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Aging Aluminum Alloy 7085 Mold Blocks Part 1: Two-Step Aging

Aging Aluminum Alloy 7085 Mold Blocks Part 1: Two-Step Aging
J.T. Staley; Sr.; H. Conrad; W. Crill; J. Grossman; and F. Skaria

Aerospace quality 7085 forgings are aged by a multi-step 72 hour aging practice. This treatment was deemed to be too expensive for forged block used for polymer molds, so Alcoa's Cleveland Works asked that we develop a shorter aging treatment. We first determined Tv (GP zones nucleate below this temperature regardless of vacancy content) and Tc (GP zones are unable to nucleate above this temperature). Using these data, we selected a pre-aging temperature of 260 F and explored effects of time at this temperature prior to aging at 320 F, 5°F above the nominal aging temperature of 315 F. We found that 3 hours at 260 F provided a size distribution of GP zones that was stable at this temperature. Alcoa had determined previously that 17 hours at 315 F provided the strength and corrosion characteristics required. We recommended that they precede this treatment by a pre-age of 3 hours at 260 F.

Publisher: TMS
Product Format: PDF
Pages: 137-142
Date Published: June 1, 2007
Discounted member price: 10.00
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