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Titolo:
In-situ formation of nitride particle reinforced titanium aluminide by reactive plasma arc melting process
Autore:
Hirose, A; Abotani, K; Kobayashi, KF;
Indirizzi:
Osaka Univ, Dept Mfg Sci, Grad Sch Engn, Suita, Osaka 5650871, Japan OsakaUniv Suita Osaka Japan 5650871 ch Engn, Suita, Osaka 5650871, Japan
Titolo Testata:
MATERIALS TRANSACTIONS JIM
fascicolo: 2, volume: 42, anno: 2001,
pagine: 245 - 251
SICI:
0916-1821(200102)42:2<245:IFONPR>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
MECHANICAL-PROPERTIES; COMPOSITES; NITROGEN;
Keywords:
titanium aluminide; nitride; particle strengthening; intermetallic matrix composites; plasma arc melting process; nitrogen gas; in-situ formation; tensile strength; hardness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
16
Recensione:
Indirizzi per estratti:
Indirizzo: Hirose, A Kawasaki Steel Corp, Mizushima Works, Kawasaki, Kanagawa, Japan Kawasaki Steel Corp Kawasaki Kanagawa Japan i, Kanagawa, Japan
Citazione:
A. Hirose et al., "In-situ formation of nitride particle reinforced titanium aluminide by reactive plasma arc melting process", MATER T JIM, 42(2), 2001, pp. 245-251

Abstract

A reactive plasma are melting process using a mixture of Ar and N-2 as thecarrier gas for titanium and aluminum powders has been applied to synthesize nitride particle reinforced Ti-34mass%Al intermetallic matrix composites(IMCs). This technique successfully allowed to produce in-situ nitride particle dispersed IMCs and the volume fractions of nitride increased from 6 vol% to 54 vol% with increasing mixing ratios of N-2 gas from 10 vol% to 100vol%. In the IMCs both rod-like Ti(2)AIN and coarse two-phase nitride particles consisting of the core of TiN and the outer shell of Ti2AlN were formed in the matrix of a full lamellar structure or a lamellar containing small amount of equiaxed gamma phase structure. The IMCs had significantly finegrains of which size was about 1/4 that of the unreinforced Ti-34 mass%Al. The Rockwell hardness of the IMCs increased abruptly from 36.5 to 48.4H(RC) with increasing volume fraction of nitride. Unlike the hardness, the tensile strength of the IMCs had a maximum value of 507 MPa, which was approximately 170 MPa higher than that of the unreinforced Ti-34 mass%Al, at 13 vol% nitride, beyond which the strength decreased. The strengthening is derived from complex reinforcing effects of both direct strengthening effects of nitride particles due to the interaction of dislocations with the particlesand grain refinement. The degradation in tensile strength at higher volumefractions of nitride is considered to be attributed to higher population of clustered coarse two-phase nitride particles, which can act as crack initiation and propagation sites. As for the strength at elevated temperatures,the IMC with 13 vol% nitride had higher tensile strengths than the unreinforced Ti-34 mass%Al by 100 MPa at 1173 K and 61 MPa at 1273 K.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 06:21:21