Publications by Andreas Mortensen

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Isothermal NaCl sintering experiments are conducted between 500 and 790 degrees C on powders 75, 100, 150 and 400 mu m in average diameter. Along with literature data, the results are compared with theoretical predictions for the initial stage of sintering ...

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 ...

The replication process is presented and discussed with emphasis on methods for microstructural tailoring of open-pore microcellular aluminium-based foams, highlighting methods it offers for control of principal foam mesostructural and microstructural parameters: pore volume fraction, pore shape, pore size(s), as well as the composition and microstructure of the metal making the foam.

Tensile tests have been performed on replicated aluminum alloy foams of relative density between 4.5% and 8%. During the test the electrical resistance was measured with a four-point set-up and the displacements along the gage section were measured using a ...

Internal damage in uniaxial continuous alumina fibre-reinforced aluminium is measured by acoustic emission during tensile straining in the fibre direction. Over most of the loading history spatially uncorrelated fibre fragmentation occurs, consistent with ...

An overview is presented of current research at EPFL on structural metallic materials produced by infiltration processing. The paper comprises a brief introduction to the infiltration process, then presents results on particle reinforced metals and open-celled aluminium foams.

A new technique is proposed for the direct measurement of capillary forces in systems of relevance to the infiltration processing of metal matrix composites. Capable of handling melt temperatures up to 1500 K and infiltration pressures up to 20 MPa, the te ...

Despite remarkable progress made in recent years, producing freeform three-dimensional micro-components out of copper, silver or gold and their alloys remains an engineering challenge: current processes are either too slow to be economically viable, or pro ...

Particulate reinforced material ...

The high-temperature wettability of AlN particle preforms with pure molten Cu, Al and Ph is quantified by means of drainage curves measured during pressure infiltration. By integrating the drainage curves obtained in this study, the work of immersion for e ...

Les normes environnementales régissant la production et l’utilisation d’alliages contenant du plomb réduisent régulièrement les teneurs en plomb autorisées. Dans le cas des laitons utilisés en plomberie, le plomb ajouté afin de faciliter l’usinage du matériau doit être remplacé par un autre élément (non toxique) conduisant également à une excellente usinabilité. Les laitons au bismuth représentent une alternative potentielle. Les propriétés mécaniques des deux laitons suivants sont ainsi comparées à l’aide

We explore the influence of the metal microstructure on the compressive flow stress of replicated microcellular 400-mu m pore size Al-4.5 wt%Cu solidified at two different solidification cooling rates, in the as-cast and T6 conditions. It is found that the ...

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 ...

Microcellular open-cell metal foams with pores of 75 or 400 pm in diameter and made of pure Al or Al-2 wt% Mg are tested in compression. The aluminum foam exhibits a typical smooth plastic flow and a positive strain rate sensitivity, whereas plastic instab ...

Andreas Mortensen

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Sintering of NaCl powder: Mechanisms and first stage kinetics

Fatigue and cyclic creep of replicated microcellular aluminium

Microstructural tailoring of open-pore microcellular aluminium by replication processing

Fracture behavior of low-density replicated aluminum alloy foams

Measurement of damage evolution in continuous ceramic fibre-reinforced metals by acoustic emission

Structural metallic materials by infiltration

A stereoscopic method for dihedral angle measurement

Measuring and tailoring capillary forces during liquid metal infiltration

3D metal freeform micromanufacturing

Processing of Ag-Cu alloy foam by the replication process

Influence of the infiltration pressure on the structure and properties of replicated aluminium foams

High-temperature wettability of aluminum nitride during liquid metal infiltration

Diffusion-limited reactive wetting: effect of interfacial reaction behind the advancing triple line

Les laitons au bismuth : une alternative aux laitons au plomb ?

The effect of preform processing on replicated aluminium foam structure and mechanical properties

Influence of microstructural heterogeneity on the scaling between flow stress and relative density in microcellular Al-4.5 %Cu

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

Materials science: Pleated crystals

Occurrence of the Portevin Le-Chatelier effect in open-cell microcellular Al-2 wt% Mg

Increasing the strength/toughness combination of high volume fraction particulate metal matrixComposites using an Al-Ag matrix alloy