ALUMINUM-SILICON ALLOYS HAVING IMPROVED MECHANICAL PROPERTIES

ALUMINUM-SILICON ALLOYS HAVING IMPROVED MECHANICAL PROPERTIES

The invention relates to a heat treatment method for articles composed of substantially Al-Si alloys that contain a eutectic phase, and to articles that consist of these alloys. In order to improve the ductility of the material or to increase the elongation after fracture, an annealing process is ca...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser: WOEHRER, JOSEF, UGGOWITZER, PETER, OGRIS, ERHARD
Format: Patent
Sprache:eng ; fre
Schlagworte:
ALLOYS
CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS ANDNON-FERROUS ALLOYS
CHEMISTRY
FERROUS OR NON-FERROUS ALLOYS
METALLURGY
TREATMENT OF ALLOYS OR NON-FERROUS METALS
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Beschreibung
Zusammenfassung:The invention relates to a heat treatment method for articles composed of substantially Al-Si alloys that contain a eutectic phase, and to articles that consist of these alloys. In order to improve the ductility of the material or to increase the elongation after fracture, an annealing process is carried out in the form of shock annealing, said process comprising the following steps: rapidly heating the material to an annealing temperature of from 400 to 555 ~C, maintaining it at this temperature for a period of not more than 14.8 minutes, force-cooling it, and then aging the article. The inventive article comprises spheroidized silicon precipitations in the eutectic phase portion with an average plane of section ASi of less than 4 µm2 and/or an average distance between the silicon particles .lambda.Si of less than 4 µm and/or an average spheroidization density .xi.Si of greater than 10.