ALUMINUM ALLOY ALCLAD 2029 High Strength, High Toughness, Corrosion-Resistant Alclad Sheet / Plate DESCRIPTION APPLICATIONS AA 2029 was developed by Alcoa for use in aerospace and other applications benefiting from its superior combination of high yield strength, improved fracture toughness, and corrosion resistance. AA 2029 is targeted as a replacement for current and legacy fuselage alloys, such as AA2x24-T3. The combination of high yield strength and fracture toughness can be best utilized for primary metallic structures requiring high damage tolerance including fuselage and leading edge wing structures, but its usage is not limited to such applications. AA 2029 is available in the stress-relieved and artificially-aged T8 temper from 0.063 to 0.600 inches (1.60 to 15.24 mm) thick. Good corrosion resistance in bare 2029-T8 is further enhanced by the application of a commercially pure clad layer (1000-series) to anodically protect the core (substrate) in aggressive, corrosive environments. COMMERCIAL STATUS Alcoa Alclad 2029-T8 is covered by AMS 4272. Material design allowables approved by MMPDS are available. CHEMICAL COMPOSITION Chemical Composition Limits • AA 2029 (Wt.%)* Cu Mg Ag Mn Zr Si Fe Ti Al 3.2 - 4.0 0.8 - 1.1 0.30 - 0.50 0.20 - 0.40 0.08 - 0.15 0.12 max 0.15 max 0.10 max Bal. *Other elements: 0.05 wt. % max. (each); 0.15 wt. % max. (total) MECHANICAL PROPERTIES The following tables present the statistically-determined mechanical property minimums for Alclad 2029-T8 sheet and plate. The ultimate strength (Ftu) is similar to 2x24-T3 / T351 products. However, Alclad 2029-T8 offers upwards of 20% improvement in yield strength (Fty) when compared to 2524-T3. The plane stress fracture toughness is also greatly improved as demonstrated by the guaranteed minimum Kapp values from 16 inch-wide panels in the table and in the plots of typical Kapp vs. Fty and typical R-curves from 30 inch-wide panels. The fatigue crack growth resistance of Alclad 2029 is similar to that of Alclad 2524 and superior to that of Alclad 2024. Strength-Toughness Minima of Fuselage Alloys Plane Stress R-Curve 300 Dashed lines represent invalid data 2024-T3 2524-T3 2029-T8 90 T-L Orientation 80 70 30 M(T) Specimen, W=16 in., 2a/W=0.25 35 40 45 50 55 Yield Strength, Fty , ksi (S-basis) 60 0 Alc. 2024-T3 Alc. 2524-T3 Alc. 2029-T3 Bare 2029-T8 T-L Orientation M(T) Specimen, W=30 in., 2a/W=0.33 0 Alc. 2024-T3 Alc. 2524-T3 Alc. 2029-T8 da/dN (in./cycle) 100 FCG Curves 1.0E-02 in) 110 KR (ksi T-L Kapp, Typical (ksi in) 120 6 aeff (in.) CONTACT AND PROCUREMENT For additional information on Alclad 2029, contact your local Alcoa Sales Account Manager. 1.0E-06 M(T) Specimen, W=15.75 in., R=0.1, Lab Air 1 10 K (ksi in) 100 Static Properties • Alclad 2029-T8 and Alclad 2524-T3 Sheet / Plate • MMPDS Minimum Values (A- or S-Basis) Direction Property Alclad 2029-T8 (AMS 4272) Alclad 2524-T3 (AMS 4296) Thickness, in 0.0630.164 0.1650.249 0.2500.499 0.5000.600 0.0630.128 0.1290.249 0.2500.310 (mm) (1.604.17) (4.196.32) (6.3512.67) (12.7015.24) (1.603.25) (3.286.32) (6.357.87) Tensile Strength, Ftu (A), ksi (MPa) L 61 (421) 61 (421) 61 (421) 61 (421) 61 (421) 62 (427) 62 (427) LT 61 (421) 61 (421) 61 (421) 61 (421) 61 (421) 62 (427) 62 (427) Yield Strength, Fty (A), ksi (MPa) L 55 (379) 55 (379) 56 (386) 56 (386) 45 (310) 45 (310) 45 (310) LT 54 (372) 54 (372) 54 (372) 54 (372) 40 (278) 40 (278) 40 (278) L 8 10 11 13 – – – LT 9 10 10 11 15 15 15 % El. (S) (4D) Tension Modulus, E, 103 ksi: Primary / Secondary L, LT (GPa) L 10.3 (71.0) / 9.8 (67.6) 10.3 (71.0) / 9.8 (67.6) 0.100 (2.77) 0.100 (2.77) Density, ρ, lbs/ in3 (g/cm3) Plane Stress Fracture Toughness • Alclad 2029 Sheet / Plate • Minimum Values • 16-inch (406 mm) Wide Panel Thickness Inch (mm) Alclad 2029-T8 (AMS 4272) Kapp, ksi√in (MPa√m) T-L Orientation 0.063-0.499 (1.60-12.67) 95 (104) 0.500-0.600 (12.70-15.24) 95 (104) CORROSION RESISTANCE Alclad 2029-T8 is resistant to exfoliation corrosion and is superior to legacy 2x24-T3 fuselage products. SCC resistance has been demonstrated in both laboratory and seacoast test environments at moderate to high stress in the ST orientation. With the cladding removed, bare substrate results have exhibited pitting and light intergranular (IG) attack at the onset of corrosion. ALCOA AEROSPACE AND AUTOMOTIVE PRODUCTS P.O. BOX 8025 • BETTENDORF, IOWA 52722 • 1-800-523-9596 • www.alcoa.com Product specifications are subject to change without notice. ©2016 Alcoa Inc. 2/16