Development of Powder Metallurgy Aluminum Alloys with High Strength and High Elevated Temperature Strength

Abstract

We developed aluminum-based alloys consisting of amorphous, quasicrystalline, nano quasicrystalline plus fcc-Al, nano amorphous plus fcc-Al and glassy phases by a single-roller melt spinning method and a powder-metallurgy processing and examined their structure, thermal, electrical and mechanical properties. The high-pressure gas atomization technique was also used to prepare various aluminum-based alloy powders. Amorphous Al-M-Ni (M: Si, Ge) alloys have good bending ductility and glassy Al-Ln-Ni (Ln: Y, Ce) alloys exhibit a distinct supercooled liquid region. Besides, amorphous or glassy Al-Y-Ni-Co-Sc alloys have the highest strength reported ever before. We also found high strength alloys as Al-Cr-Ce-Co alloys with nano quasicrystalline particles dispersed in fcc-Al phase and Al-M-Fe (M: Ti, V) alloys with nano amorphous particles dispersed in fcc-Al phase. Further, by using the powder metallurgy method, we developed Al-V-Fe and Al-Fe-Cr-Ti alloy rods consisting of quasicrystalline particle dispersed in fcc-Al phase. These aluminum-based alloy rods show high strength, high elevated temperature strength and excellent abrasion resistance.