ALUMINUM ALLOY 7065
High Strength, High Toughness, Corrosion-Resistant Plate
DESCRIPTION
APPLICATIONS
Alcoa developed aluminum alloy AA 7065 to provide higher
strength and similar or improved fracture toughness relative
to legacy 7000-Series alloys at intermediate product thicknesses of 1.0 to 6.0 inches (25.4 to 152.4 mm).
The combination of high strength and fracture toughness
properties and corrosion resistance makes 7065 suitable as
a replacement for 7010, 7050, 7075, 7475 and other alloys
for critical intermediate thickness applications. These include
but are not limited to spar, rib, and integrally machined
structural parts for new, derivative, or retrofit aircraft.
Alloy 7065 plate is available in T7451 and T7651 tempers.
The corrosion resistance (exfoliation and stress corrosion
cracking resistance) of 7065 is comparable to that of legacy
7000-Series for a given temper, as demonstrated in both
accelerated and seacoast environments.
COMMERCIAL STATUS
Alcoa alloy 7065 plate is covered by AMS 4351 (T7651
temper) and AMS 4361 (T7451 temper). Material design
allowables approved by MMPDS are available.
CHEMICAL COMPOSITION Chemical Composition Limits • AA 7065 (Wt.%)*
Zn
Cu
Mg
Zr
Mn
Cr
Ti
Fe
Si
Al
7.1-8.3
1.9-2.3
1.5-1.8
0.05-0.15
0.04 max
0.04 max
0.06 max
0.08 max
0.06 max
Remainder
*Other elements: 0.05 wt.% max (each); 0.15 wt.% max (total)
MECHANICAL PROPERTIES
The following tables and figures provide mechanical properties for 7065 in the T7651 and T7451, and compare 7065
properties with 7050. Alloy 7065 plate offers superior strength properties with similar or improved fracture toughness
and fatigue crack growth resistance. The minimum guaranteed S-N fatigue performance (Kt=1, LT direction) for both
tempers is the same as that for 7050-T7451 (AMS 4050).
28
7050-T7451
AMS 4050
26
20
18
4-5"
1-2"
2-3"
0.25-2"
5-6"
7065-T7651
AMS 4351
1.5-2"
2-3"
24
22
1-1.5"
3-4"
3-4"
4-5"
5-6"
2-3"
3-4"
4-5"
1.E-02
1.E-03
1.E-04
1.E-05
60
62
64
66
68
70
72
74
76
Tensile Yield Strength (A-basis), LT Direction, (ksi)
1.E-07
7065-T7651, 12 lots, 2 - 6 in.
10
K (ksi in)
100
Spec. Minimum, 3 - 6 in.
R
Runout
50
40
30
RH > 90%, Freq.= 25 Hz
1
7065-T7451, 12 lots, 2 - 6 in.
60
1.E-06
5-6"
7065, Smooth (Kt=1) Axial Fatigue, R=0.1
70
7065-T7451, 3 in., T/2
7065-T7451, 5 in., T/4
7065-T7451, 6 in., T/4
7065-T7651, 2 in., T/2
7065-T7651, 3 in., T/2
7065-T7651, 5 in., T/4
7065-T7651, 6 in., T/4
7050-T7651, 4 in., T/4
Maximum Stress, ksi
7065-T7451
AMS 4361
32
30
7065 Fatigue Crack Growth, L-T Orient., R=0.1
Strength-Toughness Minima for 7065 Plate
da/dN (in/cycle)
KIc (S-basis), T-L, (ksi in)
34
7065-T7451
AMS 4361
!"#$%&!'$()*+,)'-#()
7065-T7651 AMS 4351
!"#$%&!#$()*+,)'-$()
7050-T7451
AMS 4050
!"$"%&!'$()*+,)'"$")
20
1.E+04
CONTACT AND PROCUREMENT
For additional information on 7065 plate, contact your local Alcoa Sales Account Manager.
1.E+05
xx27
x3
x
LT Direcon, T/2 Plane
Lab Air (RH~35%), Freq.= 20-30 Hz
1.E+06
Cycles, N
1.E+07
Static Properties • 7065 Plate • Minimum Values (S- or A-Basis)
Thickness
Inch (mm)
1.000-1.500
(25.40-38.10)
1.501-2.000
(38.12-50.80)
2.001-3.000
(50.82-76.20)
3.001-4.000
(76.22-101.60)
4.001-5.000
(101.62-127.00)
5.001-6.000
(127.02-152.40)
7065-T7651 (AMS 4351)
Dir.
Fty (A)
ksi (MPa)
7065-T7451 (AMS 4361)
Ftu (A)
ksi (MPa)
% El. (S)
(4D)
Fty (A)
ksi (MPa)
Ftu (A)
ksi (MPa)
% El. (S)
(4D)
L
76 (524)
80 (552)
10
71 (490)
77 (531)
11
LT
73 (503)
80 (552)
9
70 (483)
77 (531)
10
L
75 (517)
79 (545)
10
70 (483)
76 (524)
11
LT
73 (503)
80 (552)
9
69 (476)
77 (531)
9
ST
68 (469)
78 (538)
6
64 (441)
75 (517)
6
L
74 (510)
78 (538)
9
70 (483)
76 (524)
10
LT
72 (496)
79 (545)
8
68 (469)
76 (524)
8
ST
68 (469)
77 (531)
4
64 (441)
74 (510)
5
L
74 (510)
78 (538)
9
69 (476)
75 (517)
9
LT
71 (490)
78 (538)
6
68 (469)
75 (517)
7
ST
67 (462)
77 (531)
3
63 (434)
73 (503)
4
L
74 (510)
77 (531)
8
69 (476)
75 (517)
9
LT
71 (490)
78 (538)
5
68 (469)
75 (517)
6
ST
67 (462)
76 (524)
3
63 (434)
73 (503)
3
L
74 (510)
76 (524)
7
69 (476)
74 (510)
8
LT
71 (490)
77 (531)
5
67 (462))
75 (517)
5
ST
67 (462)
75 (517)
3
63 (434)
73 (503)
3
Fracture Toughness • 7065 Plate • Minimum Values (S-Basis)
Thickness
Inch (mm)
7065-T7651 (AMS 4351)
7065-T7451 (AMS 4361)
KIc, ksi√in (MPa√m)
KIc, ksi√in (MPa√m)
L-T
T-L
1.000-1.500 (25.40-38.10)
35 (38)
1.501-2.000 (38.12-50.80)
32 (35)
S-L
L-T
T-L
27 (30)
39 (43)
30 (33)
27 (30)
36 (40)
29 (32)
S-L
2.001-3.000 (50.82-76.20)
29 (32)
25 (27)
23 (25)
32 (35)
27 (30)
25 (27)
3.001-4.000 (76.22-101.60)
25 (27)
23 (25)
22 (24)
28 (32)
24 (26)
23 (25)
4.001-5.000 (101.62-127.00)
24 (26)
21 (23)
21 (23)
26 (29)
22 (24)
21 (23)
5.001-6.000 (127.02-152.40)
23 (25)
20 (22)
20 (22)
25 (27)
21 (23)
21 (23)
CORROSION RESISTANCE
The exfoliation corrosion and SCC resistance of 7065 in the T7651 and T7451 tempers is the same as 7050 in the equivalent
temper, and superior to 7xxx alloys in T6 tempers. The minimum guaranteed EXCO (ASTM G34) is EB for both tempers. The
minimum guaranteed SCC resistance (ASTM G47) in the ST direction is 25 ksi (172 MPa) for the T7651 temper, and 35 ksi
(241 MPa) for the T7451 temper. The good corrosion resistance of 7065 has been demonstrated in both accelerated and
seacoast environments.
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.
©2015 Alcoa Inc.
10/15