稀土Y对Mg-5Al-1Sr-2Ca合金组织和耐腐蚀性能的影响.pdf

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1、RareMetalMaterialsandEngineeringAvailableonlineatwww．sciencedirect．cornVolume43，Issue1，January2014OnlineEnglisheditionoftheChineselanguagejourna黪ScienceDirectMicrostructureandCorrosionResistanceofMg-5AI--1Sr-2CaAIloyXieSuyun’PengXiaodong’．-LiJunchen’，WangChungu

2、ang’YangYan’，，，tChongqingUniversityChongqing400044．China；2NationalEngineeringResearchCenterforMagnesiumAlloysChongqing400044,Ch／naAbstract：TheeffectsofdifferentcontentsofYonmicrostructuresandcorrosionresistancesofMg一5Al—lSr．2Caalloyswereinvestigated．Mg-5A1-1Sr-

3、2Ca-XY0，0．5，0．7，1．0；wt％)alloyswerepreparedusingmixturemethodandwereanalyzedbyopticalmicroscopy(0M)，scanningelectronmicroscopy(SEM)andX—raydiffraction(XRD)．TheresultsindicatethatthegrainsizecanbeobviouslyreducedwhenthecontentofYis0．7wt％．WiththeadditionofY．Al，Yph

4、aseisformedandactsastheheterogeneousnucleusofa—Mgtoenhancethenucleationrate．Simultaneously．A12Yisaggregatedinthefrontofa·Mgandhindersthegrowthofa—Mggrains．ThecorrosionresistanceofMg一5A1—1Sr-2Ca-XY(X=O，0．5，0．7，1．O；wt％)alloysin3．5％NaC1aqueoussolutionwasinvestigat

5、edthroughstaticweight．1osstestandpolarizationcurvemeasurement．ItisfoundthatduetotheadditionofY，thecorrosionresistanceisimprovedsubstantially．Mg一5A1—1St一2Ca一0．7Yalloyhasalowcorrosioncurrentandthebestcorrosionresistanceamongtheinvestigatedalloys．Keywords：Y：Mg-5A1

6、—1Sr一2Ca；microstructure；corrosionresistanceMagnesiumalloysarethelighteststructuralmetalscontentsofYonthemicrostructuresandthecorrosionmaterialswhicharequiteattractiveforstructuralresistancesofMg-5A1—1Sr-2Caalloy．TheaimoftheapplicationsI一．Alkalineearthheat．resis

7、tantmagnesiumpresentresearchistodevelopaneffectivewaytoimprovealloyswithheat—resistanthavereceivedmuchattentionduethecorrosionresistanceofMg--5A1-·1Sr-—2Caalloy．tOtheirhightemperaturemechanicalproperties．which1Experimentalmakethemplayingsignificantroleintheavia

8、tion，spaceflightandweaponsfieldst一Drypuremagnesium(99．8％purity)，aluminum(99．8％．Meanwhile．alkalineearthheat—resistantmagnesiumalloyshavealowequilibriumpurity)，Mg一30％YandMg—lO