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	PRODUCT DATA of AA7075-T7351

Material

AA7075-T7351

Product Datasheet

Alcoa 7075 plate and sheet Alcoa alloy 7075

General Information

The T7351 temper has a lower tensile and yield strength but improved fracture toughness combined with better stress corrosion resistance than the T6 temper

Processing and Assembly

Solution heat treated, stress relieved by stretching a controlled amount (permanent set 1.5 to 3% for sheet and plate, 1 to 3% for rolled or cold finished rod and bar, 1 to 5% for hand or ring forging and rolled ring) and then artificially aged in order to achieve the best stress corrosion resistance. The products recieve no further straightening after stretching

Precautions

Anodic coatings are widely used for corrosion protection. These coatings may affect the fatigue properties adversely, although the effects are fairly small. The adverse effect is due largely to the precleaning etching treatment, although the coating Itself may also produce some effect. Problems have been found with the black anodising

Hazardous and Precluded

Aluminum alloys with a high content of the heavy metals, particularly zinc, as alloying agents are not generally used in applications where a high neutron flux is present, since certain isotopes of these heavier metals exhibit long half lives leaving the part 'hot' for extended periods

Product Type

sheet/plate

Chemical Composition

5.6% Zn, 2.5% Mg, 1.6% Cu, 0.3% Cr, Rem. Al

Name of Manufacturer

Corus

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Cost Range

Very Low

Equivalent Designations

DTD 5074A, AFNOR A-Z5GU, Werk No. 3.4364, AA 7075, AA7075

Space Experience

Good

	PHYSICAL PROPERTIES

Crystal Structure

Face centered cubic (fcc)

Specific Gravity

2.8 Remark: @ RT

Phase changes

Alloy is subject to precipitations

Magnetic Properties

Nonmagnetic

	MECHANICAL PROPERTIES

Ultimate Tensile Strength

441 MPa(minimum) Remark: @ Room Temperature Data Quality: Minimum specification data

Proof Stress (0.2%)

338 MPa(minimum) Remark: @ Room Temperature Data Quality: Minimum specification data

Elongation

6 % Remark: @ Room Temperature Data Quality: Minimum specification data

Fracture Toughness (KIc)

30.2 to 38.6 MPa.m^1/2

	ELECTRICAL PROPERTIES

Electrical Volume Resistivity

8.9e-8 ohm.m Remark:@ Room Temperature

	THERMAL PROPERTIES

Temperature Range

121 °C(maximum)

Thermal Conductivity

134 W/m.K Remark: @ Room temperature

Thermal Expansion Coefficient

22 μstrain/°C Remark: @ Room temperature

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

Requires specific corrosion protection

Atmospheric Corrosion

Poor resistance to atmospheric corrosion and should always be protected. Although anodising is possible, the degree of protection it affords is not as great as with other Aluminium alloys, so painting is the recommended treatment.

Stress Corrosion Status

High Resistance to SCC: Table 1 Remark: acc. to ECSS-Q-ST-70-36C Data Quality: Design Data

EMF vs SCE

-0.76 V

Bimetallic Corrosion

Can be used in a non-controlled environment: Al alloys, Cd Can be used in a clean room environment: Mg, Sn-Pb alloys (all), Sn, Pb, Zn, Be Needs specific measures: All others Test:ECSS-Q-ST-70C Rev.1 Table 5.1 Data Quality: Design Data

	FLUID SYSTEMS COMPATIBILITY

Gaseous Oxygen (GOX)

Meets the mechanical impact requirements. No batch test required.

Liquid Oxygen (LOX)

Fails mechanical impact

Nitrogen Tetroxide (N2O4)

SCC susceptibility is low and no fluid decomposition

Hydrazine (HDZE)

Untested

	SPECIAL RECOMMENDATIONS

Special Recommendations

Although anodising is possible, the degree of protection it affords is not as great as with other Aluminium alloys, so painting is the recommended treatment

Lessons Learned

In some cases where the Zn content is at the high end of the composition range, this alloy responds poorly to black anodising.