Publications de Cyril Cayron | EPFL Graph Search

Microstructure and texture evolution in laser Shock Peened martensitic NiTi shape memory alloy

Roland Logé, Cyril Cayron, Junfeng Xiao, Yandong Jing

The Laser Shock Peening (LSP) is commonly used to strengthen the surface of materials. However, the microstructures after LSP impact are complex due to the intense forces involved. In this study, we explore how martensitic microstructures evolve in a half ...

2025

Formation mechanism and microstructural characteristics of a body-centered cubic phase in 3D printed 316L–CuCrZr multi-material structures, combining laser powder bed fusion with foils

Roland Logé, Cyril Cayron, Jamasp Jhabvala

Additive manufacturing of 316L/CuCrZr multi-material metallic structures has recently attracted significant attention, due to the ideal combination of structural and thermal/electrical properties. In this work, a unique multi-phase microstructure was produ ...

2025

Pinpointing the thermal history of lunar basaltic meteorites in a nutshell

Philippe Gillet, Cyril Cayron, Arthur Brian Aebersold, Rongrong Cai

Native metals of igneous origin are recognized as one of the distinctive features of basalts from the Moon. Our study demonstrates that the tiny Fe-Ni metal blebs nucleated from lunar magma exhibit unanticipated, nutshell-like, crystallographic microstruct ...

Springer Science and Business Media LLC2025

The role of interaction work in martensite deformation

Roland Logé, Cyril Cayron, Junfeng Xiao

This study elucidates the evolution of martensite deformation via Interaction Work (IW). The IW is the mechanical work done by external loading, assisting deformation by competing with the energy barrier. This interplay establishes the maximum IW (IWmax) c ...

2025

Toward Architected Microstructures Using Advanced Laser Beam Shaping in Laser Powder Bed Fusion of Ti-6al-4v

Roland Logé, Cyril Cayron, Jamasp Jhabvala, Eric Boillat, Mathijs Pieter van der Meer, Junfeng Xiao

Laser Powder Bed Fusion (LPBF) stations mostly use lasers with a Gaussian beam intensity distribution, as it has advantages like small divergence and high ability to be focused. This distribution creates significant thermal gradients leading to high coolin ...

WILEY-V C H VERLAG GMBH2025

Microstructures and outstanding mechanical properties of the 18 carat Au–Ti alloy after age-hardening

Roland Logé, Cyril Cayron

Watchmakers and jewellers are looking for novel 18 carat (ct) gold alloys (75 wt% Au) that combine superior hardness (≥ 300 HV) and scratch resistance with the excellent ductility and machinability characteristic of traditional 18 ct Au–Cu–Ag alloys. The A ...

2025

Tailoring mechanical properties and microstructures in laser powder bed fusion of 316 L stainless steel through aluminium alloying and combined ex-situ and in-situ heat treatments

Roland Logé, Cyril Cayron

Laser powder bed fusion (LPBF) is a bottom-up manufacturing technique using a high-energy laser to selectively melt metallic alloys, enabling the creation of complex microstructures. While rapid cooling rates and process stochasticity can lead to unpredict ...

2025

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

The pseudoelastic and pseudoplastic properties of NiTi alloys result from the closeness of the structures between the B2 cubic austenite and the B19' monoclinic martensite, and from the facility to transform one into each other. The paths followed by the a ...

Elsevier BV2024

Monitoring of laser-induced fast recrystallization in SS-316L through synchrotron X-ray diffraction

Roland Logé, Cyril Cayron, Milad Hamidi Nasab

Laser based heat treatments have multiple applications for local tuning of microstructures. They are particularly relevant in the context of laser-based additive manufacturing (LAM), in order to relieve residual stresses or introduce equiaxed structures th ...

Elsevier Sci Ltd2024

Zircon microstructures record high temperature and pressure conditions during impact melt evolution at the West Clearwater Lake impact structure, Canada

Cyril Cayron

Theoretical predictions had suggested that impact melts can experience temperatures far exceeding those in endogenous igneous settings. Direct evidence of the hottest temperatures recorded in impactites was observed recently at the Mistastin Lake impact st ...

2024