PURPOSE: To obtain a high strength Al-base alloy excellent in mechanical properties by preparing an Al alloy containing specific percentages of Mn, Co, rare earth elements, etc., and having quasi-crystals in a structure.
CONSTITUTION: A molten alloy having a composition represented by the formula AlbalQaMbXc [where Q is Mn and/or Cr, M is one or more elements among Co, Ni, and Cu, X is one or more rare earth elements including Y or misch metal, and the symbols (a), (b), (c) stand for, by atom, 1-7%, 0.5-5%, and >0-5%, respectively, and, preferably, 3%≤(a+b+c)≤7% is satisfied] is formed into foil by means of liquid quenching equipment by chill block melt spinning, by which an aluminum-base alloy containing 20-70vol.% quasi-crystals in a structure is prepared. Further, the quasi-crystals are of icosahedron phase or regular decagonal phase or crystal phase approximating to the above phases, and further, preferred average particle size and about 10-1000nm. By this method, the aluminum-base alloy excellent in heat resistance and hardness and strength at room temp. and high temp. and having high specific strength can be obtained.
INOUE AKIHISA
NAGAHORA JIYUNICHI
SHIBATA TOSHISUKE
KITA KAZUHIKO
INOE AKIHISA
YOSHIDA KOGYO KK
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