On misfit-compensating ledges/disconnections

Citation
Mg. Hall et al., On misfit-compensating ledges/disconnections, ACT MATER, 49(17), 2001, pp. 3487-3492
Citations number
26
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science","Material Science & Engineering
Journal title
ACTA MATERIALIA
ISSN journal
13596454 → ACNP
Volume
49
Issue
17
Year of publication
2001
Pages
3487 - 3492
Database
ISI
SICI code
1359-6454(20011009)49:17<3487:OML>2.0.ZU;2-X
Abstract
The evidence for and use of the term misfit-compensating ledge or disconnec tion as a description for a type of defect found at some interphase boundar ies is reviewed and further developed, Analyses are presented for the fcc/h cp, trigonal/hcp and bcc/hep boundary cases and a new computer near coincid ence site (NCS) simulation of the bcc/hep case is under-taken. The results of the NCS analysis are in good agreement with previous O-lattice modeling. These results are also equivalent to those obtained by direct inspection o f the dichromatic complex of the structures forming the interface. The anal yses were compared with TEM observations of interphase boundaries formed in a Ti-6.62%Cr alloy where the disconnections were observed to be arranged i n pairs and to have Burgers vectors with a component of 1/2[0001], The obse rvations are interpreted in terms of the dichromatic complex. (C) 2001 Acta Materialia Inc. Published ky Elsevier Science Ltd. All rights reserved.