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Titolo:
STATIC STRENGTHS OF TA AND U UNDER ULTRAHIGH PRESSURES
Autore:
WEIR ST; AKELLA J; RUDDLE C; GOODWIN T; HSIUNG L;
Indirizzi:
LAWRENCE LIVERMORE NATL LAB,POB 808 LIVERMORE CA 94551
Titolo Testata:
Physical review. B, Condensed matter
fascicolo: 17, volume: 58, anno: 1998,
pagine: 11258 - 11265
SICI:
0163-1829(1998)58:17<11258:SSOTAU>2.0.ZU;2-W
Fonte:
ISI
Lingua:
ENG
Soggetto:
DIAMOND; STRESS; STRAIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
17
Recensione:
Indirizzi per estratti:
Citazione:
S.T. Weir et al., "STATIC STRENGTHS OF TA AND U UNDER ULTRAHIGH PRESSURES", Physical review. B, Condensed matter, 58(17), 1998, pp. 11258-11265

Abstract

We have performed high-pressure strength experiments on tantalum and uranium using a diamond-anvil cell. These experiments determined the: flow stresses of tantalum and uranium at room temperature and in the low strain rate limit (epsilon'<10(-6) sec(-1)) by using x-ray diffraction to measure the pressure gradients in the samples. We find that theflow stresses increase dramatically with increasing pressure and strain, with the flow stress of Ta reaching 10.3 GPa at a pressure of 85.8GPa and an estimated strain of approximate to 90%, and the flow stress of U reaching 19.8 GPa at a pressure of 109.0 GPa and an estimated strain of approximate to 70%. With further increases in pressure and strain, the flow stresses decrease. This apparent strain-softening effect has also been observed in static high-pressure how stress experiments on other materials, and has been suggested to be due to either material damage or preferred orientation of grains induced by large strains. [S0163-1829(98)05141-8].

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/11/20 alle ore 10:01:25