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Preparation and Mechanical Properties of Ultrafine Grained Metals

Published online by Cambridge University Press:  28 February 2011

B. Gunther ,
A. Baalmann  and
H. Weiss
B. Gunther
Affiliation:
Fraunhofer-Institute for Applied Materials Research, Lesumer Heerstr. 36, 2820 Bremen 77, F.R.G.
A. Baalmann
Affiliation:
Fraunhofer-Institute for Applied Materials Research, Lesumer Heerstr. 36, 2820 Bremen 77, F.R.G.
H. Weiss
Affiliation:
Fraunhofer-Institute for Applied Materials Research, Lesumer Heerstr. 36, 2820 Bremen 77, F.R.G.
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Abstract

Ultrafine—grained polycrystalline metallic components (Cu, Au, Fe) have been prepared by means of the inert gas evaporation technique combined with an integrated uniaxial cold compaction device. The average grain sizes ranaed typically from 20 nm to about 100 nm. The microstructure and Imourity content of the as-pressed samples have been investigated by means of TEM and AES, respectively. The yield strength of ultrafine (30 nm) grained Cu specimens obtained in tensile tests compares well with respective values for heavily cold—worked coarse grained copper. Al slight heat treatment (150ºC/30min) improves the strain—to—fracture at slightly reduced yield strength values. The results are discussed within the picture of two concurrent processes determining the strength of ultrafine grained metals: Coble creep vs. grain boundary strengthening effect.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 195: Symposium S – Physical Phenomena in Granular Materials , 1990 , 611
Copyright
Copyright © Materials Research Society 1990

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References

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