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Modification de l'alliage Al-Si par voie non conventionnelle
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ISBN10: 6208639638
ISBN13: 9786208639631
Publisher: Editions Notre Savoir
Published: Feb 9 2025
Pages: 84
Weight: 0.27
Height: 0.20 Width: 6.00 Depth: 9.00
Language: French
ISBN13: 9786208639631
Publisher: Editions Notre Savoir
Published: Feb 9 2025
Pages: 84
Weight: 0.27
Height: 0.20 Width: 6.00 Depth: 9.00
Language: French
Les alliages hypereutectiques Al-Si trouvent des applications dans les petits moteurs, les pistons des compresseurs de climatisation et d'autres composants de la transmission automatique. Ils sont légers et présentent une résistance à l'usure exceptionnelle, un coefficient de dilatation thermique plus faible et de très bonnes caractéristiques de moulage. L'utilisation de ces alliages est limitée par la présence d'une phase primaire de silicium extrêmement dure qui réduit leur usinabilité. Le présent travail tente d'améliorer les propriétés mécaniques des alliages hypereutectiques Al-17Si en modifiant le silicium primaire et le silicium eutectique par des moyens non conventionnels. Les alliages sont modifiés par l'ajout d'oxydes et de chlorures. L'effet des oxydes et des chlorures sur la morphologie et la taille des phases Si dans les alliages hypereutectiques Al-Si est étudié. Les propriétés mécaniques telles que la dureté, la résistance à la traction et l'allongement en % ont augmenté dans les alliages modifiés. L'amélioration des propriétés dépend de la distribution uniforme de fines particules fibreuses eutectiques d'Al-silicium et de fines particules primaires de Si-. Les résultats de ce travail devraient être utiles aux chercheurs universitaires et aux autres personnes intéressées par des informations utiles sur les alliages Al-Si.
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