Publications de Lionel Michelet

Processing and micro-mechanical characterization of multi-component transition MC carbides in iron

Andreas Mortensen, Goran Zagar, Léa Deillon, Marta Fornabaio, Lionel Michelet

We prepare multi-component transition monocarbides of chosen composition by arc-melting together a pre-alloy of the transition metals and cast iron. Based on the elements Ti, Ta, V, Nb and W, 51 different binary, ternary and quaternary compositions are pro ...

2021

Mechanical properties of MC multimetallic carbides in steel

Lionel Michelet

Carbides constitute a class of materials used for many applications, where excellent mechanical properties, such as stiffness, hardness and fracture toughness, are required. The machining industry is a typical example where carbide are crucial materials. W ...

EPFL2018

Fracture toughness measurement in fused quartz using triangular chevron-notched micro-cantilevers

Andreas Mortensen, Goran Zagar, Lionel Michelet, Martin Guillermo Mueller, Václav Pejchal

We extend to flat surfaces the fracture toughness method presented in Acts Materialia vol. 86 (2015) p.385 and measure in this manner the fracture toughness of fused quartz. Tests give 0.67 +/- 0.01 MPa m(1/2) which agrees with earlier microscopic and macr ...

Elsevier2016

Suppression of three dimensional twinning for a 100% yield of vertical GaAs nanowires on silicon

Anna Fontcuberta i Morral, Martin Heiss, Emanuele Uccelli, Eleonora Russo, Lionel Michelet

Multiple seed formation by three-dimensional twinning at the initial stages of growth explains the manifold of orientations found when self-catalyzed GaAs nanowires grow on silicon. This mechanism can be tuned as a function of the growth conditions by chan ...

2012