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Titolo:
Formation of a TiN/Ti5Si3 nano-grain composite by a non-equilibrium PM process
Autore:
Suehiro, Y; Ameyama, K;
Indirizzi:
Ritsumeikan Univ, Coll Sci & Engn, Dept Mech Engn, Shiga 5258577, Japan Ritsumeikan Univ Shiga Japan 5258577 ept Mech Engn, Shiga 5258577, Japan
Titolo Testata:
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
fascicolo: 1-3, volume: 111, anno: 2001,
pagine: 118 - 121
SICI:
0924-0136(20010425)111:1-3<118:FOATNC>2.0.ZU;2-0
Fonte:
ISI
Lingua:
ENG
Soggetto:
ALLOYED POWDER;
Keywords:
non-equilibrium PM process; mechanical alloying (MA); TiN/Ti5Si3 composite;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
4
Recensione:
Indirizzi per estratti:
Indirizzo: Ameyama, K Ritsumeikan Univ, Coll Sci & Engn, Dept Mech Engn, 1-1-1 Noji Higashi, Shiga 5258577, Japan Ritsumeikan Univ 1-1-1 Noji Higashi Shiga Japan 5258577 Japan
Citazione:
Y. Suehiro e K. Ameyama, "Formation of a TiN/Ti5Si3 nano-grain composite by a non-equilibrium PM process", J MATER PR, 111(1-3), 2001, pp. 118-121

Abstract

In the present paper. the authors have proposed a non-equilibrium powder metallurgy (PM) process which enables improved formability and the production of a (TiN + Ti5Si3) composite. The microstructure and high-temperature deformation behavior of Ti-Si3N4 mechanically alloyed (MA) powder compacts were investigated. Powders of the elements Ti and Si3N4 of composition Ti-20 mass%Si3N4 were blended for MA. The MA process for 720 ks resulted in the formation of amorphous and alpha -Ti phases. These phases changed to TiN, Ti2N and Ti5Si3 phases after heat treatment at elevated temperatures. A (TiN Ti5Si3) ultra-fine microduplex structure was obtained after heat treatment at 1473 K for 3.6 ks. The amorphous and alpha -Ti phases were stable evenafter vacuum hot pressed (VHP) at 803 K, while they disappeared and alpha -Ti. Ti2N and Ti5Si3 phases appeared in 813 and 823 K VHP specimens. Compression tests revealed that the 803 K VHP specimen with the non-equilibrium phases had the lowest flow stress at 993 K and an initial strain rate of 4.2x 10(-4) s(-1) in these three VHP specimens. The slower strain rate test produced a larger amount of harder phases such as TiN, Ti2N and Ti5Si3. Therefore, there exists an appropriate condition for a low temperature and highstrain rate forming process. A (TiN + Ti5Si3) microduplex structure was also obtained in the specimen compressed to 25% after annealing at 1473 K for3.6 ks. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 16/07/20 alle ore 05:39:28