MP重点归纳特殊标记出来的2

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1、MP11.Pleasedeterminetrueorfalseaboutthefollowingstatements:a.Inorganicandorganicmaterialsareallbelongtometal-typematerial(F)b.Allcarbonbasedmaterialsareorganicmaterials.(F)c.Materialscienceincludesmaterialchemistryandmaterialphysics(T)d.Insomesense,materialengineeringcanbetreatedasmateri

2、alprocessing.(T)MP3Plspickoutthetruestatementsamongthefollowingitems:a)Newphaseusuallymakesnucleationatdefectpoints.Tb)Solidstatephasetransformationiseasiertoidentify.Fc)Precipitationisasecondordersolidphasetransformation.Fd)Phasediagramreflectsphasesunderthermodynamicequilibriumconditio

3、nsTe)Insolidstatephasetransformation,thenewphasegenerallygrowsalonghabitplane.Tf)Polycrystallinetransformationisafirstorderphasetransformationanditisdiffusional.Tg)Insecondorderphasetransformation,thereexistvolumeandentropychangesFh)Eutectoidtransformationisakindofdiffusionaltypetransfor

4、mation.TMP4Trueorfalsequestions:a)Theyieldstrengthshowstheresistanceofthematerialstopermanentdeformation.Tb)Theplasticdeformationisakindoftemporarydeformation.Fc)Theyieldstressofceramicsisgenerallyhigherthanthatofmetals.Td)Themaximumstrengthinthestress-straincurveistheyieldstrength.Fe)Du

5、ctilityindicatesthegeneralabilityofamaterialtobeplasticallydeformed.Tf)Plasticdeformationisgenerallyrealizedbyatomicplaneslipping.Tg)Metalspossesslargedislocationwidth,resultinginsmallyieldstrength,thusmoreductile.Whileceramicspossesssmalldislocationwidth,thuslatticeresistanceislarge,lea

6、dingtobrittlefeature.Th)Materialwithmoreslipsystemexhibitsbetterductility.TMP59.trueorfalsequestions1)Ifonlythefreecarrierdensityishigh,materialexhibitshighconductivity.F2)Theconductivityofsemiconductorsislowerthanmetal.T3)Freeelectronsinmetalpossesswaveparticleduality.T4)Maxwellboltzman

7、statisticsisnotvalidtofreeelectroninmaterials.T5)Bose-einsteinstatsticsbelongstoquantumstatistics,applyingtosystemthatdoesnotobeyPaullexclusiverule.TMP61.Trueorfalsequestions1)EnergydistributionoffreeelectronsinametalobeysFermi-Diracdistribution(T)2)Thenumberofoccupiedcol