Title: Preparation of nanocrystalline materials by PM methods

Authors: B. Gunther, H. Weiss

Addresses: Fraunhofer-Institut fur angewandte Materialforschung, Lesumer Heerstr. 36, 2820 Bremen 77, Germany. ' Fraunhofer-Institut fur angewandte Materialforschung, Lesumer Heerstr. 36, 2820 Bremen 77, Germany

Abstract: Nanocrystalline (nc-)solids with average grain sizes less than 100 nm are most conveniently produced by powder metallurgical methods. This is especially true for reactive powders (e.g. refractive metals) and for powder blends (alloys, composites), where mixtures of the components on a nanometer scale are a prerequisite for obtaining a homogeneous product. We have used the inert gas evaporation as a method to produce and consolidate various elemental powders within a single device. The microstructure of the resulting nc-components (d=20...100 nm) have been correlated with the respective mechanical properties. In general, cold-consolidated ultrafine grained elemental metals are characterized by a remarkably high strength.

Keywords: nanocrystalline materials; ultrafine powder; powder metallurgy; inert gas evaporation; gas condensation; microstructure; tensile strength.

DOI: 10.1504/IJMPT.1993.036554

International Journal of Materials and Product Technology, 1993 Vol.8 No.2/3/4, pp.424 - 429

Published online: 04 Nov 2010 *

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