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Titolo:
STATISTICAL ALCHEMI - GENERAL FORMULATION AND METHOD WITH APPLICATIONTO TI-AL TERNARY ALLOYS
Autore:
ROSSOUW CJ; FORWOOD CT; GIBSON MA; MILLER PR;
Indirizzi:
CSIRO,DIV MAT SCI & TECHNOL,PRIVATE BAG 33,ROSEBANK MDC CLAYTON VIC 3169 AUSTRALIA
Titolo Testata:
Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
fascicolo: 1, volume: 74, anno: 1996,
pagine: 57 - 76
SICI:
1364-2804(1996)74:1<57:SA-GFA>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ELECTRON-CHANNELING ANALYSIS; ENHANCED MICROANALYSIS; DIFFRACTION CONDITIONS; INELASTIC-SCATTERING; SITE-OCCUPANCY; ATOM LOCATION; CRYSTALS; DELOCALIZATION; IONIZATION; PEROVSKITE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
33
Recensione:
Indirizzi per estratti:
Citazione:
C.J. Rossouw et al., "STATISTICAL ALCHEMI - GENERAL FORMULATION AND METHOD WITH APPLICATIONTO TI-AL TERNARY ALLOYS", Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties, 74(1), 1996, pp. 57-76

Abstract

Recent advances in the theory of characteristic X-ray emission from crystals under dynamic electron diffraction conditions are used in developing a new fully quantitative statistical method for atom location by channelling-enhanced microanalysis (ALCHEMI). Limitations imposed bydelocalization, disorder and occupancy of interstitial sites are clarified. A fully computerized method for automated data collection and analysis from incoherent channelling patterns formed by the variation in characteristic X-ray emission as a function of orientation is used for the first time. The precision and accuracy of this method are investigated using both experimental and simulated data from the ordered gamma-phase in ternary Ti-Al alloys. It is shown that 1 at.% Ga, Hf and Mo additions partition onto Al sites, Ti sites and both sites respectively, and contrast in X-ray incoherent channelling patterns confirms that these ternary atoms are not located on interstitial sites. The traditional ratio ALCHEMI technique is shown to have severe limitations in comparison with statistical methods.

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Documento generato il 07/07/20 alle ore 05:45:08