6729

6280

كارشناسي ارشد

شناسايي و انتخاب مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1390

سيزده، 94ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمدرضا طرقي نژاد

1/3/91

عباس نجفي زاده، احمد رضائيان

1396/10/06

كتابنامه

مواد

مهندسي مواد

ID6280

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Characterization of Fine Grained Cu TiC Composite Produced by Accumulative Roll Bonding ARB Mohammad Bakhshian Bafrani m bakhshianbafrani@ma iut ac ir February 13 2011 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiDr Mohammad Reza Toroghinejad Assoc Prof Supervisor E mail toroghi@cc iut ac irAbstractIn this study rolling processes for producing the copper titanium carbide composite were used for firsttime In general two major methods for producing the composites were used a Continual Annealing andRoll Bonding CAR process and b Accumulative Roll Bonding ARB process Effective parameters onbond strength of strips were evaluated by peeling test Microstructural observations during CAR and ARBprocesses were investigated by optical microscopy In order to investigate of mechanical properties of theproduced composites tensile and hardness tests were used Evaluation of fractured surfaces was carried outby scanning electron microscopy SEM Investigation of texture parameter was performed by X rayanalysis Electrical resistance of samples was measured by four probes instrument In order to determine thegrain size of samples produced by CAR and ARB processes metallography and MAUD software wereused The obtained results from peeling test showed that sticking and bounding strength between copperlayers increases with increase in thickness reduction This increase is not related to presense of TiC powderbetween copper layers In 85 thickness reduction because of high bonding strength between layers fracture is not occurred in interface of layers Microscopic observation show that tearing occurred inside ofcopper layers Also the bonding strength increases with increase in TiC particle size and decrease in addedpowder content between copper layers The drived results from composite production by both CAR andARB methods revealed that when the number of cycles was increased porosities were decreased and thedistribution of TiC particles in the copper matrix was improved Also tensile strength of the compositesproduced by ARB method improved by 2 6 times compared to that of the annealed copper as the rawmaterial while the elongation reduced to 11 39 The tensile strength of Cu 2 TiC composite and copperlayer without reinforcement particles that have been produced by ARB method after 10th cycle are obtained321 and 232 MPa respectively The tensile strength of composite manufactured by CAR is 1 7 times higherthan anealed copper The elongation of this composite was obtained about 40 The tensile strength of thecomposites produced by both method was increased by increasing the number of cycles Finally the SEMobservations were revealed that the failure mode of ARB processed composites was shear ductile rupturetype Texture parameter investigation was indicated that for samples produced by CAR process dominanttexture was 111 while for samples produced by ARB process it was 200 and 220 this aspectdemonstrated that it is increased the shear stress to initiate of deformation as a result the strength increases Electrical resistance of the composites produced by CAR and ARB was equal to 61 and 68 m The grainsize of copper and composite produced by CAR process was 70 and 40 m respectively after tenth cycle while in the ARB process it was 98 and 87 nm Keywords Metal matrix composite MMC Continual annealing and roll bonding CAR Accumulative roll bonding ARB Bond strength Microstructure Mechanicalproperties Fractography Texture parameter Electrical resistance Reitveld method

محمدرضا طرقي نژاد

عباس نجفي زاده، احمد رضائيان