Aluminium Pechiney

Willem Loue

Michel Garat

Christian Pluchon

Marc Tavernier

Michel Brimont

A metal alloy mass of a defined porosity for forming in the semi-solid state. When the porosity is measured by cooling in ambient air from a temperature corresponding to a liquid fraction ratio between 30 and 70% to the ambient temperature, the mass has a porosity ratio, measured by image analysis, between 2 and 20%, and preferably between 3 and 8%. Alternatively, when the gassing level is measured by a solidification test under 80 hPa, the mass has a volumetric porosity ratio between 3 and 50% and preferably between 4 and 25%.

Metal alloy mass for forming in the semisolid state

The invention relates to an aluminum alloy for thixoforming with the composition (by weight): Si: 5%-7.2% Cu: 1%-5% Mg&lt;1% Zn&lt;3% Fe&lt;1.5% other elements&lt;1% each and&lt;3% in total, with % Si&lt;7.5-% Cu/3, which, when reheated to the semisolid state to the point at which a liquid fraction ratio between 35 and 55% is obtained, has an absence of non-remelted polyhedral silicon crystals.

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Chirens, France

Willem Loue