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Related publications (29)

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Probability of twin boundary formation associated with the nucleation of equiaxed grains on icosahedral quasicrystal templates

Michel Rappaz, Güven Kurtuldu

Recently, we have shown that minute Cr additions (typically 0.1 wt%) to Al-Zn alloys solidified in a uniform temperature field lead to the formation of fine equiaxed fcc Al grains [1]. Furthermore, these grains exhibit an unexpectedly large number of twin, ...

Iop Publishing Ltd2015

Quench-Induced Stresses in AA2618 Forgings for Impellers: A Multiphysics and Multiscale Problem

Jean-Marie Drezet, Nicolas Paul Henry Chobaut

In the fabrication of heat-treatable aluminum parts such as AA2618 compressor impellers for turbochargers, solutionizing and quenching are key steps to obtain the required mechanical characteristics. Fast quenching is necessary to avoid coarse precipitatio ...

Springer2015

Structural anelasticity, elasticity and broken ergodicity in Ni-Ti shape memory alloys

Daniele Mari

New data are presented on dynamic measurements of elasticity and anelasticity of several poly- and single crystalline Ni1+xTi1-x alloys for frequencies between 0.05 and 100 kHz over a wide temperature range below room temperature. Anelastic effects, previo ...

Pergamon-Elsevier Science Ltd2014

Growth kinetics of Al-Fe intermetallic compounds during annealing treatment of friction stir lap welds

Hossein Najafi

In this study, we explored the growth kinetics of the Al-Fe intermetallic (IM) layer at the joint interface of the St-12/Al-5083 friction stir lap welds during post-weld annealing treatment at 350, 400 and 450 degrees C for 30 to 180 mm. Optical microscope ...

Elsevier Science Inc2014

Dendritic Growth Morphologies in Al-Zn Alloys-Part I: X-ray Tomographic Microscopy

Michel Rappaz, Paolo Di Napoli, Jonathan Friedli

Upon solidification, most metallic alloys form dendritic structures that grow along directions corresponding to low index crystal axes, e.g., directions in fcc aluminum. However, recent findings[1,2] have shown that an increase in the zinc content in Al-Zn ...

Springer Verlag2013

High temperature transformations in a steel-TiCN cermet

Daniele Mari

The influence of the carbon content on the microstructure, phase transformation and hardness of an iron-based cermet is studied. The cermet is constituted by a high-alloyed steel as matrix, and TiCN particles (50 vol.%) as reinforcement. The material is pr ...

Elsevier Sci Ltd2013

Dynamics of capillary self-alignment for mesoscopic foil devices

Jürgen Brugger, Massimo Mastrangeli

We report experimental evidence for three sequential, distinct dynamic regimes in the capillary self-alignment of centimeter-sized foil dies released at large uniaxial offsets from equilibrium. We show that the initial transient wetting regime, along with ...

American Institute of Physics2013

Interaction between liquid aluminium and solid iron Al-rich intermetallics formation

Guillaume Pasche

Intermetallic phases formation is one of the phenomena, which when coupled to thermal and mechanical strains leads to the premature wear of aluminium die casting tools made out of steel. This work focuses on two aspects of this wear problem. The first and ...

EPFL2013

Synthesis and Characterization of High-Photoactivity Electrodeposited Cu2O solar absorber by photoelectrochemistry and ultrafast spectroscopy

Michael Graetzel, Jacques-Edouard Moser, Jan Cornelius Brauer, Adriana Paracchino

We present a systematic study on the effects of electrodeposition parameters on the photoelectrochemical properties of Cu2O. The influence of deposition variables (temperature, pH, and deposition current density) on conductivity has been widely explored in ...

2012