Spray forming of Al–Si–Pb alloys and their.pdf
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Spray forming of Al–Si–Pb alloys and their.pdf

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MaterialsScienceandEngineeringA383(2004)30–38SprayformingofAl–Si–PballoysandtheirwearcharacteristicsG.B.Rudrakshi,V.C.Srivastava,J.P.Pathak,S.N.Ojha∗CenterforAdvancedStudy,DepartmentofMetallurgicalEngineering,InstituteofTechnology,BanarasHinduUniversity,Varanasi221005,IndiaReceived27January2004AbstractAmodifiedsprayformingprocessisdescribedtosynthesizeliquidimmisciblealloysbasedonAl–Si–Pbsystem.Theatomizationofthemeltwascarriedoutatagaspressureof1.0MPaandthenozzletosubstratedistancewasvariedfrom0.35to0.55m.Themicrostructureandwearcharacteristicsofthespray-depositswereinvestigated.Theresultsinvariablyexhibitedanequiaxedgrainmorphologyoftheprimary␣-phasewithvariationingrainsizefrom10to25␮minadditiontoauniformdispersionofultra-fineparticlesofleadandglobularsiliconparticlesinAl-matrix.ThesizeofSiparticlesvariedfrom0.5to5␮mandthatofPbparticlesfrom0.1to25␮mwithvariationindepositiondistance.Themicrostructuralvariationwasalsoobservedindifferentregionsofthedeposit.Theatomizedpowderparticlesrevealedtwodifferenttypesofmicrostructures,theoneshowingacellular-dendriticmorphologyoftheprimary␣-phasewhereastheotherexhibitedfinesphericalAl-particlesdispersedinthematrixofPb-richphase.ThewearrateandthecoefficientoffrictionofAl–Si–PballoywereobservedtobelowerthanthatofAl–Sialloyatloadsvaryingfrom10to90Nataslidingvelocityof1.0ms−1.Thepossiblereasonsforthisbehaviourarediscussedinthelightofmicrostructuralfeaturesofthealloyandthenatureofthewornoutsurfacesoftheweartestspecimens.©2004ElsevierB.V.Allrightsreserved.Keywords:Sprayforming;Liquidimmisciblealloys;Microstructure;Wearcharacteristics1.Introductionlurgy[13],rheocasting[14,15],meltspinning[16],stripcasting[17],andsprayforming[18–20],resultinauni-TheliquidimmisciblealloysbasedonAl–PbsystemformdistributionofleadparticlesinAlmatrix.However,arepotentialmaterialsforapplicationinautomobileandsomeofthesetechniquesareoftenassociatedwitheitheraerospaceindustries[1–5].However,theirprocessingbyahigherenergyconsumptiono