納米Al-,2-O-,3-顆粒增強(qiáng)黃銅基復(fù)合材料的研究.pdf

1、浙江大學(xué)碩士學(xué)位論文納米AlO顆粒增強(qiáng)黃銅基復(fù)合材料的研究姓名：張紅霞申請學(xué)位級別：碩士專業(yè)：材料加工工程指導(dǎo)教師：胡樹兵涂江平20031001溉涎大攀頸士夠霞論文簿溪StudiesOllNanoAl203Re；nforcedBrassMatriXCompositeA轉(zhuǎn)S罩鬏AC下AnovelmaterialsofnanoA1203reinforeedbrasscompositehasbeendevelopedbytheprocesse

2、smechanicalalloying(鹺A)andsinteringunder‘pressurehereafterinthepresentthesis。TkmorphologyofthecompositeparticlesandThestmct戳oftransformationofAI＼ZnO，AI＼CuOandCuZnA1203mixedduringmechanicalalloyingprocesshasbeeninvestigat

3、edbyseveralmethods，ie。xraydiffraction(XRD)，scanningelectronmicroscopy(SEM)，differentialthermalanalysis(DTA)Onthisbasis，theCuZnA1203compositea10eproduced。ThemechanicalalloyingprocessofAl“ZnO、e毯0powdersisinvestigated。Resul

4、tsshowthatthepowdersofmixedAI—ZnO＼CuOundergosevereplasticdeformation，cold，weldingandfractureduetothecollisionofballsduringmechanicalalloyingandcompositeparticlesofZn＼CuA1203ateformed，inwhichexiststhetypicallanaellarstruc

5、tureProlongedmillingtime，lamellatstructurewillberefined，agreatdealofinternalstrainandcrystallatticedistortionateaccumulatedinthepowders。TheAi203particleisformedbyalocalmetathesisreactionduringballmillingmidexitsagestatin

6、gperiod。IncreasingthemillingtimeandthesinteringtemperaturearebothadvantageousfortheformationofA1203ThedistributionofA1203particlesinmatrixisuniformand黔microormacrosegregationexist，Thecombinationbetweenthereinforcedphaseo

7、fA1203andthematrixisstrong。InvestigationontheCuZn—A1203systemshowsthatAt203andaCupowdercanbeformedthroughballmilting，InthegestatingperiodtheZn娃ch#phaseareformedfirstlyandthentransformtoCurich程phase。薯醞latticeparameterof鑊C

8、u(Zn)isincreasedThe豁越nofd。CuisrefinedandthestrainincreasescontinuallyintheballmillingofprocessofCuZn—AI；!03powdersButafter75hoursBallmillingtime，themetay—phaseisformed，thelatticeparameterofd—Cu(Z拄)shouldbedecreased，Theco

9、mpositeparticleswithdispersionA1203havebeenpreparedafter120hoursmillingtime。Thegrainofcompositepowdersisabout22瓣insize。嗣瞻sinteringl囂chnologyandpropertiesofCutZnAlz03compositearestudiedTheresultsindicatethatthebestsinteri