| 摘要 |
PROBLEM TO BE SOLVED: To obtain an aluminum alloy having high strength and excellent in toughness by providing a structure which has anα-aluminum phase and phases of plural intermetallic compounds, having respectively specified average crystalline grain sizes, and also dispersing the crystalline grains of the intermetallic compounds so that they are connected intermittently. SOLUTION: The aluminum alloy, which has anα-aluminum phase consisting of crystalline grains of 60-1000nm average crystalline grain size and phases of two or more intermetallic compounds (Al-additive element), consisting of crystalline grains of 20-2000nm average crystalline grain size, and in which the crystalline grains of the intermetallic compounds are dispersed so that the connection among the crystalline grains of the intermetallic compounds becomes intermittent, is prepared. Moreover, the preffered composition of the aluminum alloy is represented by Ala Zrb Xc Zd , where X is Ti, V, Cr, etc., and Z is one or more elements among Y, La, Ce, etc., and the symbols (a) and (b) stand for 90-97 atomic % and 0.5-4 atomic %, resectively, and further, the symbols (c) and (d) are the values within the region of the shaded region enclosed with lines connecting point A (0, 1, 4), point B (0, 1, 1), point C (2, 5, 1), and point D (1, 5, 3) in the figure.
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