MaterialsandDesign37(2012)202–210ContentslistsavailableatSciVerseScienceDirectMaterialsandDesignjournalhomepage:www.elsevier.com/locate/matdesMicrostructureandmechanicalpropertiesofthemotorcyclecylinderbodyofAM60Bmagnesiumalloyformedbycombiningdiecastingandforging⇑JufuJianga,YingWangb,,YuanfaLic,WeiweiShanc,ShoujingLuoaaSchoolofMaterialsScienceandEngineering,HarbinInstituteofTechnology,Harbin150001,PRChinabSchoolofMechatronicsEngineering,HarbinInstituteofTechnology,Harbin150001,PRChinacMgTechnology(ShenZhen)Co.Ltd.ofKaShuiGroup,ShenZhen518111,PRChinaarticleinfoabstractArticlehistory:DoublecontrolformingtechnologywasfirstlyproposedformeetingtheproducingrequirementsofReceived8November2011complexMgalloypartswithhighmechanicalproperties.Notonlythehigh-speedfillingbutalsohigh-Accepted6January2012pressuredensifyingandrefiningcouldbeachievedindoublecontrolformingtechnology.AtypicalpartAvailableonline14January2012ofmotorcyclecylinderbodywasusedfordemonstratingitsadvantages.Theresultsshowedthatcom-pletefillingcouldbeachievedbyinjectionsystemofdoublecontrolformingdeviceandthemicrostruc-Keywords:tureofformedpartwasdensifiedandrefinedwellbyitsforgingsystem.HighmechanicalpropertiessuchA.Non-ferrousmetalsandalloysasultimatetensilestrengthof241MPaandelongationof13.9%wereachievedinthepartsformedbyC.Castingdoublecontrolforming.Comparedtodiecasting,theultimatetensilestrengthwasincreasedby63.9%C.Forgingandelongationwasincreasedby3.3times.Alargenumberoffineequiaxedgrainswiththeaveragesizelessthan20lmwerefoundinthemicrostructureofpartsformedbydoublecontrolforming.Arefinedmicrostructurealsoledtoamoreuniformdistributionofprimaryequiaxedgrainsandsecondphase.Castingdefectssuchasshrinkagevoidswereremovedfromthemicrostructureduetotheforgingpressure.Ó2012ElsevierLtd.Allrightsreserved.1.Introductionthealloyandfoundthatfurtherimprovementstothecreepresis-tancewereachievedbyagingthealloypriortocreeptesting.MagnesiumalloyisthelighteststructurematerialwithahighMoreo