Publication
Persistence of variant selection in red gold alloys
Related publications (32)
Phase transformation induced distortions in red gold alloys
Margaux Nathalie Dominique Larcher
Red gold alloys owe their warm and attractive colour to the combination of gold and copper atoms. Thanks to their good mechanical properties and resistance to corrosion, red gold alloys are used in luxury industries as well as in dentistry. Around the equi ...
EPFL2021Understanding Thermomechanical Treatments Induced by Laser Powder Bed Fusion Process
Additive Manufacturing (AM) is referred to technologies that produce directly 3D parts in a layer-by-layer fashion. Laser Powder Bed Fusion (L-PBF) is one of the most important AM processes, enabling production of very complex metallic objects from a compu ...
EPFL2021The effect of stress triaxiality on the phase transformation in transformation induced plasticity steels: Experimental investigation and modelling the transformation kinetics
Helena Van Swygenhoven, Efthymios Polatidis, Nicola Casati
In situ multiaxial loading during neutron diffraction tests were undertaken on a low-alloyed Quenched and Partitioning (Q&P) Transformation Induced Plasticity (TRIP) Bainitic Ferrite (TBF) steel with dispersed austenite particles. The effect of stress tria ...
2021Mapping Spatial Distribution of Pores in an Additively Manufactured Gold Alloy Using Neutron Microtomography
Roland Logé, Jamasp Jhabvala, Markus Strobl, Hossein Ghasemi Tabasi, Michaël Meyer
A crucial criterion for the quality of the additively manufactured parts is the porosity content for achieving an acceptable final relative density. In addition, for jewelry applications, visible pores are unacceptable at or in the vicinity of the surface. ...
2021The thermally activated distortion with amplification effect and related variant selection in red gold alloys
Roland Logé, Cyril Cayron, Margaux Nathalie Dominique Larcher
Variant selection during the A1→L10 transformation in a polycrystalline red gold alloy close to equiatomic Au-Cu composition has been extensively studied by Electron Backscatter Diffraction (EBSD) in our previous work. The use of a mathematical description ...
2020Influence of thermo-mechanical processing on ordering kinetics in 18 karat red gold alloy
The aim of this project is to understand the correlation between alloy composition and the build-up of internal stresses in 18 carat Au-Ag-Cu alloys under thermo-mechanical loads. The copper rich end of this ternary system exhibits order-hardening of the e ...
EPFL2020Electron backscatter diffraction study of variant selection during ordering phase transformation in L1(0)-type red gold alloy
Roland Logé, Cyril Cayron, Margaux Nathalie Dominique Larcher
A shape-memory effect is known to appear in red gold alloys with compositions close to Au-Cu. The aim of this paper is to study by electron backscatter diffraction (EBSD) the variant selection in the A1 -> L1(0) transformation occurring under stress, in be ...
INT UNION CRYSTALLOGRAPHY2019Predicting the reflectivity and colour of metals from first principles
Gold and copper are the only two elemental metals that show a characteristic colour, due to the presence of a drop in the reflectivity curve inside the visible range. Reflectivities of all other metals are in general high and flat for all visible frequenci ...
EPFL2019Variant selection in martensitic steels
The martensitic phase transformation in steel is one of the most famous solid state transformation because of its contribution in the development of the modern industry. This transformation from a face-centered cubic (FCC) high temperature phase, called th ...
EPFL2019Variant Selection in Fe-20Ni-1.8C under Bending
Roland Logé, Cyril Cayron, Annick Pauline Baur
Variant selection is commonly observed in martensitic steels when a stress is applied to the material during transformation. Classically, the selection phenomenon is modelled considering the work of the shape strain in the applied stress field. This shape ...
2018