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Martin Guillermo Mueller

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Publications associées (24)

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Hexagonal OsB2: Sintering, microstructure and mechanical properties

Martin Guillermo Mueller, Nina Orlovskaya

The metastable high pressure ReB2-type hexagonal OsB2 bulk ceramics was produced by spark plasma sintering. The phase composition, microstructure, and mechanical behavior of the sintered OsB2 were studied by X-ray diffraction, optical microscopy, TEM, SEM, ...

Elsevier2015

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We show that chevron-notched samples offer an attractive approach to the measurement of fracture toughness in micron-scale samples of brittle materials and use the method to characterize quartz and nanocrystalline alumina. Focused ion beam milling is used ...

Elsevier2015

Probing the local strength and toughness of microscopic hard second phases in alloys and composites

Andreas Mortensen, Marco Cantoni, Goran Zagar, Raphaël Charvet, Cyril Dénéréaz, Martin Guillermo Mueller, Václav Pejchal, Marta Fornabaio, Lionel Michelet, Willy Dufour

Many engineering alloys and composites combine a ductile matrix with discrete microscopic reinforcing phases. It is known that the mechanical properties of such alloys and composites are strongly influenced by those of those reinforcing phases; however, su ...

2015

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Mechanical properties of composite materials and alloys are strongly influenced by the intrinsic mechanical properties of the reinforcing phases they contain; however, due to the irregular shape and small size of particulate reinforcements, measuring their ...

2015

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It is known that the mechanical properties of composite materials and alloys are influenced by the intrinsic mechanical properties of their reinforcements or second phases. It is however challenging to determine such local properties, given their small siz ...

2015

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The influence of slow crack growth in ceramics on the measurement of their fracture toughness under steadily increasing controlled load (as is generally practiced in microscale testing) is analyzed to identify conditions under which the phenomenon can caus ...

Elsevier2015

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We measure, using an adaptation of a method designed for ceramic ball bearings, the local strength of a brittle second phase that serves to reinforce a metal. The method uses focused ion beam milling and a nanoindentation device, and is free of artifacts c ...

Elsevier2015

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It is well understood that the intrinsic mechanical properties of reinforcements and second phases strongly influence those of composite materials and alloys; however, these properties are challenging to determine due to the small size and irregular shape ...

2014

Measuring the local strength of alumina reinforcements

Andreas Mortensen, Marco Cantoni, Goran Zagar, Andreas Rossoll, Martin Guillermo Mueller, Václav Pejchal

Ceramic particles in metal matrix composites, or hard second phases in alloys, often serve as reinforcements, raising its stiffness, hardness and strength. Their efficiency depends on their strength, a quantity that is statistically distributed over micros ...

2014

Testing strength and fracture toughness of hard second phases at micron scale

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

Local mechanical properties LMP 2015, November 12-14, 2014, Stará Lesná, Slovakia. Many alloys and composites combine a ductile matrix with discrete reinforcing phases, such as the ceramic fibers or particles that are used in metal matrix composites. It is ...

2014