Dispersoids 7XXX alloy products with enhanced environmentally assisted cracking and fatigue crack growth deviation resistance

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United States of America

PATENT NO 12221677
APP PUB NO 20230114162A1
SERIAL NO

17933633

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Abstract

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Dispersoids 7xxx aluminum alloy products with enhanced fatigue crack growth deviation and Environmentally Assisted Cracking (EAC) resistance are disclosed. The 7xxx aluminum alloy comprises 1 to 3 wt. % Cu, 1.2 to 3 wt. % Mg, 4 to 8.5 wt. % Zn, up to 0.3 wt. % Mn, up to 0.15 wt. % Zr, up to 0.3 wt. % Cr dispersoid elements, incidental elements, and the balance Al. In one embodiment, the alloy includes Zr+Cr+Mn in the range of 0.2 to 0.8 wt. %. In another embodiment, the alloy includes Zr+Mn in the range of 0.07 to 0.7 wt. %. This alloy can be fabricated to plate, extrusion, or forging products, and is especially suitable for aerospace structural components. The products have enhanced EAC resistance and fatigue crack growth deviation resistance. Meanwhile, the products have an excellent combination of strength, fracture toughness, ductility at different orientations, and Stress Crack Corrosion (SCC), and exfoliation corrosion resistance suitable for aerospace application.

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Patent Owner(s)

  • KAISER ALUMINUM FABRICATED PRODUCTS, LLC

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Gomiero, Philippe Spokane Valley, US 3 33
Long, Zhengdong Spokane, US 8 6
Matuska, Robert A Heath, US 13 7
McDaniel, Garry R Newark, US 1 0
Rastogi, Ravi Liberty Lake, US 30 286
Scheuring, Jason N Spokane, US 2 1

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