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	PRODUCT DATA of AA7475-T73

Material	AA7475-T73
Product Datasheet	Alcoa 7475 plate and sheet
General Information	This is a high strength alloy of very good toughness. It is a derivative of AA 7075 alloy and the AA 7475 version is available in sheet and plate product forms.
Processing and Assembly	Solution heat treated and then artificially overaged in order to achieve the best stress corrosion resistance
Precautions	Data for AA7475-T7351 from Aluminum Association.

	EXPERIENCE IN PRACTICE

Development Status	Commercial Product
Equivalent Designations	AA 7475
Space Experience	Good

	PHYSICAL PROPERTIES

Crystal Structure	Face centered cubic (fcc)
Specific Gravity	2.81
Magnetic Properties	Nonmagnetic

	ELASTIC PROPERTIES

Tensile Modulus	71.7 GPa Data Quality: Typical Data
Shear Modulus	27 GPa Data Quality: Typical Data
Poisson Ratio	0.33

	THERMAL PROPERTIES

Thermal Conductivity	138 W/m.K
Thermal Expansion Coefficient	23.2 μstrain/°C
Melting Range	477 to 635 °C
Specific Heat	0.88 J/g.K

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status	Requires specific corrosion protection
Stress Corrosion Status	High Resistance to SCC: Table 1 Data Quality: Design Data
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
Machinability	Machining characteristics are very good in the annealed condition. Use of oil base lubricants for all machining operations is recommended.
Welding	Not normally done to this alloy and no data on techniques available at this time.
Aging	Heat treatment may be done. However the parameters of the treatment are proprietary to Alcoa.

	SPECIAL RECOMMENDATIONS

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.