Cayron

RESEARCH, TEACHING, or OTHER INTERESTS

Materials Science, Metals and Alloys

Scopus Publications

Hard-sphere model of the B2 → B19’ phase transformation, and its application to predict the B19’ structure in NiTi alloys and the B19 structures in other binary alloys
Cyril Cayron
Elsevier BV



Monitoring of laser-induced fast recrystallization in SS-316L through synchrotron X-ray diffraction
Claire Navarre, Steven Van Petegem, Lucas Schlenger, Cyril Cayron, Milad Hamidi-Nasab, Reza Esmaeilzadeh, Charlotte de Formanoir, Nicola Casati, and Roland E. Logé
Elsevier BV



EBSD study of variant reorientation, texture, and twin formation in a martensitic NiTi alloy deformed in compression
J.F. Xiao, C. Cayron, M. Van der Meer, and R.E. Logé
Elsevier BV



In-situ selective laser heat treatment for microstructural control of additively manufactured Ti-6Al-4V
Reza Esmaeilzadeh, Milad Hamidi-Nasab, Charlotte de Formanoir, Lucas Schlenger, Steven Van Petegem, Claire Navarre, Cyril Cayron, Nicola Casati, Daniel Grolimund, and Roland E. Logé
Elsevier BV



Revealing the microstructure evolution of the deformed superelastic NiTi wire by EBSD
J.F. Xiao, C. Cayron, and R.E. Logé
Elsevier BV



Laser powder-bed fusion of a high entropy alloy with outstanding intrinsic mechanical properties
Navid Sohrabi, Ruoshi Ran, Pau Ayuso Duro, Cyril Cayron, Jamasp Jhabvala, Vaclav Pejchal, Olha Sereda, and Roland E. Logé
Elsevier BV



Simple shear extrusion versus equal channel angular pressing: A comparative study on the microstructure and mechanical properties of an Mg alloy
A. Rezaei, R. Mahmudi, C. Cayron, and R.E. Logé
Elsevier BV



Response of magnesium microcrystals to c-axis compression and contraction loadings at low and high strain rates
Nicolò Maria della Ventura, Amit Sharma, Cyril Cayron, Szilvia Kalácska, Thomas E.J. Edwards, Cinzia Peruzzi, Manish Jain, Julia T. Pürstl, Roland E. Logé, Johann Michler,et al.
Elsevier BV



Reply to “Comment: On the nature of ‘unconventional twins’ in magnesium”
Cyril Cayron
Elsevier BV



An investigation on reorientation and textural evolution in a martensitic NiTi rolled sheet using EBSD
J.F. Xiao, C. Cayron, and R.E. Logé
Elsevier BV



The concept of axial weak twins
Cyril Cayron
Elsevier BV



Effect of chromium content on microstructural evolution of CoNiAlW superalloy
Aliakbar Fallah Sheykhlari, Hossein Arabi, Seyed Mohammad Ali Boutorabi, and Cyril Cayron
Springer Science and Business Media LLC



Thermally controlled growth of photoactive FAPbI<inf>3</inf> films for highly stable perovskite solar cells
Sandy Sánchez, Stefania Cacovich, Guillaume Vidon, Jean-François Guillemoles, Felix Eickemeyer, Shaik M. Zakeeruddin, Jürgen E. K. Schawe, Jörg F. Löffler, Cyril Cayron, Pascal Schouwink,et al.
Royal Society of Chemistry (RSC)
In this work, we elucidate the relationship between heating-rate and FAPbI3 perovskite phase transformation, bringing a new relationship with crystal growth parameters. Thus, we manufactured highly stable perovskite solar cells with a 640 ms IR pulse.


Evolution of deformation twinning mechanisms in magnesium from low to high strain rates
Nicolò M. della Ventura, Amit Sharma, Szilvia Kalácska, Manish Jain, Thomas E.J. Edwards, Cyril Cayron, Roland Logé, Johann Michler, and Xavier Maeder
Elsevier BV



Hot rocks: Constraining the thermal conditions of the Mistastin Lake impact melt deposits using zircon grain microstructures
G.D. Tolometti, T.M. Erickson, G.R. Osinski, C. Cayron, and C.D. Neish
Elsevier BV



Persistence of variant selection in red gold alloys
Margaux N.D. Larcher, Cyril Cayron, Andreas Blatter, Raphaëlle Soulignac, and Roland E. Logé
Elsevier BV



Understanding variant selection and texture in additively manufactured red-gold alloys
Hossein Ghasemi-Tabasi, Margaux N.D. Larcher, Cyril Cayron, Jamasp Jhabvala, Steven Van Petegem, Nikola Kalentics, Eric Boillat, and Roland E. Logé
Elsevier BV



The Correspondence Theory and Its Application to NiTi Shape Memory Alloys
Cyril Cayron
MDPI AG
Martensite crystallography is usually described by the phenomenological theory of martensite crystallography (PTMC). This theory relies on stretch matrices and compatibility equations, but it does not give a global view on the structures of variants, and it masks the relative roles of the symmetries and metrics. Here, we propose an alternative theory called correspondence theory (CT) based on correspondences and symmetries. The compatibility twins between the martensite variants are inherited by correspondence from the symmetry elements of austenite. We show that, for the B2 to B19′ transformation, there is a one-to-one relation between the specific misorientations and the specific inter-correspondences between the variants. For each type of misorientation, the twin of its junction plane can be predicted without calculating the stretch matrices, as in PTMC. The rational elements of the twins do not depend on the metrics; all the transformation twins are thus “generic”. We also introduce the concept of a weak plane that permits to explain the junction planes for polar pairs of variants for which the PTMC compatibility equations cannot be solved. The predictions are validated by comparison with experimental Transmission Kikuchi Diffraction (TKD) maps.


A new method for lattice reduction using directional and hyperplanar shearing
Cyril Cayron
International Union of Crystallography (IUCr)
A geometric method of lattice reduction based on cycles of directional and hyperplanar shears is presented. The deviation from cubicity at each step of the reduction is evaluated by a parameter called `basis rhombicity' which is the sum of the absolute values of the elements of the metric tensor associated with the basis. The levels of reduction are quite similar to those obtained with the Lenstra–Lenstra–Lovász (LLL) algorithm, at least up to the moderate dimensions that have been tested (lower than 20). The method can be used to reduce unit cells attached to given hyperplanes.


Micro-addition of Fe in highly alloyed Cu-Ti alloys to improve both formability and strength
B. Rouxel, Cyril Cayron, Julien Bornand, Paul Sanders, and Roland E. Logé
Elsevier BV



Reply to “Response to “Diffraction artefacts from twins and stacking faults, and the mirage of hexagonal, polytypes or other superstructures"”
Cyril Cayron
Elsevier BV



Diffraction artefacts from twins and stacking faults, and the mirage of hexagonal, polytypes or other superstructures
Cyril Cayron
Elsevier BV



Microstructural evolution and superplastic behavior of a fine-grained Mg−Gd−Y−Ag alloy processed by simple shear extrusion
A. Rezaei, R. Mahmudi, C. Cayron, and R. Loge
Elsevier BV



Superplastic behavior of a severely deformed Mg–6Gd−3Y−0.5Ag alloy
A. Rezaei, R. Mahmudi, C. Cayron, and R.E. Loge
Elsevier BV



A fast algorithm to find reduced hyperplane unit cells and solve N-dimensional Bézout’s identities
Cyril Cayron
International Union of Crystallography (IUCr)
Deformation twinning on a plane is a simple shear that transforms a unit cell attached to the plane into another unit cell equivalent by mirror symmetry or 180° rotation. Thus, crystallographic models of twinning require the determination of the short unit cells attached to the planes, or hyperplanes for dimensions higher than 3. Here, a method is presented to find them. Equivalently, it gives the solutions of the N-dimensional Bézout's identity associated with the Miller indices of the hyperplane.