7075 Aluminum Alloy

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1、7075AluminumAlloyMicrostructureandCurrentResearchthroughtheuseofIn-situX-rayDiffractionOutlineWhyAl7075?GeneralAluminumOverviewMicrostructureof7075CurrentDiffractionResearchonAl7075WhyAl7075?AluminumisanabundantresourceRelativelycheapHighstiffnes

2、s/densityandstrength/densityratiosDamagetolerantCorrosionresistantcomparedwithconventionalalloysUsesofAl7075GearsandshaftsAircraftOtherAerospaceanddefenseapplicationsGeneralAluminumAlloyOverviewPrincipalAluminumAlloysWroughtalloysaredividedintoseve

3、nmajorclassesClassessetbytheirprincipalalloyelementsThesevenclassescanbesubdivided:Strengthenedbyworkhardening1XXX,3XXX,4XXX,5XXXStrengthenedbyheattreatment(precipitationhardening)2XXX,6XXX,and7XXXOverviewWorkHardenedPrecipitateHardened1XXX-Commerc

4、ially•2XXX-Al.CopperPureAl.Alloys3XXX-Al.•6XXX-Al.Mg.Si.ManganeseAlloysAlloys4XXX-Al.Silicon•7XXX-Al.ZincAlloysAlloysQuickTime?andaTIFF(LZW)decompressorareneededtoseethispicture.7075Microstructure7075MicrostructureIngotcanform(Fe,Cr)SiAl,MgSiand/ora3

5、122pseudobinaryeutecticmadeupofAlandMg(Zn,Cu,Al)2.HeatingcausesironrichphasestotransformtoAlCuMg7precipitates.ChromiumisprecipitatedfromsupersaturatedsolutionasCrMgAldispersoids,2318concentratedheavilyintheprimarydendriteregion.Recrystallizedgrainsare

6、extremelyelongatedorflattenedbecauseofdispersoidbanding,andunrecrystallizedregionsaremadeupofveryfinesubgrainsinwhichboundariesaredecoratedbyhardeningprecipitatesAgingatelevated-temperaturecanprovide:•Stableproperties•Higherstrengths•Improvedcorrosionre

7、sistance•Lowerrateofgrowthoffatiguecracksare.DiffractionAppliedto7075ApproachMeasurethechangesinlatticespacingoftheaggregateasthespecimenisunderloadUseX-raydiffraction(XRD)Usex-raydiffraction(XRD)BraggDiffractionandXRDGeometryBraggDiffractionandXRDG

8、eometryLaue(transmission)geometrytomaximizestatisticalrelevanceofdiffractionvolumeLargeareadetectorNormalincidenceatdetectorisdesiredMonitortheazimuthalchangeinradiusoftheDebyeringsBraggÕsLaw2dsinhklhklGeometryQuickTime?an