Publications de Frédéric Diologent

Influence of quench rate and microstructure on bendability of AA6016 aluminum alloys

Cyrille Bezençon, Jean-François Despois, Andreas Mortensen, Andreas Rossoll, Frédéric Diologent

The influence of the quench rate after solution treatment on the bendability of AA6016 aluminum alloy sheets was investigated. Crack initiation during bending tests is found to be independent of quench rate whereas crack propagation is decreased after rapi ...

Elsevier2013

Fracture of convoluted and lamellar α2 + γ TiAl alloys

Andreas Mortensen, Nicolas Vincent Barbi, Frédéric Diologent

Fracture toughness tests are conducted at room temperature and 923 K (650 degrees C) on SENB (Single Edge Notched Bend) specimens of three different (alpha(2) + gamma ) TiAl-based alloys. One alloy is a conventional near fully lamellar Ti-45Al-2Mn-2Nb + 0. ...

Elsevier2012

Activation volume in microcellular aluminium: Size effects in thermally activated plastic flow

Andreas Mortensen, Frédéric Diologent

Open-pore 99.99% pure Al and Al-5 wt.% Mg foam produced by replication, with pores either 400 or 75 gm in average diameter, are tested in compression with repeated relaxation cycles, at room temperature. Similar data are collected on pure aluminium. Estima ...

Elsevier2011

Creep of replicated microcellular aluminium

Andreas Mortensen, Frédéric Diologent, Sébastien Philippe Soubielle

Open-pore replicated microcellular 99.99% pure aluminium is tested in tensile creep, varying the temperature from 150 to 450 degrees C, the applied stress from 0.15 to 0.5 MPa, and the relative density from 0.14 to 0.28. Tensile creep curves are of classic ...

Elsevier2011

Solid state transformations of Au-Cu-Pt alloys studied by in-situ X-ray synchrotron radiation and DSC

Andreas Mortensen, Edwina Klay, Frédéric Diologent

Seven alloys of the ternary Au-Cu-Pt system, containing 75 or 76.5 wt.% Au with 0-15 wt.% Pt and heat-treated to a fully ordered condition, are examined using in-situ synchrotron radiation to determine transformation temperatures and phases formed, and to ...

Elsevier2011

Fatigue and cyclic creep of replicated microcellular aluminium

Andreas Mortensen, Frédéric Diologent, Sébastien Philippe Soubielle

The cyclic behaviour of 400 mu m pore size replicated aluminium foam is assessed in tension-tension fatigue with a stress ratio equal to 0.1, keeping the load amplitude constant, for relative density values comprised between 0.175 and 0.220. The number of ...

Elsevier2011

L10 nanotwinned gold-rich Au–Cu–Pt

Andreas Mortensen, Edwina Klay, Frédéric Diologent

Ternary Au-Cu-Pt alloys, of unequal gold and copper atomic contents and containing 2.5 wt.% Pt, are ordered isothermally at 250 or 400 degrees C after annealing at 650 degrees C and quenching in water. The alloys are characterized by transmission electron ...

Elsevier2011

Influence of chemistry and microstructure on the activation volume of TiAl alloys

Andreas Mortensen, Nicolas Vincent Barbi, Luc Rougier, Frédéric Diologent

Repeated stress-relaxation experiments are conducted from RT to 1073 K on three different gamma + alpha(2) TiAl alloys (Ti-46Al with 8Ta, 8Nb or 7Nb) One is a conventional duplex alloy, the two other are novel "convoluted" cast titanium aluminides develope ...

Elsevier2010

Surface oxide in replicated microcellular aluminium and its influence on the plasticity size effect

Andreas Mortensen, Frédéric Diologent

The oxide film present along the interface between metal and pores in microcellular aluminium produced by replication depends on the leaching medium that is used to dissolve the NaCl preform: leaching in water produces a thick and irregular multilayered hy ...

2009

Processing of Ag-Cu alloy foam by the replication process

Andreas Mortensen, Ludger Weber, Etienne Combaz, Vincent Laporte, Frédéric Diologent, Fabien Duc

Particulate reinforced material ...

2009

Creep of aluminium-magnesium open cell foam

Andreas Mortensen, Frédéric Diologent

Aluminium-5 wt.% magnesium open cell foam produced by replication and tested in tension at 300, 350 or 450 degrees C creeps at rates between 10(-3) and 10(-8) s(-1). The behaviour of the foam matches that of the alloy from which it is made: three-power law ...

2009

Uniaxial deformation of microcellular metals: model systems and simplified analysis

Jean-François Despois, Randoald Müller, Andreas Mortensen, Yves Conde, Etienne Combaz, Frédéric Diologent, Sébastien Philippe Soubielle

Microcellular aluminium can be produced by a process known as replication; this involves the infiltration of a packed bed of NaCl particles which are subsequently leached after metal solidification. The resulting material features a uniform distribution of ...

Springer2009

Microstructure, Strength and Creep of Aluminium-nickel Open Cell Foam

Andreas Mortensen, Yves Conde, Frédéric Diologent

Al-6.4 wt% Ni open-cell foams produced by replication are tested in compression and in tension at room temperature and creep tested in tension at 450C. The mechanical behaviour of this foam at room temperature is consistent with that observed for other ope ...

2009

Fracture toughness of TiAl alloys: A comparison of two gamma-a2 structures

Andreas Mortensen, Nicolas Vincent Barbi, Frédéric Diologent

Toughness measurements of a Ti-45Al-2N4u-2Nb + 0.8%vol TiB2 alloy with a. near fully lamellar microstructure and a Ti-46Al-8Nb alloy with a convoluted microstructure are performed at 650 degrees C under vacuum according to ASTM Standard E1820. Respective v ...

MINERALS, METALS & MATERIALS SOC2008

Measurement of the effective activation volume in 45 XD titanium aluminides by repeated transient tests

Frédéric Diologent

2008

Influence of the gamma' phase fraction on the gamma/gamma' Topological inversion During high temperature Creep of Single Crystal Superalloys

Frédéric Diologent

TMS2008

On the steady-state creep of microcellular metals

Randoald Müller, Andreas Mortensen, Frédéric Diologent, Sébastien Philippe Soubielle

2007

Corrélation entre la forme d'inclusions intergranulaires et l'énergie de joints de grains dans un alliage Cu-1Pb

Andreas Mortensen, Vincent Laporte, Frédéric Diologent

2006

Relationship between morphological Evolution of the gamma/gamma' Microstructure and Creep Behaviour of Ni-based Single Crystal Superalloys

Frédéric Diologent

2006

Temperature dependence of lattice mismatch and gamma' volume fraction of a fourth-generation monocrystalline nickel-based superalloy

Frédéric Diologent

The strain distribution in a new generation nickel-based single crystal superalloy has been determined in the temperature range 293K–1598K. Measurements have been performed using diffraction of high energy synchrotron radiation (150keV, λ = 0.008 nm) to de ...

2006