Abstract
Rapidly solidified flakes of Al-2 to 8wt%Fe alloys were produced by atomizing the alloy melt and subsequent splat quenching onto a water-cooled copper roll. Mechanical alloying treatment (MA) was applied to the rapidly solidified flakes by using a high energy ball mill with addition of stearic acid as a process control agent. Consolidation of flakes or MA powders was done by cold pressing, degassing and hot extrusion. A significant hardness increment was observed by MA treatment. After consolidation, P/M materials from MA powder showed very fine dispersoids and fine subgrain structures. Isochronal annealing experiments revealed microstructural stability was high at temperature up to 400°C. The MA treatment was significantly effective in improving the mechanical properties of rapidly solidified P/M Al-Fe alloys. Tensile strength of a P/M Al-8%Fe alloy increased to about 67kgf/mm2 at room temperature and to 27kgf/mm2 at 300°C. These improvements are attributed to the introduction of fine oxide/carbide dispersoids and fine subgrain structures formed during MA. However, decrease of ductility was accompanied in the mechanically alloyed P/M materials.
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