9839

9076

كارشناسي ارشد

شناسايي انتخاب و روش ساخت مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1393

سيزده، 82ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمدرضا طرقي نژاد، احمد رضاييان

94/2/1

محمدحسين عنايتي، ابوذر طاهري زاده

1396/09/26

كتابنامه

مواد

مهندسي مواد

ID9076

83 Effect of strain path on microstructure and mechanical properties of 60 40 alpha brass strip by accumulative roll bonding process Mohammad Mirzaei mohammad mirzaei@ma iut ac ir 18 Jan 2015 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors Mohammad Reza Toroghinejad Prof E mail toroghi@cc iut ac irAhmad Rezaeian Assist Prof E mail a rezaeian@cc iut ac irAbstractsThe aim of the present study was to evaluate the effect of the strain path on microstructureand mechanical properties of a 60 40 alpha brass strip processed by accumulative rollbonding ARB process The brass strips were produced up to 5 cycles through directARB process route A rotation angle of 90 anti clockwise route BC 90 route BA and 180 route C around the normal direction during ARB process To conduct thisstudy the strips with a thickness of 1 mm and dimensions of 6 cm 10 cm were used forthe routes A and C and dimensions of 6 cm 6 cm were utilized for the routes B A and BC The quality of roll bonding produced in different strain paths was determined using opticalmicroscopy The results indicated that for the routes A and C the bonding quality wasimproved with increasing the number of cycles whereas the routes BA and BC resulted inweaker bonding It was also found that the interface bonding in the routes BA BC and Cseemed to have lower quality than that of route A Tensile and hardness tests were alsoperformed on the produced strips The tensile strength and hardness values of the ARBprocessed 60 40 alpha brass strips with different routes was increased about 300 higherthan that of the annealed brass used as the initial material In order to better understandingof the mechanical behavior in different strain paths shear strain distribution across the stripthickness was drawn schematically and compared The results illustrated that the shearstrain was decreased as the rolling direction was altered In addition the crystallite size microstrain and dislocation density were estimated using Rietveld method for all the routesin various ARB cycles The crystallite size was determined to be in the range of 22 32 nmin almost all the routes In order to clarify the failure mode fracture surfaces after thetensile test were studied by scanning electron microscopy Fracture surface observationsshowed that the failure mode in the ARB processed 60 40 alpha brass with in differentroutes was shear ductile rupture with elongated dimples Keywords Severe plastic deformation 60 40 alpha brass tensile strength shear strain

محمدرضا طرقي نژاد، احمد رضاييان

محمدحسين عنايتي، ابوذر طاهري زاده