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Andreas Mortensen

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Publications associées (138)

Capillarity in pressure infiltration: improvements in characterization of high-temperature systems

Willy Dufour, Andreas Mortensen, Ludger Weber, Raphaël Charvet, Alain Léger, Claudio Bacciarini, Noelia Rojo Calderon

In the pressure infiltration of metal matrix composites, molten metal is injected under external pressure into a porous preform of the reinforcing material. Equilibrium capillary parameters characterizing wetting for this process are summarized in plots of ...

Springer Verlag2012

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

Porous metal article and method of producing a porous metal article

Andreas Mortensen

A process for producing a metal article containing at least 10% interconnected porosity, using a preform (11), comprising: mixing an organic binder, a wetting agent and a granular material, to obtain a mouldable paste that combines 10 vol. pct. or more of ...

2012

Tensile strength of axially loaded unidirectional Nextel 610 (TM) reinforced aluminium: A case study in local load sharing between randomly distributed fibres

Andreas Mortensen, Benedikt Moser, Andreas Rossoll

The tensile failure of unidirectional alumina fibre reinforced aluminium is studied in uniaxial loading along the fibre axis. The tensile strength is measured as a function of matrix yield strength, which is varied by varying the testing temperature, from ...

2012

Al2O3 particle rounding in molten copper and Cu8wt%Al

Andreas Mortensen

We investigate processing-microstructure relationships in the production of Al2O3 particle reinforced copper composites by solidification processing. We show that during production of the composites by gas-pressure infiltration of packed Al2O3 particle pre ...

Springer US2012

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

Hole and notch sensitivity of aluminium replicated foam

Andreas Mortensen, Andreas Rossoll, Etienne Combaz

The flow and failure behaviour of replicated pure aluminium foams in the presence of holes and notches is explored, varying the pore size and the notch depth or hole radius. Flat dog-bone tensile specimens containing a cylindrical hole, and cylindrical V-n ...

Elsevier2011

Multiaxial yield behaviour of Al replicated foam

Willy Dufour, Andreas Mortensen, Etienne Combaz, Raphaël Charvet, Claudio Bacciarini

Multiaxial experiments are performed on replicated aluminium foam using a custom-built apparatus. The foam structure is isotropic, and features open monomodal pores 75 mu m in average diameter. Plane stress (sigma(1), sigma(2), sigma(3) = 0) and axisymmetr ...

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

Laminated Metal Composites by Infiltration

Andreas Mortensen, Andreas Rossoll, Jérôme Krebs, Alexandre Durussel, Arda Cetin

We show that steel-magnesium alloy laminated metal composites (LMCs) can be produced by gas pressure infiltration of a liquid magnesium alloy between layers of stacked dimpled steel sheets. Resulting LMCs are amenable to subsequent warm rolling. The LMCs a ...

Springer US2011

Thermal conductivity and interfacial conductance of AlN particle reinforced metal matrix composites

Andreas Mortensen, Ludger Weber, Christian Monachon, Masahiro Kida

Aluminum nitride (AlN) particle reinforced metal-matrix-composites produced by pressure infiltration are characterized in terms of their thermal conductivity. The composites are designed to cover a wide range of phase contrast between the dispersed particl ...

American Institute of Physics2011

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

On measured activation volumes as relevant to ratcheting or cyclic creep

Andreas Mortensen, Sébastien Philippe Soubielle

We consider a material having a constant true activation volume and estimate the apparent activation volume that it displays in cyclic creep or ratcheting. We show that cyclic stresses have an effect on the measured value, and that this can be accounted fo ...

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

Preform to produce metallic foam

Andreas Mortensen

2010

Fracture of high volume fraction ceramic particle reinforced aluminium under multiaxial stress

Andreas Mortensen, Aude Hauert, Andreas Rossoll

Circumferentially notched cylindrical bars of high volume fraction Al2O3 particle reinforced aluminium are tested in tension to probe the role of tensile stress triaxiality on damage and failure of such materials. The transverse strain is monitored with a ...

Elsevier2010

Solidification of Al-4.5 wt pct Cu-Replicated Foams

Andreas Mortensen, Yves Conde

Microcellular Al-4.5 wt pct Cu of 400- or 75-mu m average pore diameter is solidified at cooling rates ranging from -30 K/min to -0.45 K/min (-30 A degrees C/min to -0.45 A degrees C/min). In the 400-mu m pore size samples, the dendritic character is lost, ...

2010

Measurement and anisotropy of grain boundary energy in Cu-1 wt.% PB

Andreas Mortensen, Vincent Laporte, Doris Empl

A method is presented for the simultaneous measurement of relative grain boundary energy and all five macroscopic grain boundary degrees of freedom in leaded copper. When compared to the Wynblatt–Takashima model, results suggest a lowered boundary energy w ...

2010

Metal Matrix Composites

Andreas Mortensen

In metal matrix composites, a metal is combined with another, often nonmetallic, phase to produce a novel material having attractive engineering attributes of its own. A subject of much research in the 1980s and 1990s, this class of materials has, in the p ...

2010

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