The Science And Engineering Of Materials Instructors Solution Manual 4Th Askeland教材

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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