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1、TransaetionsofNonferrousMetals愛Av-ai：lableonSlinecaitewwnwc．secieDnceidrierect．ctomSocietyofChinaPressTmns．NonferrousMet．Soc．China23(2013)2209—2214www．tnmsc．cnEffectofstressonmicrostructuresofcreep—aged2524alloyLi．weiQUAN，一，GangZHAO，NiTIAN，Ming．1iHUANG1．KeyLaboratoryforAn
2、isotropyandTextureofMaterials(MinistryofEducation)，NortheasternUniversity，Shenyang110004，China；2．SchoolofResourcesandMaterials，NortheasternUniversityatQinhuangdao，Qinhuangdao066004，ChinaReceived10July2012；accepted5December2012Abstract：Microstructuresofcreep—aged2524(A1—4．
3、3Cu-1．5Mg)agedat170。Cwithvariousstresses(0，173and250MPa)werestudiedonacreepmachine．Ageinghardnesscurvesundervariousstresseswereplottedandthecorrespondingmicrostructureswerecharacterizedbytransmissionelectronmicroscopy(TEM)．Theresultsshowthatthevalueofpeakhardnessisincreas
4、ed．whilethetimetoreachthepeakhardnessisreducedunderanexternalstress，Meanwhile，thelengthofS(AI2CuMg)phaseisshorterandthenumberdensityofSphasesislargerinthecreep．a(chǎn)gedalloy．ThepredominantcontributiontothepeakhardnesscanbeascribedtotheGPBzoneswithanelasticstress．Keywords：cree
5、p．a(chǎn)ge；Sphase；GPBzone；hardness；dislocation；stressorientationeffect1Introduction2ExperimentalInordertoreducethecostinthemanufactureofThechemicalcompositionofthecommercial2524airplane，age-formingwasexploredandstudiedtomeetalloyusedinthisworkislistedinTable1．Themisrequirement
6、．Ithasdrawnmuchattentionasitcarlspecimenswerepunchedfromas—receivedsheetwithdecreasethemanufacturingprocessesbycombiningbOm4mminthickness．Temperaturedependenceofyieldageingtreatmentandtheformingprocesswithelasticstrengthwasdeterminedtobe251MPaat170。Cusingstressapplyedtoth
7、ealloysheetduringtheageinganInstronmachine．Thenthesampleswithgagelengthprocess[1]．Thistechnologyhasbeensuccessfullyof22ITI1T1wereagedat170。CwithaereeDmachineappliedtoairplane[2]．Themechanismofage—formingundervariousconstantstresses．ThestressesapplyedtoofbinaryA卜Cualloyhas
8、beeninvestigated[3—7]．Andthealloywere0，173(-70％ao2，cr0．2=251MPaat170。C)itwasfoundthattheelastics
