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Formation and morphology of Kurnakov type D022 compound in disordered face-centered cubic γ–(Ni, Fe) matrix alloys

Published online by Cambridge University Press:  01 January 2006

Akane Suzuki  and
Masao Takeyama
Akane Suzuki*
Affiliation:
Materials Science and Engineering, University of Michigan, Ann Arbor, Michigan 48109
Masao Takeyama
Affiliation:
Metallurgy and Ceramics Science, Tokyo Institute of Technology, Tokyo 152-8552, Japan
*
a)Address all correspondence to this author. e-mail: akanes@engin.umich.edu This paper was selected as the Outstanding Meeting Paper for the 2004 MRS Fall Meeting Symposium S Proceedings Vol. 842.
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Abstract

Formation and morphology of D022 compound Ni3V in γ face-centered cubic (fcc) matrix phase were investigated to understand fundamentals for controlling microstructure of alloys strengthened by Kurnakov-type geometrically close-packed (GCP) intermetallics. The D022 phase with plate-shaped morphology coherently precipitates in the γ + D022 two-phase region above the T0 line in Ni–V binary alloys. Due to the negative and positive lattice misfits along the a-axis and the c-axis of D022 (δa < 0 < δc), an invariant line exists between the two phases, and the morphology of D022 phase is changeable by controlling the two factors; the misfit strain ratio δc/δa is a decisive factor to determine the habit plane defined by the invariant line and one of the a-axes of D022, whereas the magnitude of |δa| is responsible for the shape of D022 phase with either prism or plate. These findings were extended to Ni–Fe–Nb–V system by partial replacement of Ni and V with Fe and Nb, respectively.

Keywords

Intermetallic alloysMorphologyPhase transformation
Type
Outstanding Meeting Papers: Articles
Information
Journal of Materials Research , Volume 21 , Issue 1 , January 2006 , pp. 21 - 26
Copyright
Copyright © Materials Research Society 2006

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