Atomic arrangement and the formation of partially coherent interfaces in the Ti-V-N system
- McMaster Univ., Hamilton, Ontario (Canada). Dept. of Materials Science and Engineering
- Academy of Sciences, Brno (Czech Republic). Inst. of Physics of Materials
The precipitation of (V,Ti) (bcc structure) in a (Ti,V)N (NaCl structure) matrix is considered in the current study. The lattice parameter ratio of this system, a{sub f}/a{sub b} = 1.34, is quite different from most previous studies (a{sub f}/a{sub b} {approximately} 1.26) and provides an opportunity to test recent models proposed for the formation of precipitate morphology and the interface structure. Like many other fcc:bcc precipitation systems, the Ti-V-N system involves an invariant line transformation strain. In this system, the invariant line is associated with a high-index orientation relationship (OR). The observed OR is in good agreement with a predicted relationship based upon a geometric matching criterion proposed by Ryan et al. The Burgers vectors for the interfacial defects were determined directly by making high-resolution transmission electron microscope (HRTEM) observations along three different directions. The observations confirm that the formation of the precipitate facets, the spacings of misfit dislocations, and the direction of interfacial defects all agree with atom-matching considerations.
- OSTI ID:
- 651059
- Journal Information:
- Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Vol. 29, Issue 8; Other Information: PBD: Aug 1998
- Country of Publication:
- United States
- Language:
- English
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