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Titolo:
DIFFRACTION CONTRAST IMAGES OF SMALL STACKING-FAULT TETRAHEDRA IN FCCMETALS
Autore:
SATOH Y; TAOKA H; KOJIMA S; YOSHIIE T; KIRITANI M;
Indirizzi:
NAGOYA UNIV,DEPT NUCL ENGN NAGOYA AICHI 464 JAPAN KYOTO UNIV,INST RES REACTOR OSAKA 59004 JAPAN HOKKAIDO UNIV,DEPT PRECIS ENGN SAPPORO HOKKAIDO 060 JAPAN
Titolo Testata:
Philosophical magazine. A. Physics of condensed matter. Defects and mechanical properties
fascicolo: 5, volume: 70, anno: 1994,
pagine: 869 - 891
SICI:
0141-8610(1994)70:5<869:DCIOSS>2.0.ZU;2-V
Fonte:
ISI
Lingua:
ENG
Soggetto:
CENTERED-CUBIC METALS; IRRADIATION; SUBCASCADE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
21
Recensione:
Indirizzi per estratti:
Citazione:
Y. Satoh et al., "DIFFRACTION CONTRAST IMAGES OF SMALL STACKING-FAULT TETRAHEDRA IN FCCMETALS", Philosophical magazine. A. Physics of condensed matter. Defects and mechanical properties, 70(5), 1994, pp. 869-891

Abstract

Transmission electron microscopy images of stacking fault tetrahedra (SFTs) are studied in detail both experimentally and by image simulation. Experimental dark-field diffraction contrast images of SFTs are examined under various conditions. The image contrast of stacking faultsand stair-rod dislocations are simulated based on standard multi-beamdynamical theory, and the image contrast of very small SFTs (< 2.6 nm) is calculated by the multi-slice method. The correspondence between experimental and calculated results under systematically varied conditions is quite satisfactory. Stacking faults make a larger contributionto the total SFT image than stair-rod dislocations. The images are generally smaller than the SFT. The difference in size depends on many parameters such as deviation from the Bragg condition, location in the foil, and specimen thickness. However, the difference is always smaller than the fringe spacing in the stacking fault image, and is generally smaller at a larger deviation from the Bragg condition. SFTs smallerthan the fringe spacing are sometimes indistinguishable in contrast. The diffracting vector of 200 achieves higher visibility than any other diffracting vectors. The visibility ratio is higher at larger deviations from the Bragg condition. Multi-slice calculations suggest that SFTs smaller than 1 nm can be detected by weak-beam diffraction contrast methods. Suitable observing conditions for data acquisition in radiation damage studies are proposed.

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Documento generato il 30/11/20 alle ore 10:23:42