Open AccessELECTRON DIFFRACTION ANALYSIS OF THE TWIN AND HCP PHASE FORMED IN A FCC CRYSTAL
Author(s) -
Kaihua Guo
Publication year - 1978
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.27.547
Subject(s) - electron diffraction , diffraction , phase (matter) , crystallography , materials science , crystal (programming language) , electron , electron backscatter diffraction , selected area diffraction , crystal twinning , condensed matter physics , physics , optics , chemistry , microstructure , quantum mechanics , computer science , programming language
1. After transforming the zone axis [uvw] of a FCC crystal into [utvtwt] of its twin or [u′v′w′] of the HCP phase formed in it, it is possible to recognize immediately from these indices whether the electron diffraction pattern of the latter is distinct from that of the former.2. The qpndition for the twin to have a non-distinct pattern is: u(t2)+v(t2)+w(t2)>u2+v2+w2. 3. The condition for the HCP phase to have a non-distinct pattern is: u′,v′≠3n, u′+v′=3n. 4. As far as the low zone indices (u, v, w≤4) electron diffraction patterns of a FCC crystal are concerned, approximately 80% of the twin or HCP phase are not discernible by electron diffraction analysis.