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7075 Aluminium - Alloyed with zinc, magnesium, copper and chromium. Poor formability, good machinabilityYield strength between 32,000 and 76,000 psi.

7075 Aluminium is the other "aircraft grade" Aluminium that is carried by OnlineMetals. Its principal alloying ingredients are zinc and copper, which make it one of the highest-strength Aluminium alloys that are available. In fact, its typical strength in the T6 temper is higher than most mild steels. 7075 also has average-to-good ratings for machinability, corrosion resistance, and anodizing response. Like 2024, however, it is not considered to be weldable.

Principal Design Features
The 7075 alloy is capable of high strength as developed by heat treating. It also has excellent properties at low temperatures.

Forming
This alloy is comparatively strong for an Aluminium alloy. As such it produces greater springback during forming operations. Forming is best done in the annealed condition and if difficulty is encountered then warming the material to 200 - 250 F will assist formability.

Machinability
It is best to machine this alloy in the annealed condition. Machining capability is good and oil lubricants should be used.

Applications
Commonly used in the manufacture of aircraft and other aerospace applications not requiring the corrosion resistance of Clad 7075.

Welding
Resistance welding is the only preferred method of joining AL 7075 alloy. Gas welding should be avoided and use of arc welding may result in degradation of corrosion resistance.

Heat Treatment
This alloy may be solution annealed at 900 F for 2 hours at temperature, followed by a water quench. The alloy may then be given a precipitation hardening (aging) heat treatment -- see "Aging".

Forging
The alloy may be forged in the temperature range of 900 F to 700 F. It should be solution heat treated following forging.

Hot Working
Warming the material to 250 F will greatly assist formability.

Cold Working
Cold working is readily accomplished with the alloy in the soft, annealed, condition. Conventional forming methods may be used, but springback is greater for this alloy than for other of the Aluminium alloys.

Annealing
The temperature for annealing AL 7075 alloy is 775 F, holding at temperature for 3 hours. Controlled cooling at 50 F per hour should then be used down to 500 F from which it can then be air cooled.

Aging
Precipitation strengthening (aging) is done at 250 F for 24 hours and air cooled for T 6. The T 73 temper requires heating to 225 F for 8 hours followed by 24 hours at 325 F and air cooling.

Hardening
Hardens by precipitation heat treatment -- see "Aging".

Other Physical Props
Electrical conductivity 36% of copper.

Other Mechanical Props
Shear strength in O condition is 22 ksi and for the T6 condition it is 48 ksi.

7075 Aluminium
Physical and Mechanical PropertiesUltimate Tensile Strength, psi83,000
Yield Strength, psi73,000
Brinell Hardness150
Rockwell HardnessB87
ChemistryAluminium (Al)87.1 - 91.4%
Zinc (Zn)5.1 - 6.1% max
Copper (Cu)1.2 - 2.0%
Chromium (Cr)0.18 - 0.28%
Iron (Fe)0.5 max
Magnesium (Mg)2.1 - 2.9%
Manganese (Mn)0.3% max

 

Aluminium 7075
Specifications:AMS 4044
AMS 4045
AMS 4049
AMS 4131
AMS 4147
AMS 4154
AMS 4323
ASTM B209
ASTM B210
ASTM B211
ASTM B221
ASTM B241
ASTM B247
ASTM B316
ASTM B468
DMS 2233
MIL A-12545
MIL A-22771
MIL F-18280
MIL F-5509
QQ A-200/11
QQ A-200/15
QQ A-225/9
QQ A-250/13
QQ A-250/24
QQ A-367
QQ A-430
QQ WW-T-700/7
SAE J454
UNS A97075
Chemistry Data
AluminiumBalance
Chromium0.18 - 0.28
Copper1.2 - 2
Iron0.5 max
Magnesium2.1 - 2.9
Manganese0.3 max
Remainder Each0.05 max
Remainder Total0.15 max
Silicon0.4 max
Titanium0.2 max
Zinc5.1 - 6.1
Physical Data
Density (lb / cu. in.)0.101
Specific Gravity (kg/m3)2.80
Melting Point (Deg F)900
Modulus of Elasticity Tension10.4
Modulus of Elasticity Torsion3.8

Aluminium Pipes Mechanical Properties