Process for obtaining a low silicon aluminium alloy part

A method of obtaining a part made of low-silicon aluminum alloy, containing the alloy comprising:

• silicon at a content lying in the range of 0.5% to 3%;
• magnesium at a content lying in the range of 0.65% to 1%;
• copper at a content lying in the range of 0.20% to 0.40%;
• manganese at a content lying in the range of 0.15% to 0.25%;
• titanium at a content lying in the range of 0.10% to 0.20%;
• and
• strontium at a content lying in the range of 0 ppm to 120 ppm;
• said method including:
• casting said alloy in a mold so as to obtain the part;
• after the casting, demolding the part constituting a preform that is still hot;
• cooling said preform and then subjecting said preform to an operation adapted for reheating saisd preform to a temperature lying in the range of 470° C. to 550° C.;
• positioning said part between two shells of a die that defines a cavity of dimensions substantially equal to but less than the dimensions of the cavity of the mold;
• and
• strongly pressing the two shells together to exert on the part disposed between said shells a combined effect of pressing and surface kneading.