Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
DETECTION OF PHASE AND ANTISITE STRUCTURE OF TI-AL ALLOYS BY AL-27 SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE
Autore:
SMITH ME; GIBSON MA; FORWOOD CT; BASTOW TJ;
Indirizzi:
CSIRO,DIV MAT SCI & TECHNOL,PRIVATE BAG 33,ROSEBANK MDC CLAYTON VIC 3169 AUSTRALIA UNIV KENT,DEPT PHYS CANTERBURY CT2 7NR KENT ENGLAND
Titolo Testata:
Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties
fascicolo: 3, volume: 74, anno: 1996,
pagine: 791 - 809
SICI:
1364-2804(1996)74:3<791:DOPAAS>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
GAMMA-TITANIUM ALUMINIDES; INTERMETALLIC ALLOYS; NMR; TRANSFORMATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
31
Recensione:
Indirizzi per estratti:
Citazione:
M.E. Smith et al., "DETECTION OF PHASE AND ANTISITE STRUCTURE OF TI-AL ALLOYS BY AL-27 SOLID-STATE NUCLEAR-MAGNETIC-RESONANCE", Philosophical magazine. A. Physics of condensed matter. Structure, defects and mechanical properties, 74(3), 1996, pp. 791-809

Abstract

Static room-temperature Al-27 nuclear magnetic resonance (NMR) spectra for Tit-xAlx alloys in the range 0.25 less than or equal to x less than or equal to 0.55 are reported for the first time. The main resonances associated with the alpha(2) and gamma phases are clearly identified. The spectra follow the phase distribution in that, for samples annealed at 1473 K for 6h in the range 0.43 less than or equal to x less than or equal to 0.48, resonances from both alpha(2) and gamma are observed. Careful quantitative analysis of the Al-27 NMR spectra indicates that from single-phase samples all aluminium nuclei from the centraltransition are recorded, whereas for two-phase samples there is a loss of signal that is a consequence of the two-phase alloy microstructure. For the gamma-phase the NMR centre band shows a distinctive, largely second-order quadrupolar line shape together with associated satellite transitions which yield a quadrupolar coupling constant C-Q = 8.15 MHz and an axial Knight shift anisotropy of 130 ppm. For the alpha(2) phase the centre-band simulation requires only an axial Knight shift anisotropy of 270 ppm and no quadrupolar interaction. An additional resonance associated with the gamma-phase is also detected and quantified, and this is attributed to aluminium on antisites.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 03/07/20 alle ore 01:22:11