Aluminum alloy 7085
High strength, high toughness, corrosion-resistant thick plate
Description
Applications
Arconic developed aluminum alloy AA 7085 to provide
The combination of high strength and fracture toughness
combinations of higher strength and fracture toughness than
properties and corrosion resistance in thick sections makes
legacy 7000-Series in thick sections. 7085 is based on a unique
7085 suitable as a replacement for 7050 and other thick product
composition optimized to provide low quench sensitivity.
alloys for critical thick product applications included but not
limited to spar, rib, and integrally machined structural parts for
Alloy 7085 plate is available in the T7451 temper from 3.0 to 7.0
new, derivative, or retrofit aircraft.
inches (76.2 to 177.8 mm) thick and in the T7651 temper from
4.0 to 7.0 inches (101.6 to 177.8 mm) thick. The T7651 temper
Commercial status
provides higher strength and the T7451 temper better corrosion
Arconic alloy 7085 plate is covered by AMS 4329 (T7651 temper)
resistance as measured in both accelerated saline and seacoast
and AMS 4470 (T7451 temper). Material design allowables are
environments.
available in MMPDS.
Chemical composition Chemical Composition Limits • AA 7085 (Wt.%)*
Zn
Cu
Mg
Zr
Mn
Cr
Ti
Si
Fe
Al
7.0-8.0
1.3-2.0
1.2-1.8
0.08-0.15
0.04 max
0.04 max
0.06 max
0.06 max
0.08 max
Remainder
*Other elements: 0.05 wt.% max (each); 0.15 wt.% max (total)
Mechanical properties
tempers, and compare 7085
properties with 7050. Alloy 7085
plate offers superior strength and
fracture toughness with similar
34
32
30
28
7050-T7451
AMS 4050
26
24
5-6"
22
5-6"
20
fatigue and fatigue crack growth
55
57
59
7085-T7451
AMS 4470
4-5"
6-7"
5-6"
63
4-5"
5-6"
6-7"
4-5"
4-5"
5-6"
65
1.E-04
1.E-05
1.E-06
RH > 90%, Freq.= 25 Hz
T/4 Plane
5-6"
6-7"
4-5"
7085-T7651
AMS 4329
3-4"
3-4"
4-5"
3-4"
61
7085-T7451, 4 in.
7085-T7451, 6 in.
7085-T7651, 4 in.
7050-T7451, 4 in.
7050-T7451, 6 in.
7050-T7651, 4 in.
1.E-03
da/dN (in/cycle)
for 7085 in the T7651 and T7451
7085-T7651 (L)
7085-T7651 (LT)
7085-T7451 (L)
7085-T7451 (LT)
7050-T7451 (L)
7050-T7451 (LT)
36
7085 Fatigue Crack Growth, T-L Orient., R=0.1
1.E-02
3-4"
6-7"
67
69
1.E-07
71
73
75
1
10
K (ksi in)
L or LT Tensile Yield Strength (A-basis,ksi)
resistance.
7085-T7451, Smooth (Kt=1) Axial Fatigue, R=0.1
Maximum Stress, ksi
70
Lab Air (RH 33-42%), Freq.= 30 Hz
LT Orient., T/2 Plane
60
Runout
50
x4
40
x10 x3
7050-T7451 AMS 4050
30
1.E+04
1.E+05
1.E+06
100
7085-T7651, Open Hole (Kt=2.3), R=0.1
50
7085-T7451, 6 lots, 4-7 in.
Maximum Net Stress, ksi
provide mechanical properties
L-T or T-L K Ic (S-basis, ksi in)
The following tables and figures
Strength - Toughness Minima for 7085 Plate
38
1.E+07
Cycles, N
Contact and procurement
For additional information on 7085 plate, contact your local Arconic Sales Account Manager.
7085-T7651, 4 - 6 in. Plate, 6 lots
Runout
40
30
x5
20
High Humidity (RH>90%), Freq.= 25 Hz
L-T Orient., T/2 Plane
10
1.E+04
1.E+05
1.E+06
Cycles, N
1.E+07
Static Properties • 7085 Plate • Minimum Values (S- or A-Basis)
Thickness
Inch (mm)
7085-T7651 (AMS 4329)
Direction
3.000-4.000
(76.20-101.60)
4.001-5.000
(101.62-127.00)
5.001-6.000
(127.02-152.40)
6.001-7.000
(152.42-177.80)
Fty (A)
ksi (MPa)
Ftu (A)
ksi (MPa)
7085-T7451 (AMS 4470)
% El. (S)
(4D)
Fty (A)
ksi (MPa)
Ftu (A)
ksi (MPa)
% El. (S)
(4D)
L
68 (469)
73 (503)
11
LT
66 (455)
73 (503)
8
ST
61 (421)
72 (496)
4
L
72 (496)
75 (517)
9
68 (469)
73 (503)
10
LT
69 (476)
76 (524)
7
66 (455)
73 (503)
7
ST
65 (448)
74 (510)
3
61 (421)
71 (490)
4
L
72 (496)
75 (517)
8
68 (469)
72 (496)
9
LT
69 (476)
76 (524)
7
65 (448)
73 (503)
6
ST
65 (448)
73 (503)
3
61 (421)
70 (483)
4
L
71 (490)
74 (510)
8
67 (462)
72 (496)
8
LT
67 (462)
75 (517)
5
64 (441)
72 (496)
5
ST
64 (441)
72 (496)
3
60 (414)
69 (476)
4
Fracture Toughness • 7085 Plate • Minimum Values (S-Basis)
Thickness
Inch (mm)
7085-T7651 (AMS 4329)
7085-T7451 (AMS 4470)
KIc, ksi√in (MPa√m)
KIc, ksi√in (MPa√m)
L-T
T-L
S-L
3.000-4.000 (76.20-101.60)
L-T
T-L
S-L
36 (40)
27 (30)
27 (30)
4.001-5.000 (101.62-127.00)
29 (32)
24 (26)
24 (26)
32 (35)
25 (27)
26 (29)
5.001-6.000 (127.02-152.40)
27 (30)
22 (24)
23 (25)
29 (32)
23 (25)
24 (26)
6.001-7.000 (152.42-177.80)
26 (29)
21 (23)
22 (24)
29 (32)
22 (24)
23 (25)
Corrosion resistance
The minimum guaranteed exfoliation resistance (EXCO ASTM G34) for 7085 is EB for both the T7651 and T7451 tempers.
The minimum guaranteed SCC resistance (ASTM G47) in the ST direction is 26 ksi (180 MPa) for the T7651 temper,
and 35 ksi (241 MPa) for the T7451 temper.
Arconic Aerospace and Automotive Products
P.O. Box 8025 • Bettendorf, Iowa 52722 • 1-800-523-9596 • www.arconic.com
Product specifications are subject to change without notice.
©2016 Arconic Inc.
12/16