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PRODUCT DATA of AA7175-T736
MaterialAA7175-T736
General Information7175 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 AssemblySolution heat treated and then artificially overaged (between T73 and T76 (now T74)
Precautionsdata from ASM. Not for design
Chemical CompositionAl-5.6Zn-2.5Mg-1.6Cu-0.23Cr
EXPERIENCE IN PRACTICE
Development StatusCommercial Product
Equivalent DesignationsAA 7175
Space ExperienceGood
PHYSICAL PROPERTIES
Crystal StructureFace centered cubic (fcc)
Magnetic PropertiesNonmagnetic
ELASTIC PROPERTIES
Tensile Modulus72 GPa
Poisson Ratio0.33
RELEVANT PROPERTIES FOR USE IN SPACE COMMUNITY
General Corrosion StatusRequires specific corrosion protection
Stress Corrosion StatusModerate Resistance to SCC: Table 2
Remark: Requires Stress corrosion evaluation form
Data Quality: Design Data
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
MachinabilityThe alloy is machinable. However no specific comments are available. Consult the supplier.
AgingThis is an age hardenable alloy.
SPECIAL RECOMMENDATIONS
Lessons LearnedIn some cases where the Zn content is at the high end of the composition range, this alloy responds poorly to black anodising.