Formation and High Mechanical Strength of Al-Based Alloys Containing a Nanoscale Icosahedral Phase As a Main Constituent

概要

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This paper reviews our recent results on the achievement of high tensile strength and good ductility for rapidly solidified Al-Mn-Ln and Al-Cr-Ln (Ln=lanthanide metal) alloys containing an icosahedral phase as a main constituent phase. The good mechanical properties are attributed to the simultaneous achievement of the following three structural effects resulting from rapid solidification and appropriate alloy design; (1) the formation of a mixed structure consisting of nanoscale icosahedral particles surrounded by Al phase, (2) the formation of the icosahedral phase at low solute concentrations, (3) the achievement of an ultra-fine mixed state of icosahedral and approximant regions caused by the phason strain-induced approximant transition in the nanoscale icosahedral particles. The utilization of the structural effects is expected to cause high mechanical strengths combined with good ductility for other quasicrystalline alloys.
東北大学の論文
1993-03-29