Alcoa 7055-T77511 Aluminum Extrusions

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Alcoa 7055-T77511 Aluminum Extrusions
Categories:	Metal; Nonferrous Metal; Aluminum Alloy; 7000 Series Aluminum Alloy
Material Notes:	Alcoa introduced alloy 7055 in the -T7751 temper for plate and the -T77511 for extrusions in 1991. This alloy was developed for use in compression-dominated structures (such as upper wing structures, horizontal stabilizer, and keel beams) and provides advantages over alloy 7150 in compressive and tensile strengths while maintaining other important properties such as fracture toughness and corrosion resistance. Information provided by Alcoa.
Key Words:	Aluminium 7055-T77511; AA7055
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Physical Properties	Original Value	Comments

Density	2.86 g/cc

Mechanical Properties	Original Value	Comments
Tensile Strength, Ultimate	92000 psi @Thickness 25.4 mm	Longitudinal Direction
	93000 psi @Thickness 25.4 mm	LT Direction
Tensile Strength, Yield	89000 psi @Thickness 25.4 mm	Longitudinal Direction
	89000 psi @Thickness 25.4 mm	LT Direction
Elongation at Break	10 % @Thickness 25.4 mm	LT Direction
	11 % @Thickness 25.4 mm	Longitudinal Direction
Compressive Yield Strength	90000 psi @Thickness 25.4 mm	Longitudinal Direction
	94000 psi @Thickness 25.4 mm	LT Direction
Fracture Toughness	24.0 ksi-in½ @Thickness 25.4 mm	K_IC, T-L
	26.0 ksi-in½ @Thickness 25.4 mm	K_IC, L-T

Component Elements Properties	Original Value	Comments
Aluminum, Al	85.9 - 88.5 %	As remainder
Chromium, Cr	<= 0.04 %
Copper, Cu	2.0 - 2.6 %
Iron, Fe	<= 0.15 %
Magnesium, Mg	1.8 - 2.3 %
Manganese, Mn	<= 0.05 %
Other, each	<= 0.05 %
Other, total	<= 0.15 %
Silicon, Si	<= 0.10 %
Titanium, Ti	<= 0.06 %
Zinc, Zn	7.6 - 8.4 %
Zirconium, Zr	0.08 - 0.25 %

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NALCOA98 / 176072

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