Special Issue "Crystallography of Structural Phase Transformations (Volume II)"
Deadline for manuscript submissions: closed (16 September 2022) | Viewed by 6398
Interests: metallurgy; EBSD; TEM; crystallography; martensitic transformations; twinning; variants; group theory
Special Issues, Collections and Topics in MDPI journals
Special Issue in Crystals: Crystallography of Structural Phase Transformations
Special Issue in Metals: Deformation and Transformation Twinning
Topical Collection in Crystals: Review Papers in Microstructures of Alloys
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, martensite products are in OR with their parent austenite, and 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, high-dimension spaces, etc. Many 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 great progress over the last several 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 material (piezo- and ferroelectrics, structurally hardened alloys, martensitic alloys, ordered alloys, shape-memory alloys, polymorphic minerals, mechanically twinned materials, etc.).
Dr. Cyril Cayron
Dr. Junfeng Xiao
Manuscript Submission Information
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- phase transformation
- orientation relationship