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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

	MECHANICAL PROPERTIES

Ultimate Tensile Strength

496 MPa Data Quality: Typical Data

Proof Stress (0.2%)

421 MPa Data Quality: Typical Data

Elongation

13 % Data Quality: Limited Laboratory testing

Fatigue Limit

220 MPa Data Quality: Typical Data

Fracture Toughness (KIc)

36 to 55 MPa.m^1/2 Data Quality: Typical Data

Hardness

82 HB Data Quality: Typical Data

Shear Strength

300 MPa Data Quality: Typical Data

	THERMAL PROPERTIES

Thermal Conductivity

138 W/m.K

Thermal Expansion Coefficient

23.2 μstrain/°C

Specific Heat

0.88 J/g.K

Melting Range

477 to 635 °C

	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.