DEVELOPMENT OF Al-Re P/M ALLOY BY ATOMIZATION-ROLLING PROCESS.

Ultra-rapid solidification is required instead of gas atomization in order to modify the properties of P/M alloys, especially dispersion-strengthened Al-Fe alloys. In the present work, various Al-Fe alloys were rapidly solidified by means of atomization-rolling and consolidated by hot extrusion. Microstructure and tensile properties were evaluated in comparison with gas atomization. The cooling rate of atomization-rolling was 10**5-10**7 degree C/sec which was higher than gas atomization. Extruded alloys had higher strength at room and elevated temperature due to finer dispersion of intermetallic compounds. Al-8 percent Fe-2 percent V-2 percent Mo-1 percent Zr alloy had high strength at elevated temperature.