(完整word版)MP重点归纳特殊标记出来的2.doc
上传人:是你****盟主 上传时间:2024-09-11 格式:DOC 页数:25 大小:3MB 金币:10 举报 版权申诉
预览加载中,请您耐心等待几秒...

(完整word版)MP重点归纳特殊标记出来的2.doc

(完整word版)MP重点归纳特殊标记出来的2.doc

预览

免费试读已结束,剩余 15 页请下载文档后查看

10 金币

下载此文档

如果您无法下载资料,请参考说明:

1、部分资料下载需要金币,请确保您的账户上有足够的金币

2、已购买过的文档,再次下载不重复扣费

3、资料包下载后请先用软件解压,在使用对应软件打开

MP1Pleasedeterminetrueorfalseaboutthefollowingstatements:Inorganicandorganicmaterialsareallbelongtometal-typematerial(F)Allcarbonbasedmaterialsareorganicmaterials.(F)Materialscienceincludesmaterialchemistryandmaterialphysics(T)Insomesense,materialengineeringcanbetreatedasmaterialprocessing.(T)MP3Plspickoutthetruestatementsamongthefollowingitems:Newphaseusuallymakesnucleationatdefectpoints.TSolidstatephasetransformationiseasiertoidentify.FPrecipitationisasecondordersolidphasetransformation.FPhasediagramreflectsphasesunderthermodynamicequilibriumconditionsTInsolidstatephasetransformation,thenewphasegenerallygrowsalonghabitplane.TPolycrystallinetransformationisafirstorderphasetransformationanditisdiffusional.TInsecondorderphasetransformation,thereexistvolumeandentropychangesFEutectoidtransformationisakindofdiffusionaltypetransformation.TMP4Trueorfalsequestions:Theyieldstrengthshowstheresistanceofthematerialstopermanentdeformation.TTheplasticdeformationisakindoftemporarydeformation.FTheyieldstressofceramicsisgenerallyhigherthanthatofmetals.TThemaximumstrengthinthestress-straincurveistheyieldstrength.FDuctilityindicatesthegeneralabilityofamaterialtobeplasticallydeformed.TPlasticdeformationisgenerallyrealizedbyatomicplaneslipping.TMetalspossesslargedislocationwidth,resultinginsmallyieldstrength,thusmoreductile.Whileceramicspossesssmalldislocationwidth,thuslatticeresistanceislarge,leadingtobrittlefeature.TMaterialwithmoreslipsystemexhibitsbetterductility.TMP59.trueorfalsequestionsIfonlythefreecarrierdensityishigh,materialexhibitshighconductivity.FTheconductivityofsemiconductorsislowerthanmetal.TFreeelectronsinmetalpossesswaveparticleduality.TMaxwellboltzmanstatisticsisnotvalidtofreeelectroninmaterials.TBose-einsteinstatsticsbelongstoquantumstatistics,applyingtosystemthatdoesnotobeyPaullexclusiverule.TMP61.TrueorfalsequestionsEnergydistributionoffreeelectronsinametalobeysFermi-Diracdistribution(T)Thenumberofoccupiedcollectiveelect