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Titolo:
Observations of crack tip process zones in cubic titanium trialuminide intermetallics
Autore:
Varin, RA; Zbroniec, L; Chiu, C;
Indirizzi:
Univ Waterloo, Dept Mech Engn, Waterloo, ON N2L 3G1, Canada Univ WaterlooWaterloo ON Canada N2L 3G1 gn, Waterloo, ON N2L 3G1, Canada Natl Inst Mat & Chem Res, Tsukuba, Ibaraki 3058565, Japan Natl Inst Mat & Chem Res Tsukuba Ibaraki Japan 3058565 aki 3058565, Japan
Titolo Testata:
INTERMETALLICS
fascicolo: 10-11, volume: 9, anno: 2001,
pagine: 937 - 941
SICI:
0966-9795(200110/11)9:10-11<937:OOCTPZ>2.0.ZU;2-M
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRACTURE-TOUGHNESS;
Keywords:
titanium trialuminides; fracture mode;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Varin, RA Univ Waterloo, Dept Mech Engn, Waterloo, ON N2L 3G1, Canada UnivWaterloo Waterloo ON Canada N2L 3G1 oo, ON N2L 3G1, Canada
Citazione:
R.A. Varin et al., "Observations of crack tip process zones in cubic titanium trialuminide intermetallics", INTERMETALL, 9(10-11), 2001, pp. 937-941

Abstract

Despite the fact that the single-phase L1(2)-ordered titanium trialuminides, derived from D0(22)-ordered Al3Ti by alloying with fourth-period transition elements such as Cr, Mn, Fe, Co, Ni, Cu, and Zn have a cubic lattice structure, their room temperature fracture toughness remains quite low (4-5 MPa m(1/2)). In general process zones developed at the crack tips determine the fracture toughness of a material. In this work the results of the cracktip fracture studies of cubic (L1(2)) Al3Ti alloys stabilized with Mn are presented. The process zones at the crack tip in nearly stoichiometric single-phase L1(2) 9Mn-25Ti (at.%) titanium trialuminides were not observed in most of the specimens studied. Occasionally, two types of process zones were observed: either small, heavily localized process-plastic zones accompanied by a crack tip "collapse", or "pseudo-bifurcated" ones, reminiscent of those in brittle ceramics. Observations of the crack ti process zones in multiphase, high Ti (up to similar to 33 at.%), B-doped trialuminides, exhibiting increased fracture toughness (similar to 7 MPa m(1/2)), show the presence of secondary microcracks in the zone ahead of the crack tip and adjacentto the propagating crack, and more plasticity at the crack tip. (C) 2001 Elsevier Science Ltd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 05:18:54