应力对蠕变时效2524合金微观组织的影响.pdf

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1、TransaetionsofNonferrousMetals爱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．agedalloy．ThepredominantcontributiontothepeakhardnesscanbeascribedtotheGPBzoneswithanelasticstress．Keywords：cree

5、p．age；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