پديد آورنده :
كردي، مهتاب
عنوان :
توسعه آلياژ مس فوق ريزدانه / نانو ساختار با استفاده از نورد تبريدي و ارزيابي خواص آن
مقطع تحصيلي :
كارشناسي ارشد
گرايش تحصيلي :
شناسايي انتخاب و روش ساخت مواد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان ، دانشكده مهندسي مواد
صفحه شمار :
سيزده، 60ص.: مصور، جدول، نمودار
استاد راهنما :
فتح اله كريم زاده، احمد رضاييان
توصيفگر ها :
مس خالص , ريز ساختار , استحكام و انعطاف پذيري
تاريخ نمايه سازي :
1394/07/01
استاد داور :
محمدعلي گلعذار، محمدحسين عنايتي
تاريخ ورود اطلاعات :
1396/10/04
چكيده فارسي :
به فارسي و انگليسي
چكيده انگليسي :
Development of ultrafine grained nanostructure bimodal copper alloy via cryogenic rolling process and evaluation of its properties Mahtab Kordi mahtab kordi@ma iut ac ir 7 July 2015 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiSupervisors Fathollah Karimzadeh Assoc Prof Email karimzadeh f@cc iut ac irAhmad Rezaeian Assis Prof Email a rezaeian@cc iut ac irAbstractIn this study pure copper was subjected to rolling at liquid nitrogen and room temperature The main objective was optimization of strength and ductility of a commercial pure copper For this purpose parameters such as strain temperature and time of annealing aftercryorolling process was evaluated and optimized Standard metallography practices as well asmechanical tests were performed on the samples The tensile test indicated that tensilestrength of 95 sample were 410 Mpa and 245 Mpa for cryorolled and cold rolled at roomtemperature respectively Dislocation density was also calculated by MAUD method It wasrevealed that in the case of cryorolling sample it was almost 1000 times more than that of theone rolled at room temperature The samples which were cryorolled to reductions of 85 and95 were subsequently annealed based on a DTA test at temperatures from 300 C to 400 C It was found that 95 cryorolling and 15 minutes holding at 350 degC after rolling led in theoptimized properties Ultimate tensile strength was increased to 350 Mpa almost 145 Mpamore than that of the as received pure copper while 25 elongation to failure was achieved Optical microscopy and also SEM studies for the mentioned sample showed presence ofnarrow annealing twins In addition an abnormal increase in hardness after annealing andincreased micro strain microstructure during annealing at the above temperature confirmedthe possibility of a bimodal microstructure generation Failure to reduce the dislocationdensity and untwining reactions could be contributed to the above observation Keywords Cryorolling pure copper bimodal structure
استاد راهنما :
فتح اله كريم زاده، احمد رضاييان
استاد داور :
محمدعلي گلعذار، محمدحسين عنايتي
