Alloy and method for producing objects therefrom

A method of manufacturing cylinder liners and hydraulic or pneumatic working cylinders comprising the steps of:

• preparing an aluminum alloy consisting of a readily hot-deformable wrought aluminum alloy matrix of the type Al Mg Si Cu with a composition out of which no silicon primary crystals can crystallize, with a finely dispersed wear-resistance-increasing addition of at least one of uniformly distributed silicon particles and particles of a hypereutectic aluminum/silicon alloy, the individual particles of the hypereutectic aluminum silicon alloy having high silicon contents and the addition is at most 12% by weight silicon of the total silicon content of the aluminum alloy in the form of silicon particles and/or of silicon primary crystals in the particles of the hypereutectic aluminum/silicon alloy,
• preventing at least part of the silicon particles and/or primary crystals in the particles of the hypereutectic aluminum/silicon alloy from going into solution in the aluminum alloy matrix,
• preparing a billet from the alloy,
• hot deforming the billet by hot flow pressing into the cylinder liner or hydraulic or pneumatic working cylinder close to their final dimensions,
• wherein, the hot deforming step is controlled in such a way that the aluminum alloy which is processed into the cylinder liner or hydraulic or pneumatic working cylinder, after hot deformation and a subsequent optional heat treatment step, has a minimum content of silicon particles and/or silicon primary crystals which have not dissolved and have not separated out from the matrix alloy in the particles of the hypereutectic aluminum/silicon alloy relative to the total quantity of at least 5% by weight.