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Titre du document / Document title

Morphology and crystallography of β-Mg2Si precipitation in Al-Mg-Si alloys

Auteur(s) / Author(s)

OHMORI Yasuya (1) ; LONG CHAU DOAN (1) ; MATSUURA Yoshitsugu (1) ; KOBAYASHI Sengo (1) ; NAKAI Kiyomichi (1) ;

Affiliation(s) du ou des auteurs / Author(s) Affiliation(s)

(1) Department of Materials Science and Engineering, Ehime University, Matsuyama 790-8577, JAPON

Résumé / Abstract

The exothermic reaction occurring after β precipitation in Al-Mg-Si alloys has been investigated by means of differential scanning calorimetry (DSC) and transmission electron microscopy (TEM). The reaction peak height observed in DSC increases with increasing excess Mg or decreasing excess Si content from Al-Mg2Si quasi-binary composition. It was confirmed that this reaction peak arises from the precipitation of cuboid β-Mg2Si particles related to the matrix with the cube-cube orientation relationship. At the later stage of ageing, thin β-Mg2Si plates nucleate at the cuboid β-phase particles. The orientation relationship of them is rotated 45° or 18.4° in the further aged specimens about the direction normal to the {001}Al II {001}β habit plane from the cube-cube relationship. The changes in morphology and the crystallography of the β-Mg2Si precipitates with the progress of ageing can be explained qualitatively in terms of coherency and interface energy of the precipitates.

Revue / Journal Title

Materials transactions - JIM    ISSN  0916-1821 

Source / Source

2001, vol. 42, no12, pp. 2576-2583 (16 ref.)

Langue / Language

Anglais

Editeur / Publisher

Japan Institute of Metals, Sendai, JAPON  (1989-2000) (Revue)

Mots-clés anglais / English Keywords

Experimental study

;

Microstructure

;

Electron diffraction

;

Transmission electron microscopy

;

Exothermic reaction

;

DSC

;

Silicon alloys

;

Magnesium alloys

;

Aluminium base alloys

;

Precipitation

;

Crystallography

;

Morphology

;

Mots-clés français / French Keywords

Etude expérimentale

;

Microstructure

;

Diffraction électron

;

Microscopie électronique transmission

;

Réaction exothermique

;

DSC

;

Silicium alliage

;

Magnésium alliage

;

Alliage base aluminium

;

Précipitation

;

Cristallographie

;

Morphologie

;

Mots-clés espagnols / Spanish Keywords

Reacción exotérmica

;

Localisation / Location

INIST-CNRS, Cote INIST : 10153, 35400010016773.0170

Nº notice refdoc (ud4) : 13469050



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