The role of atomic matching and lattice correspondences in the selection of habit planes
- Exxon Research and Engineering Co., Clinton Township, NJ (United States). Corporate Research Lab.
- Virginia Polytechnic Inst. and State Univ., Blacksburg, VA (United States). Materials Science and Engineering Dept.
A procedure for predicting precipitate facet planes is demonstrated. The approach is based upon finding interphase boundaries with a high density of near-coincidence sites. Such near-coincidence site boundaries are identified by analyzing computer-generated lattice correspondences. For f.c.c./b.c.c. transformations, numerous lattice correspondences yield a similar degree of matching in 3-dimensions but substantially different matching in two-dimensions. The (1 {bar 2} 1)/f habit plane of precipitates in Ni-Cr is shown to be a near-coincidence site boundary in which each near-coincidence site lattice cell contains three atoms. This boundary is identified using a non-Bain type of lattice correspondence. However, the observed interfacial structure, growth direction, and facet planes of these precipitates suggest the selection of the habit plane results from geometric matching rather than the existence of a lattice correspondence during the growth process. A lattice correspondence is also proposed that explains the {l_brace}4 9 4{r_brace} habit plane of martensite in Fe-8Cr-1C.
- Sponsoring Organization:
- National Science Foundation, Washington, DC (United States)
- OSTI ID:
- 589983
- Journal Information:
- Acta Materialia, Journal Name: Acta Materialia Journal Issue: 11 Vol. 45; ISSN 1359-6454; ISSN ACMAFD
- Country of Publication:
- United States
- Language:
- English
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