ALLOY 7075 PLATE AND SHEET - Calm Aluminium

1 ALLOY 7075 PLATE AND SHEETALL AROUND CONSISTENT PERFORMANCEALCOA MILL PRODUCTSDESCRIPTIONI ntroduced by Alcoa in 1943, ALLOY 7075 has been the standard workhorse 7 XXX series ALLOY within theaerospace industry ever since. It was the first successful Al-Zn-Mg-Cu high strength ALLOY using thebeneficial effects of the alloying addition of chromium to develop good stress-corrosion crackingresistance in SHEET products. Although other 7 XXX alloys have since been developed with improvedspecific properties, ALLOY 7075 remains the baseline with a good balance of properties required foraerospace 7075 is available in bare and alclad SHEET and PLATE product forms in the annealed state as wellas several tempers of the T6, T73 and T76 7075 SHEET and PLATE products have application throughout aircraft and aerospace structureswhere a combination of high strength with moderate toughness and corrosion resistance are applications are alclad skin SHEET , structural PLATE components up to 4 inches in thickness andgeneral aluminum aerospace COMPOSITION LIMITS (WT.)

2 %)Si .. , each .. , total .. , AluminumCr .. : Value maximum if range not PROPERTIESALLOY 7075 TEMPERTHICKNESSTENSILE STRENGTHYIELD STRENGTHELONGATIONin. (mm)ksi (MPa)ksi (MPa)% (max)21 (max)9-10 SHEET & PLATE ( )(276)(145) ( )(510-538)(434-476) ( )(538-462)(462-372) ( )(503)(427) ( )(496-490)(421-414) ( )(462)(386) ( )(476-421)(393-331) ALLOY 7075 All values are minimum long transverse mechanical properties except where STRENGTHYIELD STRENGTHELONGATIONin. (mm)ksi (MPa)ksi (MPa)% (max)20-21 (max)9-10 SHEET & PLATE ( )(248-276)(138-145) ( )(469-524)(400-448) ( )(517-462)(448-372) ( )(469-482)(393-407) ( )(476-490)(400-414) ( )(434-455)(352-372) ( )(455-476)(372-393)ALCLAD 7075 Two side cladding.

3 Nominal cladding thickness is 4% on gauges under in. ( mm); ongauges over in. ( mm). Property values for one side clad material are similar (not shown).All values are minimum long transverse mechanical properties except where TOUGHNESSA lloy 7075 SHEET and PLATE products offer moderately good strength/toughness relationships and arethe standard of comparison for more recent 7 XXX series ALLOY developments. ALLOY 7075 SHEET and plateproducts are not offered with guaranteed minimum fracture toughness :ksi in. (MPa m)*ALLOYTEMPERL-TT-L7075T65126 ( )22 ( )T735130 ( )26 ( )TYPICAL FRACTURE TOUGHNESS VALUESA lloy 7075 PlateFATIGUE PROPERTIESCOMPARISON OF AXIAL-STRESSNOTCH-FATIGUE DATA FOR ALLOYS7075-T73 XXX 2024-T351 AND 7475-T7351 PRODUCTSThe fatigue behavior of ALLOY 7075 PLATE products is shown in theaccompanying figure comparing axial-stress notch-fatigue data of 2 XXX and 7 XXX series in.

4 ( mm)60 Notch Tip Radiuse = in. ( mm)Kt = 3 Stress Ratio R = 0 exceptMaximum Stress, ksiMaximum Stress, MPaCyclesAlloy in.( mm)7060504030201001002003004000103104105 106107108109102*Compact specimen (ASTM E399) ALLOY 7075 ALCOA MILL PRODUCTS BOX 8025 BETTENDORF, IOWA 52722 (800) 523-9596 crack growth behavior under spectrum loading is becomingincreasingly important in the selection of alloys for fatigue criticalaircraft structures. Various high strength aerospace alloys arecompared for life prediction in flight hours using two types offatigue spectrums; a wing root application (tension dominated),and a horizontal tail application (tension-compression).SPECTRUM FATIGUE RANKINGFATIGUE CRACK GROWTHF atigue crack growth rates for PLATE products of 7075-T6 inconstant amplitude tests are compared with products of alloys2024, 7050, and OF FATIGUE CRACK GROWTH RATE DATA FORALLOY 7075-T651, 2024-T351 AND 7475-T651 PLATECORROSION RESISTANCEA lloy 7075 has been thoroughly evaluated for corrosion resistance of atmospheric weathering, stress-corrosion cracking and exfoliationin all currently available tempers.

5 These values have been used as a standard for comparison in the development of more recent highstrength aerospace alloys. Within the 7 XXX series of alloys,resistance to general corrosion attack, SCC and exfoliation improvessignificantly in the overage tempers (T7 type) compared with peakstrength tempers (T6).Generally, the T76 type temper is considered the exfoliation resistanttemper, while the T73 type temper is considered the SCC resistanttemper. It should be noted that T73 is as resistant to exfoliationas T76, but at lower strength applications where good surface appearance is required or incorrosive environments, alclad 7075 SHEET and PLATE products TREATMENTMany heat treatments and heat treating practices are available todevelop optimum strength, toughness and other desirable charac-teristics for proper application of ALLOY 7075 SHEET and plateproducts.

6 Refer to MIL-H-6088, Heat Treatment of AluminumAlloysfor additional SPECIFICATIONSPLATET emperT651T7651 SpecificationQQ-A-250/13QQ-A-250/24 MIL-HDBK-5 ApprovedBARE SHEETALCLAD SHEETS pecificationQQ-A-250/12,24QQ-A-250/13,25 ,26 MIL-HDBK-5 ApprovedApprovedOTHER PRODUCT FORMSO ther product forms of ALLOY 7075 are extrusions, forgings, wirerod and bar, and :1. The Aluminum Association, Standards and The Aluminum Association, Position on Fracture ToughnessRequirements and Quality Control Testing MIL-H-6088, Heat Treatment of Aluminum Alloys. 20,00015,00010,0005,00002024-T3517475-T6 517475-T73517050-T74517075-T73517075-T65 125,000 yyyyyyyyyyyyyy yyyyyy yyyyy yyyyyyyyyy yyyyy yyyyyyyy yyyySimulated flight hours, HTension dominated spectrum(Fighter wing root)Tension-compression spectrum(Fighter horizontal tail)(Average of two duplicate tests)10-5 K, MPa m a/ N, a/ N, m/cycle K, ksi orientationRoom temperatureMoist (RH > 90%) airR = + f = 25 HzWOL specimen thickness = in ( mm)10-610-710-810-510-410-310-610-710-81 0-910-910-10401051104051 Source: Navy Contract N00019-81-C-0550/Northrop SPECIFICATIONS ARE SUBJECT TO CHANGE WITHOUT NOTICE