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Titolo:
ALLOYING EFFECTS ON SUPERPLASTIC BEHAVIOR OF TI-FE-AL-NI ALLOYS
Autore:
KIM JS; LI DM; LEE CS;
Indirizzi:
POHANG UNIV SCI & TECHNOL,CTR ADV AEROSP MAT POHANG SOUTH KOREA
Titolo Testata:
Materials science and technology
fascicolo: 7, volume: 14, anno: 1998,
pagine: 676 - 682
SICI:
0267-0836(1998)14:7<676:AEOSBO>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENHANCED GRAIN-GROWTH; TI-6AL-4V ALLOY; DEFORMATION MECHANISMS; INTER-CRYSTALLINE; STRAIN; FLOW; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
49
Recensione:
Indirizzi per estratti:
Citazione:
J.S. Kim et al., "ALLOYING EFFECTS ON SUPERPLASTIC BEHAVIOR OF TI-FE-AL-NI ALLOYS", Materials science and technology, 14(7), 1998, pp. 676-682

Abstract

The aim of the present investigation was to develop a new titanium alloy with improved superplastic performance (higher elongation and lower forming temperature) through alloying with iron, nickel, and aluminium. A total of nine alloy compositions were used in which the iron content was fixed while nickel and aluminium contents were varied. Superplastic tension tests were conducted at various temperatures in the range 625-750 degrees C with a strain rate of 10(-3) s-(1). Step strain rate tests were performed in a strain rate range 10(-4)-2.5 x 10(-2) s(-1) at 700, 725, and 750 degrees C to study some important superplastic deformation properties. The alloy Ti-5Fe-4Al-2Ni proved to be promising in that it gave a large elongation of more than 1500% at a low deformation temperature of 650 degrees C, which was possible mainly because of the existence of iron and nickel. Alloying with nickel within a suitable amount was found to increase the strain rate sensitivity and to decrease the flow stress, while the effect of aluminium addition was found to be insignificant regarding superplastic behaviour; but its content should be limited. Possible mechanisms for superplasticity in the present alloy system are also discussed. MST/3670.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 14/11/18 alle ore 03:42:17