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1、Instructors‘SolutionManualTHESCIENCEANDENGINEERINGOFMATERIALSFourthEditionInstructors‘SolutionManualTHESCIENCEANDENGINEERINGOFMATERIALSFourthEditionDonaldR.AskelandPradeepP.PhuléPreparedbyGregoryLea1IntroductiontoMaterialsScienceandEngineering1–5Ironisoftencoatedwithathinlayerof
2、zincifitistobeusedoutside.Whatcharac-teristicsdoyouthinkthezincprovidestothiscoated,orgalvanized,steel?Whatprecautionsshouldbeconsideredinproducingthisproduct?Howwilltherecycla-bilityoftheproductbeaffected?Solution:Thezincprovidescorrosionresistancetotheironintwoways.Iftheironis
3、completelycoatedwithzinc,thezincprovidesabarrierbetweentheironandthesurroundingenvironment,thereforeprotectingtheunderlyingiron.Ifthezinccoatingisscratchedtoexposetheiron,thezinccontinuestoprotecttheironbecausethezinccorrodespreferentiallytotheiron(seeChapter22).Tobeeffective,th
4、ezincshouldbondwelltotheironsothatitdoesnotpermitreactionstooccurattheinterfacewiththeironandsothatthezincremainsintactduringanyformingofthegalvanizedmaterial.Whenthematerialisrecycled,thezincwillbelostbyoxidationandvaporization,oftenproducinga“zincdust”thatmayposeanenvironmenta
5、lhazard.Specialequipmentmayberequiredtocollectandeitherrecycleordisposeofthezincdust.1–6Wewouldliketoproduceatransparentcanopyforanaircraft.Ifweweretouseaceramic(thatis,traditionalwindowglass)canopy,rocksorbirdsmightcauseittoshatter.Designamaterialthatwouldminimizedamageoratleas
6、tkeepthecanopyfrombreakingintopieces.Solution:Wemightsandwichathinsheetofatransparentpolymerbetweentwolayersoftheglass.Thisapproach,usedforwindshieldsofautomobiles,willpreventthe“safety”glassfromcompletelydisintegratingwhenit12TheScienceandEngineeringofMaterialsInstructor’sSolut
7、ionManualfails,withthepolymerholdingthebrokenpiecesofglasstogetheruntilthecanopycanbereplaced.Anotherapproachmightbetouseatransparent,“glassy”polymermaterialsuchaspolycarbonate.Somepolymershavereasonablygoodimpactpropertiesandmayresistfailure.Thepolymerscanalsobetoughenedtoresis
8、timpactbyintroducingtinyglobulesofarubber,orela
