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Titolo:
Evolution of high aspect ratio grains in a TiAl-based alloy by directionalgrain growth
Autore:
Tsujimoto, T; Matsui, T; Suzuki, T; Tomota, Y; Shibue, K; Furuyama, T;
Indirizzi:
Ibaraki Univ, Fac Engn, Dept Mat Sci, Hitachi, Ibaraki 3168511, Japan Ibaraki Univ Hitachi Ibaraki Japan 3168511 itachi, Ibaraki 3168511, Japan Sumitomo Light Met Ind Ltd, Minato Ku, Nagoya, Aichi, Japan Sumitomo LightMet Ind Ltd Nagoya Aichi Japan o Ku, Nagoya, Aichi, Japan
Titolo Testata:
INTERMETALLICS
fascicolo: 2, volume: 9, anno: 2001,
pagine: 97 - 106
SICI:
0966-9795(200102)9:2<97:EOHARG>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
MICROSTRUCTURE;
Keywords:
titanium aluminides; based on TiAl; texture; recrystallization and recovery; sintering; microstructure;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
8
Recensione:
Indirizzi per estratti:
Indirizzo: Tomota, Y Ibaraki Univ, Fac Engn, Dept Mat Sci, 4-12-1 Nakanarusawa, Hitachi, Ibaraki 3168511, Japan Ibaraki Univ 4-12-1 Nakanarusawa Hitachi IbarakiJapan 3168511 n
Citazione:
T. Tsujimoto et al., "Evolution of high aspect ratio grains in a TiAl-based alloy by directionalgrain growth", INTERMETALL, 9(2), 2001, pp. 97-106

Abstract

A concept of microstructural control named "directional grain growth" (DGG) has been proposed. In this method, local phase transition and grain growth are utilized for controlling grain shape and grain orientation in a restricted region for an inhomogeneous material in chemical composition which isgiven directionality by plastic deformation. In heat treatment for DGG, a seed grain grows preferentially in a shaped region without precipitates by being held at a relatively low temperature and then enlarges further by encroaching the surrounding region where precipitates vanish gradually with temperature elevating at a slow rate. Such a DGG heat treatment was applied to a Ti-45.6at%Al-1.7at.%Mn alloy fabricated by reactive sintering of an extruded mixture of elemental powders and contained inevitably directional inhomogeneity. As a result, a structure was obtained consisting of giant columnar grains of Al-bearing alpha Ti phase of several mm in length, 6.0 7.0 inaspect ratio and a preferred orientation. The axis of the columnar grains was approximately perpendicular to [0001](alpha). (C) 2001 Elsevier ScienceLtd. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/02/20 alle ore 07:15:22