7075 aluminium alloy

 

Aluminium alloy 7075 is an aluminium alloy, with zinc as the primary alloying element. It is strong, with a strength comparable to many steels, and has good fatigue strength and average machinability, but has less resistance to corrosion than many other Al alloys. Its relatively high cost limits its use to applications where cheaper alloys are not suitable.

7075 aluminum alloy's composition roughly includes 5.6–6.1% zinc, 2.1–2.5% magnesium, 1.2–1.6% copper, and less than half a percent of silicon, iron, manganese, titanium, chromium, and other metals. It is produced in manytempers, some of which are 7075-07075-T67075-T651.

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Basic properties

Aluminium 7075A has a density of 2.810 g/cm³ (0.1015 lb/in³).

Mechanical properties

The mechanical properties of 7075 depend greatly on the temper of the material.

7075-0

Un-heat-treated 7075 (7075-0 temper) has maximum tensile strength no more than 40,000 psi (275 MPa), and maximum yield strength no more than 21,000 psi (145 MPa). The material has an elongation (stretch before ultimate failure) of 9–10%. It is very highly corrosive and good strength

7075-T6

T6 temper 7075 has an ultimate tensile strength of 74,000–78,000 psi (510–572 MPa) and yield strength of at least 63,000–69,000 psi (434–503 MPa). It has a failure elongation of 5–11%.

The T6 temper is usually achieved by homogenizing the cast 7075 at 450C for several hours, quenching, and then aging at 120C for 24 hours. This yields the peak strength of the 7075 alloy. The strength is derived mainly from finely dispersed eta and eta' precipitates both within grains and along grain boundaries.

7075-T651

T651 temper 7075 has an ultimate tensile strength of at least 67,000–78,000 psi (462–538 MPa) and yield strength of 54,000–67,000 psi (372–462 MPa). It has a failure elongation of 3–9%.

The 51 suffix has no bearing on the heat treatment but denotes that the material is stress relieved by controlled stretching.

7075-T7

T7 temper has an ultimate tensile strength of 73,200 psi (505 MPa) and a yield strength of 63,100 psi (435 MPa). It has a failure elongation of 13%. T7 temper is achieved by overageing (meaning ageing past the peak hardness) the material. This is often accomplished by ageing at 100C-120C for several hours and then at 160C-180C for 24 hours or more. The T7 temper produces a micro-structure of mostly eta precipitates. In contrast to the T6 temper, these eta particles are much larger and prefer growth along the grain boundaries. This reduces the susceptibility to stress corrosion cracking. T7 temper is equivalent to T73 temper.

7075-RRA

The retrogression and reage (RRA) temper is a multistage heat treatment temper. Starting with a sheet in the T6 temper, it involves overageing past peak hardness (T6 temper) to near the T7 temper. A subsequent reaging at 120C for 24 hours returns the hardness and strength to or very nearly to T6 temper levels.

RRA treatments can be accomplished with many different procedures. The general guidelines are retrogressing between 180C-240C for 15min-10s.

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Uses

7000 series alloys such as 7075 are often used in transport applications, including marine, automotive and aviation, due to their high strength-to-density ratio  Their strength and light weight is also desirable in other fields. Rock climbing equipment, bicycle components, inlineskating-frames and hang glider airframes are commonly made from 7075 aluminium alloy. Hobby grade RC models commonly use 7075 and 6061 for chassis plates. One interesting use for 7075 is in the manufacture of M16 rifles for the American military. In particular high quality M16 rifle lower and upper receivers as well as extension tubes are typically made from 7075-T6 alloy. Desert Tactical Arms and French armament company PGM use it for their precision rifles. It is also commonly used in shafts for lacrossesticks, such as the STX sabre, and camping knife and fork sets.

Due to its high strength, low density, thermal properties and its ability to be highly polished, 7075 is widely used in mold tool manufacture. This alloy has been further refined into other 7000 series alloys for this application, namely 7050 and 7020.

History

The first 7075 was developed in secret by a Japanese company, Sumitomo Metal, in 1936.[10] 7075 was used for the Mitsubishi A6M Zero fighter's air frame for the Imperial Japanese Navy starting in 1940.

Trade names

7075 has been sold under various trade names including Zicral, Ergal and Fortal Constructal.

Some 7000 series alloys sold under brand names for making moulds include Alumec 79, Alumec 89, Contal, Certal, Alumould, and Hokotol.

Aluminium Alloy 7075

 

Chemical Composition Limits

Weight%

Al

Si

Fe

Cu

Mn

Mg

Cr

Zn

Ti

Other Each

Others Total

7075 min

Rem

-

-

1.2

-

2.1

0.18

5.1

-

-

-

7075 max

Rem

0.40

0.50

2.0

0.30

2.9

0.28

6.1

0.20

0.05

0.15

Aluminium Alloy 7075 offers the highest strength of the common screw machine alloys. The superior stress corrosion resistance of the T173 and T7351 tempers makes alloy 7075 a logical replacement for 20242014 and 2017 in many of the most critical applications. The T6 and T651 tempers have fair machinability. Alloy 7075 is heavily utilized by the aircraft and ordnance industries because of its superior strength.

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Typical Mechanical Properties

Material

Temper

Size (")

Tensile Strength (ksi)

Yield Strength (ksi)

Elongation in 2" %

Alloy 7075 Bar

T651

-

77

66

7

Alloy 7075 Bar

T7351

<4"

68

56

10

Alloy 7075 Bar

T73511

<0.25

68

58

7

Alloy 7075 Bar

T73511

0.25 - 1.5

70

61

8

Alloy 7075 Bar

T73511

1.5 - 3.0

69

59

8

Alloy 7075 Bar

T6511

<0.25

78

70

7

Alloy 7075 Bar

T6511

0.25 - 0.5

81

73

7

Alloy 7075 Bar

T6511

0.5 - 3.0

81

72

7

 

Material

Temper

Thickness (in)

Tensile Strength (ksi)

Yield Strength (ksi)

Elongation %

Alloy 7075 Sheet

T6 Bare

0.125 - 0.25

78

69

8

Alloy 7075 Sheet

T651 Bare

0.25 - 0.50

78

67

9

Alloy 7075 Sheet

T651 Bare

0.5 - 1.0

78

68

7

Alloy 7075 Sheet

T6 Clad

0.188 - 0.25

75

64

8

Alloy 7075 Sheet

T651 Clad

0.25 - 0.50

75

65

9

Alloy 7075 Sheet

T651 Clad

0.5 - 1.00

78

68

7



Typical Physical Properties

 

Characteristic

English

Metric

Nominal Density (68° F / 20°C)

0.101 lbs./ in ³

2.80 Mg/m³

Melting Range

990° F - 1175° F

532°C - 635 °C

Specific Heat (212 °F / 100°C

0.23 BTU/lb - °F

960 J/kg-°K

Availability

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Specifications
BS 2 L95 Alloy 7075-T651 Plate
BS 2 L88 Alloy 7075-T6 Clad Sheet and Strip
BS L160 Alloy 7075-T73511 Bars and Sections
BS L161 Alloy 7075 Forging Stock and Forgings 
BS L162 Alloy 7075 Forging Stock and Forgings 
BS L170 Alloy 7075-T6511 Bars and Sections
DTD 5110 7075 Clad Plate
DTD 5124 7075 Bars and Sections
AMS 4038 7075-T651 Superseded by AMS 4045
AMS 4039 7075-T651 Superseded by AMS 4049
AMS 4044 7075 -0 Sheet and Plate
AMS 4045 7075-T6 Sheet and T651 Plate
AMS 4046 7075-T6 Alclad one side Sheet, T651 Plate
AMS 4048 7075-T0 Alclad Sheet and Plate
AMS 4049 7075 -T6 Alclad Sheet and T651 Plate
AMS 4078 7075-T351 Plate 
AMS 4122 7075-T6 Cold finished rod, bar, wire
AMS 4123 7075-T651 Cold finished bar, rod 
AMS 4124 7075-T7351 Cold finished bar, rod, wire
AMS 4126 7075-T6 Forgings 
AMS 4131 7075-T74 Forgings
AMS 4139 7075 Forgings (Non-Current)
AMS 4141 7075-T73 Die Forgings 
AMS 4147 7075-T7352 Forgings
AMS 4154 7075-T6 Extrusions 
AMS 4166 7075-T73 Extusion
AMS 4167 7075-T73511 Extrusions 
AMS 4168 7075-T6511 Extrusions Unstraightened
AMS 4169 7075-T6511 Extrusions Straightened 
AMS 4174 7075-T73 Flash Welded Rings
AMS 4186 7075-TF Cold finished bar, rod, wire
AMS 4187 7075-0 Cold finished bar, rod, wire
QQ-A-250/13 7075-0 Alclad sheet and plate
QQ-A-250/13 7075-T6 Alclad sheet and plate
QQ-A-250/18 7075-0 Clad one side, sheet and plate
QQ-A-250/18 7075-T6 Clad one side, sheet and plate
QQ-A-250/24 7075-T7651 Plate
QQ-A-250/25 7075 Sheet, clad with7072-T76
QQ-A-250/26 7075 Sheet, clad with7011-T76
QQ-A-367 Alloy 7075-T6 Forgings
MIL-A-22771
AIR 9048.690 7075-T7351 Plate
AIR 9048.700 7075-T7351 Plate
AIR 9048.710 7075-T7351 Plate
AIR 9049 

Disclaimer
Every effort is made to ensure that technical specifications are accurate. However, technical specifications included herein should be used as a guideline only. All specifications are subject to change without notice.

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