高強度變形鎂合金ZK60合金相的控制與成分優(yōu)化.pdf

1、重慶大學碩士學位論文高強度變形鎂合金ZK60合金相的控制與成分優(yōu)化姓名：麻彥龍申請學位級別：碩士專業(yè)：材料學指導教師：潘復生20040525英文摘要AbstractInthispaperthemechanismofhowalloyphasesformedandtransferredinZK60magnesiumalloywasdeterminedTheinfluencesofchemicalcomponents，castingtechn

2、ologiesandheat—treatmenttechnologiesonparametersofalloyphaseswereanalyzedTheresultsservedasmainprinciplestocontrolalloyphasesandoptimizecomponentsMorphologycategoryamountanddistributionofalloyphaseswerestudiedbyusingmeth

3、odolegiesofmetallurgicalphaseanalysis，scanningelectronmicroscopy(SEM)analysis，xrayanalysis，energydiffractionxray(EDX)analysisandtransmissionelectronmicroscopy(TEM)inas—cast，solutiontreatedandasagedZK60magnesiumalloyInadd

4、ition，theeffectofzinc，zirconiumandyttriumonalloyphaseswasinvestigatedonbasisofZK60magnesiumalloyTheresearchindicatedthattherewasagreatdealofeutecticwithmaincomponentsofa—MgandMgZnTheeutectichadvariousmorphologiesanddistr

5、ibutedinmanywaysThetwo—stagesolutiontechnologyr380“C12h5lOC12h)couldeffectivelyreducethesecondphasesandsoftenthematrixMgZn2phase，informofparallelogram，200nmtO500nminlength，havingnOfixedorientationrelationshipwithmatrix，n

6、otsensitivetoheattreatment，wasfoundinas—cast，solutiontreatedandas—agedZK60alloyaswellMgZnphase，inlengthof500nm，hadfixedorientationrelationshipwithmatrixM92Zn3phase，informoflOOnmshortrob，wasthemostfinephaseintermsofsizean

7、dthemostevenphaseintermsofdistributioninZK60alloyWiththeincreaseofzinccontent，theamountofeutecticwentdownfirstandthenwentup，thedimensionanddistributionofwhich，howeveLgotmoreandmorefineandeverWiththeincreaseofzirconiumcon

8、tent，theamountofbinaryMg—ZnphasesdecreasedintensivelyZirconiumcouldnotonlyfinethegrainbutalsoformprecipitationphaseandevenpresentaszirconiumparticlesAlloycontainingyttriumhadfish—bonelikeeutecticstructureandcontinuousret