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Andreas Mortensen

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Related publications (137)

Page 4 of 7

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

Fracture of convoluted and lamellar α2 + γ TiAl alloys

Andreas Mortensen, 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

Uniaxial deformation of microcellular metals: model systems and simplified analysis

Andreas Mortensen, Frédéric Diologent, Jean-François Despois, Yves Conde, Randoald Müller, 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

Coupling silicon lithography with metal casting

Edoardo Charbon, Andreas Mortensen, Simone Frasca, Luciano Borasi

Micron-scale shaped 2D or 2.5D structures made of silver or copper can be produced by combining silicon photolithographic etching with metal casting by pressure infiltration. This combination of two classical pro-cesses, one from semiconductor fabrication ...

2022

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

Andreas Mortensen, Vincent Laporte

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

Scaling of conductivity and Young’s modulus in replicated microcellular materials

Andreas Mortensen, Andreas Rossoll, Yves Conde

Scaling exponents for the conductivity and stiffness of replicated microcellular materials exceed commonly predicted values of 1 and 2. We show here that this is caused by the fact that, in replicated microcellular materials, the solid architecture varies ...

Springer US2013

Coordination measurements in compacted NaCl irregular powders using X-ray microtomography

Andreas Mortensen

X-ray microtomography and three-dimensional (3D) image analysis are used to quantify the structural evolution during cold isostatic compaction of two irregularly shaped NaCl powders having different mean particle sizes (75 and 400 mu m) and somewhat differ ...

2008

On the bulk compressibility of close-packed particles and their composites

Andreas Mortensen

The hydrostatic compaction of composites comprising a closely-packed particle-bed filled by a dense matrix is measured experimentally using a fluid-pressurization apparatus. A highly compliant polymer or pure aluminium are infiltrated into preforms of pack ...

ELSEVIER SCI LTD2022

On measuring wettability in infiltration processing

Andreas Mortensen, Véronique Michaud

Capillary pressures encountered in composite processing are often evaluated by measuring infiltration rates as a function of applied pressure. Such data are generally interpreted assuming slug-flow. Using the Brooks-Corey correlations we relax this assumpt ...

2007

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

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

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

Cast aluminium single crystals cross the threshold from bulk to size-dependent stochastic plasticity

Andreas Mortensen, William Curtin, Jérôme Krebs, Csilla Mikó, Suzanne Godelieve Alphonsine Verheyden, Satish I Rao

Metals are known to exhibit mechanical behaviour at the nanoscale different to bulk samples. This transition typically initiates at the micrometre scale, yet existing techniques to produce micrometre-sized samples often introduce artefacts that can influen ...

Nature Publishing Group2017

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

Andreas Mortensen, 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

Tensile flow stress of ceramic particle-reinforced metal in the presence of particle cracking

Andreas Mortensen, Ludger Weber, Andreas Rossoll, Randoald Müller

A simplified model is proposed to quantity the effect of damage in the form of particle cracking on the elastic and plastic behaviour of particle-reinforced metal matrix composites under uniaxial tensile loading: cracked particles are simply replaced, in a ...

2008

Effect of hydrostatic pressure on flow and deformation in highly reinforced particulate composites

Andreas Mortensen, Ludger Weber

Infiltrated particle reinforced composites combine a dense matrix with particles that are in mutual contact and can therefore transfer compressive stress directly from one particle to the next. As a result, these composites may combine characteristics of t ...

Elsevier2016

Particle fracture in high volume fraction ceramic reinforced metals: governing parameters and implications for composite failure

Andreas Mortensen, Andreas Rossoll

2009

The effect of size, orientation and temperature on the deformation of microcast silver crystals

Edoardo Charbon, Andreas Mortensen, Simone Frasca, Luciano Borasi

Monocrystalline microwires of silver are produced by means of a novel casting process that combines precise mold production by silicon microfabrication with molten metal pressure infiltration. The wires have a shape amenable to tensile testing and a diamet ...

PERGAMON-ELSEVIER SCIENCE LTD2023

Spherical pore replicated Microcellular Aluminium

Andreas Mortensen

A method is presented that extends the replication process for the manufacture of open-celled metallic foams to include foams with spherical cells. Such foams are produced to a wide range of relative densities, tested for mechanical behaviour and resistanc ...

Japan Institute of Metals, Sendai, Japan2007

Laminated Metal Composites by Infiltration

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

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

20 Hz X-ray tomography during an in situ tensile test

Andreas Mortensen

This paper describes an in-situ tensile test in synchrotron tomography achieved for the first time with a frequency of 20 tomograms per second (20 Hz acquisition frequency). This allows us to capture rapid material fracture processes, such as that of a met ...

Springer2016

The plasticity size effect in replicated microcellular aluminium

Andreas Mortensen, Jean-François Despois

Microcellular aluminium can be produced by replication in porous material with pores across a wide range of sizes but with otherwise identical structures. Compressive tests reveal a plasticity size effect, with samples showing higher strengths and higher r ...

Elsevier2013