简介：InordertoimprovethecorrosionandmechanicalpropertiesofAM50magnesiumalloy,1wt.%GdwasusedtomodifytheAM50magnesiumalloy.Themicrostructure,corrosionandmechanicalpropertieswereevaluatedbyX-raydiffraction(XRD),scanningelectronmicroscopy(SEM),energydispersivespectroscopy(EDS),electrochemicalandmechanicalstretchmethods.Theresultsindicatedthatβ-Mg17Al12phasedecreasedandAl2Gd3andAl0.4GdMn1.6phaseexistedafterGdaddition.BecauseoftheGdaddition,thegrainofAM50magnesiumalloywasrefinedsignificantly,whichimprovedthetensilestrengthofAM50magnesiumalloy.Thedecreasingofβphaseimprovedthecorrosionresistanceofthemagnesiumalloy.ThefracturemechanismoftheGdmodifiedAM50magnesiumalloywasquasi-cleavagefracture.Thecorrosionresidualstrength(CRS)ofAM50magnesiumalloywasimprovedafter1wt.%Gdaddition.

简介：ThesurfaceofacommercialY3Al5O12:Ce3+phosphorwasmodifiedby99%NH4F+CH3COOHsolutioninasupersonicbathwithwatertemperatureof80oCfor4h.Thescanningelectronmicroscopy（SEM）resultsshowedthattheedgeangleswerenotassharpastheunmodifiedparticlesandtheflatsurfacesturnedroughwithmanymicro-structurescovered.Positronlifetimemeasurementsquantitativelyshowedthatsurfacedefectswereremovedawaybymorethan50%.Asaresult,thephotoluminescencedeterminationsshowedthatthebackscatterlosswasreducedby4.2%andtheemissionpowerwasenhancedby5.6%afterthesurfacemodification.Theconversionefficiencywasgreatlyimprovedfrom47.3%to51.1%,aspresentedbythefluorescenceimages.Therefore,itwouldbegreatlyhelpfulfortheimprovementofefficiency,transparencyandstabilityofpc-LED.Moreover,thismethodwassignificantlysuitableformassproductionduetoitseasyoperationandlowcost.