Title

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF METAL MATRIX COMPOSITES PROCESSED BY SEVERE PLASTIC DEFORMATION

MICROSTRUCTURE AND MECHANICAL PROPERTIES OF METAL MATRIX COMPOSITES PROCESSED BY SEVERE PLASTIC DEFORMATION

Authorship

BACHMAIER, ANDREA; PIPPAN, REINHARD

BACHMAIER, ANDREA

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PIPPAN, REINHARD

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DOI

10.5151/2594-5327-35023

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Abstract

Nanocrystalline and ultrafine-grained materials are commonly known as materials with extraordinary mechanical properties. High Pressure Torsion (HPT) is a simple and effective severe plastic deformation method to produce these ultrafine grained or even nanocrystalline microstructures. However, at a certain applied strain no further refinement of the microstructure occurs. In this work, a strategy to bypass this limitation in the grain refinement and a way to generate stable nanocrystallites using HPT deformation are presented. Initial micrometrer-sized powders are oxidized by an annealing treatment and subsequently HPT-consolidated until a fully dense bulk material is obtained. This processing route offers an easy way to produce bulk nanocrystalline metal matrix composites with nanometre-sized oxide dispersions. The incorporated oxides have a huge impact on the final microstructure, as well as on the mechanical properties and the thermal stability of the consolidated material.

Nanocrystalline and ultrafine-grained materials are commonly known as materials with extraordinary mechanical properties. High Pressure Torsion (HPT) is a simple and effective severe plastic deformation method to produce these ultrafine grained or even nanocrystalline microstructures. However, at a certain applied strain no further refinement of the microstructure occurs. In this work, a strategy to bypass this limitation in the grain refinement and a way to generate stable nanocrystallites using HPT deformation are presented. Initial micrometrer-sized powders are oxidized by an annealing treatment and subsequently HPT-consolidated until a fully dense bulk material is obtained. This processing route offers an easy way to produce bulk nanocrystalline metal matrix composites with nanometre-sized oxide dispersions. The incorporated oxides have a huge impact on the final microstructure, as well as on the mechanical properties and the thermal stability of the consolidated material.

Keywords

Nanocrystalline

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