====== Alloy 7050 ======
Chemical Composition Limits Others
Weight % Si Fe Cu Mn Mg Cr Zn Ti Zr Each Total
Minimum - - 2.0 - 1.9 - 5.7 - 0.08 - -
Maximum 0.12 0.15 2.6 0.10 2.6 0.04 6.7 0.06 0.15 0.05 0.15

Typical Physical Properties
Characteristic English Metric
Nominal Density (68 °F/20 °C) 0.102 lbs./in.3 2.83 Mg/m3
Melting Range 870 °F - 1175 °F 524 °C - 635 °C
Specific Heat (212 °F/100 °C) 0.21 BTU/lb. - °F 860 J/kg - °K
Coefficient of Thermal Expansion
Linear
68 °F-212 °F
20 °C-100 °C
13.1 micro in./in.-°F 23.5 micro m/m -°K
Volumetric
68 °F/20 °C
3.78 x 10-5in.3/in.3 -°F 68 x 10-6m3/m3 -°K
Thermal Conductivity (68°F/20°C) T76,T76511 89 BTU/ft. - hr. - °F 154 W/m - °K
T3, T7351,T74, T74511 91 BTU/ft. - hr. - °F 157 W/m - °K
Electrical Conductivity (68°F/20°C) Equal Volume T76,T76511 39.5% IACS
T74, T74511 40.5% IACS

Typical Mechanical Properties (Longitudinal)
  Tensile (.500" Dia. Specimen) Hardness Shear Fatigue1 Modulus
Temper Yield Ultimate Elongation/4D
Brinell
500 kg
10 mm
Ultimate Shearing Strength Endurance Limit - R.R. Moore Type Modulus of Elasticity
KSI MPa KSI MPa %   KSI MPa KSI MPa KSI x 103 Gpa
T76, T76511 71 489 80 552 11 150 47 324 - - 10.2 70.3
T74, T74511 68 469 76 524 11 140 44 303 - - 10.2 70.3

1 5 x 10E7 cycles, axially loaded specimens tested at R = 0.1
Comparative Characteristics
Temper Corrosion Resistance
Cold
Workability3
Machin-
ability3
Anodize
Response3
Braze-
ability4
Weldability4
General1 Stress2 Gas Arc Spot
T76, T76511 C B D B B D D D B
T74, T74511 C B D B B D D D B
1 Ratings A through E are relative ratings in decreasing order of merit, based on exposures to sodium chloride solution by intermittent spraying or immersion. Alloys with A and B ratings can be used in industrial and seacoast atmospheres without protection. Alloys with C, D and E ratings generally should be protected at least on faying surfaces.
2 Stress-corrosion cracking ratings are based on service experience and laboratory tests of specimens exposed to the 3.5% sodium chloride alternate immersion test.
A= No known instance of failure in service or in laboratory tests.
B= No known instance of failure in service; limited failures in laboratory tests of short transverse specimens.
C= Service failures with sustained tension stress acting in short transverse direction relative to grain structure; limited failures in laboratory tests of long transverse specimens.
D= Limited service failures with sustained longitudinal or long transverse

3 Ratings A through D for Workability (cold), A through E for Machinability and A through C for Anodize Response, are relative ratings in decreasing order of merit.
4 Ratings A through D for Weldability and Brazeability are relative ratings defined as follows:
A= Generally weldable by all commercial procedures and methods.
B= Weldable with special techniques or for specific applications that justify preliminary trails or testing to develop welding procedure and weld performance.
C= Limited weldability because of crack sensitivity or loss in resistance to corrosion and mechanical properties.
D= No commonly used welding methods have been developed.
Applicable Specifications
Extruded
AMS 4340
AMS 4341
AMS 4342

Alloy Description
This alloy is used in aircraft structural parts. The alloy has characteristics of high strength coupled with good resistance to exfoliation and stress corrosion cracking. The alloy also has good fracture toughness and fatigue resistance.