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| PRODUCT DATA of AA7075-T73 |
| Material | AA7075-T73 |
| Product Datasheet | Alcoa 7075 plate and sheet
Alcoa alloy 7075 |
| General Information | The 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 Assembly | Solution heat treated and then specially artificially aged. Applies to 7075 alloys which have been specially aged to make the material resistant to stress-corrosion |
| 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 |
| Chemical Composition | 5.6% Zn, 2.5% Mg, 1.6% Cu, 0.3% Cr, Rem. Al |
| EXPERIENCE IN PRACTICE |
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| 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 |
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| Crystal Structure | Face centered cubic (fcc) |
| Specific Gravity | 2.8 Remark: @RT |
| Phase changes | Alloy is subject to precipitations |
| Magnetic Properties | Nonmagnetic |
| MECHANICAL PROPERTIES |
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| Ultimate Tensile Strength | 427 to 483 MPa Remark:Exact value depends on test direction @ Room Temperature Data Quality: Limited Laboratory testing |
| Proof Stress (0.2%) | 338 to 421 MPa Remark:Exact value depends on test direction @ Room Temperature Data Quality: Limited Laboratory testing |
| Elongation | 3 to 8 % Remark:Exact value depends on test direction @ Room Temperature Data Quality: Limited Laboratory testing |
| Fracture Toughness (KIc) | 30.2 to 38.6 MPa.m^1/2 |
| ELECTRICAL PROPERTIES |
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| Electrical Volume Resistivity | 8.9e-8 ohm.m Remark:@ Room Temperature |
| THERMAL PROPERTIES |
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| 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 |
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| 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 |
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| 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 |
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| 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. |