7xxx series aluminum alloy member excellent in stress corrosion cracking resistance and method for manufacturing the same

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United States of America Patent

PATENT NO 10138537
APP PUB NO 20140209223A1
SERIAL NO

14132381

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Abstract

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An aluminum alloy member resistant to cracking and having high strengths and excellent stress corrosion cracking resistance is manufactured by crushing a 7xxx aluminum alloy extrudate. Specifically, a 7xxx aluminum alloy extrudate containing Zn of 3.0-8.0%, Mg of 0.4-2.5%, Cu of 0.05-2.0%, and Ti of 0.005-0.2%, in mass percent, and prepared through press quenching is subjected to a reversion treatment, to crushing within 72 hours after the reversion treatment, and then to aging. The reversion treatment includes heating at a temperature use rate of 0.4° C./second or more, holding in a temperature range of 200-550° C. for longer than 0 second, and cooling at a rate of 0.5° C./second or more. The ratio of the tensile residual stress σrs to the 0.2% yield stress σ0.2 after aging and the total content X of Mg and Zn satisfy a condition specified by Expression (1):

description='In-line Formulae' end='lead'Y≤−0.1X+1.4  (1).description='In-line Formulae' end='tail'

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Patent Owner(s)

  • KOBE STEEL, LTD.

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hashimoto, Narikazu Shimonoseki, JP 20 128
Shikama, Takahiro Shimonoseki, JP 15 52
Tsuyoshi, Tsunetake Shimonoseki, JP 13 79

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