11441

10517

كارشناسي ارشد

شناسايي و انتخاب و روش ساخت مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مواد

1395

دوازده، 74ص.: مصور

فتح الله كريم زاده، احمد رضائيان

محمود منيرواقفي، ابوذر طاهري زاده

1395/05/30

مهندسي مواد

ID10517

Development of Nanostructured Ultra Fine Grained 5083 Aluminum Alloy Produced by Cryogenic Rolling Process and Evaluation of its properties Hamed Heydari Hamed heidari@ma iut ac ir Department of Materials Engineering Isfahan university of Technology 84156 83111 Isfahan Iran Degree M Sc Language FarsiSupervisors Dr Fathallah Karimzadeh Prof E mail karimzadeh f@cc iut ac irDr Ahmad Rezaeian assist Prof Email a rezaeian@cc iut ac irAbstract In the present study 5083 Aluminum alloy was subjected to cryogenic rolling process The mainobjective was optimization of structure and mechanical properties of a 5083Al alloy For this purpose parameters such as strain and temperature of final annealing treatment were evaluated After solidsolution treatment at 510 degC for 2 hrs the specimens were subjected to rolling up to 35 60 and85 reduction at cryogenic temperature Then for improving the strength and ductility they weresubjected to annealing treatment to determine the optimal temperature and time Microstructuralstudies were investigated by using Scanning electron microscopy SEM and optical microscopy Vickers hardness and tensile testing were performed at room temperature to evaluate the mechanicalproperties Dislocation density was also calculated by XRD tests It was found that solution treatment rolling up to 85 reduction and final annealing at 180 degC for 1 hrs are the optimized parameters By applying these parameters the hardness of 121 Hv ultimate tensile strength of 460 MPa andductility of 10 tensile elongation was achieved Results showed that the low temperature incryogenic rolling prevented the dynamic recovery during deformation Therefore a high density ofdislocation will remain which can act as a potential recrystallization sites for Al3Mg2 phaseprecipitates in final annealing step By this process a good combination of strength and ductility wasachieved in 5083 Aluminum alloy Keywords cryorolling 5083 Aluminum Alloy ultrafine grain nanostructure mechanical properties

فتح الله كريم زاده، احمد رضائيان

محمود منيرواقفي، ابوذر طاهري زاده