PURPOSE: To obtain an amorphous or fine crystalline high strength aluminum alloy having low specific gravity and high strength.
CONSTITUTION: This alloy has a composition where the content of Mm to be incorporated into Al is controlled to 0.5-4 atomic % and also Fe and Ti or Mn are incorporated so that they satisfy, by atom, 1≤Fe+Ti+Mn≤8 and 0.2≤(Ti+Mn)/(Fe+Ti+Mn)≤0.7. Further, this alloy has a structure of fine crystalline substances or a mixed structure of amorphous and fine crystalline substances. Because the amounts of the addition elements having relatively high specific gravities are limited and the content of Al by atomic percentage is increased, the specific gravity of the alloy can be reduced. Moreover, amorphous phases or fine crystalline phases are uniformly and properly dispersed in fine crystalline phases in a matrix and the fine crystalline phases in the matrix are subjected to solid solution strengthening by means of Mm and transition metals, such as Ti, Mn, and Fe, by which low specific gravity and high strength which cannot be provided by the conventional alloy can be obtained.
SATO KAZUAKI
SUGANUMA TETSUYA
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