Mechanical properties of hypereutectic Al-Si alloy by semisolid processing①
(1. Foundry Institute, University of Science and Technology Beijing, Beijing 100083, P.R.China;
2. Beijing Institute of Aeronautical Materials, Beijing 100095, P.R.China)
2. Beijing Institute of Aeronautical Materials, Beijing 100095, P.R.China)
Abstract: Semisolid hypereutectic Al-Si alloy billets were obtained by electromagnetic stirring, in which microstructure of primary silicon gets rounder and there are a large number of rosetteαphases appearing. Compared with conventional gravity die casting alloys, the tensile strength and elongation of semisolid forming hypereutectic Al-Si get obviously improved. Change of primary silicon morphology of semisolid hypereutectic Al-Si alloy made by electromagnetic stirring is the main reason of better tensile strength, and a large number of rosetteαphases precipitation is the main reason of better elongation.
Key words: semisolid processing; hypereutectic Al-Si alloy; tensile strength; elongation