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Abstract
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This studywasdoneinordertocomparethemicrostructureandmechanicalpropertiesoffrictionstir
welded singleanddoublephasebrassalloys.Themicrostructureofthejointswereexaminedusing
optical microscope,scanningelectronmicroscope(SEM),scanningtransmissionelectronmicroscope
(STEM), andX-raydiffraction.Furthermore,tensiletestandfractographywereappliedtoevaluatethe
mechanical propertiesofthejoints.Theresultsshowedthatthegrainsizeofthestirzoneinthedouble
phase jointwassmallerthanthatofthesinglephasealloy.Incomparisonwithbasemetals,bothofthe
joints containedhighdensityofdislocationswithaqualitativelysimilartexture.However,thedislocation
density ofthedoublephasejointwassomewhatlowerthanthatofthesinglephaseone.Moreover,the
joints hadhighertensilestrength,lowerelongationandlessductilefracturecomparedtotheirbase
metals duetotheir finer grainsizeandhigherdislocationdensity.Thedoublephasejointhadhigher
strength andlowerelongationthansinglephasejointduetotheeffectofthesecondphase.
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