Metal treatment – Stock – Age or precipitation hardened or strengthened
Patent
1998-04-07
2000-04-11
Ip, Sikyin
Metal treatment
Stock
Age or precipitation hardened or strengthened
148418, 148419, 148693, C22C 2106
Patent
active
060484152
ABSTRACT:
A heat treatable 7000 series aluminum alloy has a micro-structure with a crystal grain size of 45 .mu.m or less and an aspect ratio (longitudinal/long transverse ratio of crystal grain) of preferably 4 or less, whereby its corrosion resistance is improved outstandingly by applying a solution heat treatment and hardening and subsequently, applying an aging treatment at 100 to 145.degree. C. for 5 to 50 hr, a reversion treatment at 140 to 195.degree. C. for 0.5 to 30 hr. and a re-aging treatment at 100 to 145.degree. C. for 5 to 50 hr. to thereby make an electroconductivity to 38-40 IACS %, and render the micro-structure so as to have a minimum distance for the .eta. phase on the crystal grain boundary of 20 nm or more and a maximum size for the .eta.' phase in the crystal grain of 20 nm or less.
REFERENCES:
patent: 3856584 (1974-12-01), Cina
patent: 5221377 (1993-06-01), Hunt et al.
patent: 5759302 (1998-06-01), Nakai et al.
Di Russo, E.; Signoretti, S., Improvement of the Properties of High Strength Aluminum-Zinc-Magnesium-Copper Alloys by Thermomechanical Procedures, Agard Reg. (1973), Agard-R-610, 55-76.
Eto Takehiko
Nakai Manabu
Ip Sikyin
Kabushiki Kaisha Kobe Seiko Sho
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