Abstract
This paper aims to review our recent results on the microstructure and mechanical properties of rapidly solidified Al-based alloys. The formation of non-periodic structures such as amorphous or icosahedral (I) phase by rapid solidification was found to cause the achievement of high tensile strength ( σf ) exceeding 1200 MPa combined with good bending ductility. The highest σf was 1260 MPa in an amorphous phase, 1560 MPa in coexistent amorphous and nanoscale Al phases and 1340 MPa in coexistent I and Al phases. The extrusion of atomized powders having the amorphous or I+A1 structure at appropriate temperatures caused the formation of bulky alloys with finely mixed structures consisting of Al+compound or Al+I+compound, respectively. The former mixed phase alloys exhibit high σf of 800 to 1000 MPa and elongation ( ep) of 1 to 7%, while the latter mixed phase alloys have high σf of 500 to 600 MPa combined with large ep of 15 to 25 %. These good mechanical properties allow us to expect that new type of high-strength and high-ductility alloys are produced as practical materials by utilizing the feature of the non-periodic structure.
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