Method for manufacturing 7000-series aluminum alloy member
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United States of America Patent
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Nov 29, 2022
Grant Date -
Mar 18, 2021
app pub date -
Jul 10, 2020
filing date -
Jul 11, 2019
priority date (Note) -
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Abstract
When a T1-tempered aluminum alloy extrusion is subjected to plastic working and thus formed into a product, crack occurrence is prevented during plastic working, and tensile residual stress of the product is reduced to improve stress corrosion cracking resistance. A T1-tempered 7000-series aluminum alloy extrusion is heated to a temperature range of 150° C. or higher, and then subjected to plastic working within the temperature range, and then cooled, and then subjected to artificial temper aging. An integral value (F140) of (T(t)−140)2 is controlled to 5×105 (° C.2·s) or less in a section of t1≤t≤t2, where t is time (s) from heating start, T(t) is temperature (° C.) of the extrusion at time t, t1 is time before the extrusion reaches 140° C. in a heating step, and t2 is time before the extrusion reaches 140° C. again in a cooling step.
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