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Titolo:
Effect of nitridation on the oxidation behavior of TiAl-based intermetallic alloys
Autore:
Zhao, B; Wu, JS; Sun, J; Tu, BJ; Wang, F;
Indirizzi:
Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Minist Educ High Temp Mat & Tests, Key Lab, Shanghai 200030, Peoples R China Shanghai Jiao Tong Univ Shanghai Peoples R China 200030 Peoples R China
Titolo Testata:
INTERMETALLICS
fascicolo: 8, volume: 9, anno: 2001,
pagine: 697 - 703
SICI:
0966-9795(200108)9:8<697:EONOTO>2.0.ZU;2-X
Fonte:
ISI
Lingua:
ENG
Soggetto:
NITROGEN; KINETICS;
Keywords:
aluminides; miscellaneous; titanium aluminides; based on TiAl; oxidation; surface properties; coatings; intermetallic and otherwise;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Zhao, B Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Minist Educ High TempMat & Tests, Key Lab, Shanghai 200030, Peoples R China Shanghai Jiao Tong Univ Shanghai Peoples R China 200030 R China
Citazione:
B. Zhao et al., "Effect of nitridation on the oxidation behavior of TiAl-based intermetallic alloys", INTERMETALL, 9(8), 2001, pp. 697-703

Abstract

In the present work, gas nitridation of the TiAl based alloys in an ammonia atmosphere was carried out at 800. 860 and 940 degreesC for different time. respectively. The nitride layers were characterized by X-ray diffraction(XRD), electron probe micro-analyzer (EPMA) and scanning electron microscopy (SEM). The composite of the nitride layers (Ti,AIN as the inner layer and TiN as the outer laver) and the diffusing layer formed on the surface of the TiAl based alloys. The oxidation behavior of the nitrided alloys in airwas studied between 800 and 1000 degreesC. The scales were characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM) with energy dispersive X-ray (EDX) analysis. Generally an oxide scale consisting of two layers, an outward- and an inward-growing layer, formed. The outward-growing part of the scale consisted of mainly of TiO2 (rutile), while the inward-growing part was composed mainly of alpha -Al2O3. Due to more alpha -Al2O3 formed in the outward-growing part., the non-nitrided alloys showed better oxidation resistance than the nitrided alloys, On the observation of theEDX measurement, the alloys nitrided at 940 degreesC for 50 h grew more alpha -Al2O3 with fine grains on the outer layer of its scale after 100 h exposure time at 1000 degreesC. Because of its significant transient oxidationat the initial period, it displayed worse resistance. It is concluded thatthe high-temperature nitrided alloys exhibit better oxidation resistance at 1000 degreesC. (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 11/07/20 alle ore 16:56:28