Mechanical properties and microstructure evolution in ultrafinegrained

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1、JMaterSci(2013)48:47054712DOI10.1007/s10853-013-7151-xNANOSTRUCTUREDMATERIALSMechanicalpropertiesandmicrostructureevolutioninultrafine-grainedAZ31alloyprocessedbysevereplasticdeformationJitkaVra´tna´•MilosˇJanecˇek•JakubCˇ´ızˇek•DongJunLee•EunYooYoon•HyoungSeopKimRecei

2、ved:10November2012/Accepted:9January2013/Publishedonline:24January2013ÓSpringerScience+BusinessMediaNewYork2013AbstractCommercialMgAlZnalloyAZ31waspro-smearedoutandalmosthomogeneousultrafine-grainedcessedbytwotechniquesofsevereplasticdeformationstructurewasobservedinsp

3、ecimensubjectedto15HPT(SPD)extrusionfollowedbyequalchannelangularturns.Variationsinmechanicalpropertiesanddislocationpressing(EX-ECAP),andhighpressuretorsion(HPT).densityevolutionwerecomparedinconditionscorre-ProcessingbyECAPwasconductedatelevatedtempera-spondingtothe

4、sameequivalentstrainimposedbybothtureof180°Cfor112passesfollowingrouteBC.HPTtechniquesofSPD.wasappliedatroomtemperature,andthespecimensofthediameterof19mmwithdifferentnumberofturns(N=-15)wereprepared.MechanicalpropertiesandIntroductiongrainfragmentationwithstraindueto

5、EX-ECAPandHPTwereinvestigatedbyVickersmicrohardnessmeasurementsMagnesiumalloysareenergy-efficientmaterialswiththeandtransmissionelectronmicroscopy,respectively.Vari-potentialtoreplacesteel,aluminiumalloysorsomeplastic-ationsindislocationdensitywereinvestigatedbypositro

6、nbasedmaterialsinvariousapplications.Interestinmag-annihilationspectroscopy.Differencesinmicrohardness,nesium-basedmaterialshasrecentlybeenrevivedprimarilygrainrefinementanddislocationdensityevolutionresultingbecauseofgraduallyreducingcostsofthesematerialsandfromprinci

7、paldifferencesofstrainingwerefoundinthetheresolveofscientists,researchersandengineerstocutspecimens.EX-ECAPresultedinhomogeneousmicro-downenergyconsumptionandgreenhousegasemissionsstructurethroughoutthespecimenscrosssectionasearly[1].asafterfourpasses.Ontheotherhand,l

8、aterallyinhomo-Themechanicalandotheressentialpropertiesdeter-geneousmicrostructurewithgradualreductionofgrainminingtheapplic