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	PRODUCT DATA of AA7175-T736

Material

AA7175-T736

General Information

7175 is a high strength, heat treatable, forging alloy. It has an excellent combination of toughness and strength, similar to 7075 alloy except that the 7175 version has superior toughness and tensile strength.

Processing and Assembly

Solution heat treated and then artificially overaged (between T73 and T76 (now T74)

Precautions

data from ASM. Not for design

Chemical Composition

Al-5.6Zn-2.5Mg-1.6Cu-0.23Cr

	EXPERIENCE IN PRACTICE

Development Status

Commercial Product

Equivalent Designations

AA 7175

Space Experience

Good

	PHYSICAL PROPERTIES

Crystal Structure

Face centered cubic (fcc)

Magnetic Properties

Nonmagnetic

	ELASTIC PROPERTIES

Tensile Modulus

72 GPa

Poisson Ratio

0.33

	MECHANICAL PROPERTIES

Ultimate Tensile Strength

524 MPa

Proof Stress (0.2%)

455 MPa

Elongation

11 %

Fatigue Limit

159 MPa

Fracture Toughness (KIc)

23.1 to 33 MPa.m^1/2

Hardness

145 HRb

Shear Strength

290 MPa

	RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY

General Corrosion Status

Requires specific corrosion protection

Stress Corrosion Status

Moderate Resistance to SCC: Table 2 Remark: Requires Stress corrosion evaluation form 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

The alloy is machinable. However no specific comments are available. Consult the supplier.

Aging

This is an age hardenable alloy.

	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.