; interface; misfit dislocations; phase transformations