Thermal stability, microstructure and mechanical properties of nanostructured Al-Ni-Mm-X (X = Cu and Fe) alloys hot-extruded from gas-atomized powders
Abbreviated Journal Title
rapid solidification; nano-crystalline materials; Al-Ni-Mm; high; strength; thermal stability; AMORPHOUS-ALLOYS; PARTICLES; BEHAVIOR; Materials Science, Multidisciplinary; Metallurgy & Metallurgical; Engineering
The effects of Cu and Fe additions on the thermal stability, microstructure and mechanical properties of Al-85-Ni-8.5-Mm(6.5), Al-94-Ni(8.5)Mm(6.5)Cu(1), Al-84-Ni-8.5-Mn16.5Fe1 alloys, manufactured by gas atomization, degassing and hot-extrusion were investigated. All hot-extruded alloys consisted of homogeneously-distributed fine-grained fcc-Al matrix and intermetallic compounds. A substitution of 1 at% Al by Cu increased the thermal stability of the amorphous phase and produced alloy microstructure with smaller fcc-Al grains. On ther other hand, the same substitution of 1 at% Al by Fe decreased the stability of the amorphous phase and produced larger fcc-Al grains. The formation of intermetallic compounds such as Al3Ni, Al11Ce3 and Al11La3 was suppressed by the addition of Cu or Fe. Among the three alloys examined, the highest Vickers hardness and compressive strength were obtained for Al-84-Ni-8.5-Mm(6.5)Cu(1) alloy, and related to the finest fcc-Al grain size attained from increased thermal stability with Cu addition.
"Thermal stability, microstructure and mechanical properties of nanostructured Al-Ni-Mm-X (X = Cu and Fe) alloys hot-extruded from gas-atomized powders" (2008). Faculty Bibliography 2000s. 544.