Special Issue "Deformation and Transformation Twinning"
Deadline for manuscript submissions: closed (31 October 2020) | Viewed by 11124
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 Crystals: Crystallography of Structural Phase Transformations (Volume II)
Topical Collection in Crystals: Review Papers in Microstructures of Alloys
Deformation twinning is a stress-induced lattice distortion (with or without atomic shuffles) that transforms a crystal into another crystal of same phase but with a different orientation. Deformation twinning is known from the early birth of mineralogy, and crystallographic models have been improved over the past century, from the shear modes I and II established by Mügge in 1889, to the algorithmic method proposed by Bevis and Crocker in 1968 based on the correspondence and metric tensors. For the last few decades, thanks to the progress of characterization techniques such as Electron BackScatter Diffraction (EBSD) and Digital Image Correlation (DIC), new twinning systems have been discovered or rediscovered, such as the “double twins” in magnesium alloys, and the (332) twins in some titanium alloys. Some twins are associated with abnormally low Schmid factors, or are of pure stretch type (“zero-shear”), which challenges the classical theories.
The nature of transformation twinning is different. Transformation twins are actually variants generated by a phase transformation, and the twin law results from the broken parent symmetries. This indirect relation between the twins may be confusing, and one may think that a variant can be transformed into another variant via the usual (shear) deformation twinning mechanism. This assumption is the cornerstone of the phenomenological theory of martensitic crystallography (PTMC) to explain the shape memory effect. However, there is no direct evidence that shows that such a simple shear mechanism is the correct one. A lot of important questions remain open.
All contributions are welcome in this Special Issue, including critical and constructive reviews, new surprising experimental results, even if not yet fully understood and interpreted, and new theoretical models based on classical crystallography, disconnections, phase field simulations, etc.
Dr. Cyril Cayron
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- Deformation twins
- Transformation twins
- Shape memory alloys
- Lattice distortion