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Effects of supercooling and cooling rate on the solidified structures of Al-Mn, Al-Cr and AI-Zr alloys, which had a strong tendency to form metastable solid solution by rapid cooling of the molten alloys, were investigated by means of thermal analysis and microscopic observation. The results obtained were as follows:(1) The square of the degree of supercooling was proportional to the cooling rate on the solidification of the alloys having a solute concentration up to the maximum solid solubility limit at equilibrium (Ce). At solute concentrations higher than Ce, this relation was satisfied under the conditions that the primary crystals were a super-saturated solid solution.(2) The minimum cooling rate to form the super-saturated solid solutions containing more solute atoms than Cc was 115, (3) Metastable phase diagrams were proposed under varying conditions of composition, temperature and cooling rate in the Al-Mn, Al-Gr and Al-Zr systems.

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