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Formation And Stability Of Nanocrystalline Nb-Cu Alloys

Published online by Cambridge University Press:  25 February 2011

Yoshio R. Abe ,
J. C. Holzer  and
W. L. Johnson
Yoshio R. Abe
Affiliation:
California Institute of Technology, W. M.Keck Laboratories of Engineering Materials, Pasadena CA 91125, U.S.A.
J. C. Holzer
Affiliation:
California Institute of Technology, W. M.Keck Laboratories of Engineering Materials, Pasadena CA 91125, U.S.A.
W. L. Johnson
Affiliation:
California Institute of Technology, W. M.Keck Laboratories of Engineering Materials, Pasadena CA 91125, U.S.A.
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Abstract

Nanocrystalline Nb100−xCux (0 ≤ x ≤ 30) alloys of 8 – 25 nm grain size are synthesized with the mechanical alloying technique. Differential scanning calorimetry reveals two separate stages of grain growth. In the first stage, the grain growth is associated with migration of solute Cu atoms to grain boundaries. Grain growth stops as the grain boundaries are saturated with Cu. The second reaction takes place either when the threshold for the nucleation of an Fcc Cu phase in the grain boundary is overcome by thermal activation, or when segregating Cu atoms in the grain boundary are driven by diffusion to the growing Cu grains, and the Cu concentration in the grain boundary drops. This increases the grain boundary energy, and initiates a second stage of rapid grain growth.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 238: Symposium Cb – Structure and Properties of Interfaces in Materials , 1991 , 721
Copyright
Copyright © Materials Research Society 1992

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