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PRODUCT DATA of AA7075-T73
MaterialAA7075-T73
Product DatasheetAlcoa 7075 plate and sheet
Alcoa alloy 7075
General InformationThe T73 temper has a lower tensile and yield strength but improved fracture toughness combined with better stress corrosion resistance than the T6 temper
Processing and AssemblySolution heat treated and then specially artificially aged. Applies to 7075 alloys which have been specially aged to make the material resistant to stress-corrosion
PrecautionsAnodic 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 PrecludedAluminum 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
Chemical Composition5.6% Zn, 2.5% Mg, 1.6% Cu, 0.3% Cr, Rem. Al
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Cost RangeVery Low
Equivalent DesignationsDTD 5074A, AFNOR A-Z5GU, Werk No. 3.4364, AA 7075, AA7075
Space ExperienceGood
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Specific Gravity2.8
Remark: @RT
Phase changesAlloy is subject to precipitations
Magnetic PropertiesNonmagnetic
ELECTRICAL PROPERTIES
Electrical Volume Resistivity8.9e-8 ohm.m
Remark:@ Room Temperature
THERMAL PROPERTIES
Temperature Range121 °C(maximum)
Thermal Conductivity134 W/m.K
Remark: @ Room temperature
Thermal Expansion Coefficient22 μstrain/°C
Remark: @ Room temperature
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusRequires specific corrosion protection
Atmospheric CorrosionPoor 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 StatusHigh Resistance to SCC: Table 1
Remark: acc. to ECSS-Q-ST-70-36C
Data Quality: Design Data
EMF vs SCE-0.76 V
Bimetallic CorrosionCan 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 RecommendationsAlthough 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 LearnedIn some cases where the Zn content is at the high end of the composition range, this alloy responds poorly to black anodising.