Consolidation of rapidly solidified Al-Si powders by the strained powder rolling method

Abstract

Rapidly solidified Al-Si ribbons prepared by the single roller method were pulverized by the use of vibration mill. The milled powders were consolidated at different temperatures by the strained powder rolling method. P/M alloys have a density more than 95% of that of metal mold cast alloys. Hypereutectic P/M alloys have uniform distribution of fine Si particles in the structure. When rolled at 573K, the Siparticles are 1 to 5μm in diameter. P/M alloys harden with increasing Si content and soften at higher rolling temperatures. Tensile strength and elongation of P/M alloys are higher than those of metal mold cast alloys containing Si 20at% or more. 30at% Si P/M alloy has tensile strength about 33kg/mm² and elongation about 5%.