Heat treatable Al alloys excellent in fracture touchness, fatigu

Metal treatment – Stock – Age or precipitation hardened or strengthened

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148416, 148417, 420533, 420541, 420542, 420543, C22C 2110, C22C 2112

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active

057593027

ABSTRACT:
There is provided Al alloys which have improved and excellent fracture toughness and fatigue characteristic and improved formability, and which can be suitably used for transportation machines, such as aircraft, railway vehicles, general mechanical parts and the like. The Al alloy contains 1 to 8% (% by weight, the same is true for the following) of Cu, containing one or more selected from a group comprising 0.4 to 0.8% of Mn, 0.15 to 0.3% of Cr, 0.05 to 0.1% of Zr and 0.1 to 2.5% of Mg, Fe and Si each being less than 0.1%, a distance between constituents being more than 85 .mu.m, and having a micro-structure fulfilling at least one of the following (a) to (c):

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