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Microstructure and Hall–Petch Behavior of Fe–Co-based Hiperco© Alloysa)

Published online by Cambridge University Press:  31 January 2011

Chang-He Shang ,
R. C. Cammarata ,
T. P. Weihs  and
C. L. Chien
Chang-He Shang
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218
R. C. Cammarata
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218
T. P. Weihs
Affiliation:
Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218
C. L. Chien
Affiliation:
Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218
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Abstract

The microstructure and hardness of Fe–Co-based Hiperco© alloys were investigated. Scanning electron microscopy revealed elongated grains in the as-received (cast and cold-rolled) alloys, and samples containing Nb had second phase precipitates. Annealing of alloys for 1 to 3 h at temperatures in the range 700 to 800 °C resulted in grains becoming equiaxed. In the Nb-containing alloys, the original precipitates dissolved and new precipitates appeared. The rate of grain growth decreased with increasing Nb content, suggesting that Nb or Nb-containing precipitates were responsible for a reduction in the grain boundary mobility. The hardness as a function of grain size in the annealed samples of all of the alloys could be plotted on the same Hall–Petch curve, indicating that the yield strength of these alloys is governed by the grain size, independent of the alloy composition and volume fraction of precipitates.

Type
Rapid Communications
Information
Journal of Materials Research , Volume 15 , Issue 4 , April 2000 , pp. 835 - 837
Copyright
Copyright © Materials Research Society 2000

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References

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