6925

6467

كارشناسي ارشد

جوشكاري

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مواد

1390

دوازده، 109ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

مرتضي شمعانيان اصفهاني، فخرالدين اشرفي زاده

محمدرضا طرقي نژاد

14/5/91

احمد كرمانپور، مسعود عطاپور

1396/09/18

كتابنامه

مواد

مهندسي مواد

ID6467

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Friction Stir Welding nanostructure Al SiC Composite Manufactured by Accumulative Roll Bonding and Evaluating the Joint Properties Hamidreza Merati h merati@ma iut ac ir March 04 2012 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 IranDegree M Sc Language FarsiDr Morteza Shamanian Assoc Prof Supervisor Email shamanian@cc iut ac irDr Fakhreddin Ashrafizadeh Prof Supervisor Email ashrafif@cc iut ac irDr Mohammad Reza Toroghinejad Assoc Prof Advisor E mail toroghi@cc iut ac irAbstractIn the present study Al 5Vol SiC composite was manufactured by accumulative roll bonding ARB process after 10 cycles Subsequently the composite plates were joined using friction stir welding FSW atthe tool rotation speeds of 900 1120 and 1400 rpm and the welding speeds of 63 80 and 100 mm min Inaddition using 4 pin geometries cylindrical triangular square and hexagonal the effect of pin profiles onmechanical properties of joints were investigated Microstructural evolutions in the Stir Zone SZ of thewelded samples were investigated by Scanning Electron Microscopy SEM A K type thermocouple wasused for monitoring of temperature variation during FSW After 10 ARB cycles the compositemicrostructure showed that the reinforcement particles were distributed uniformly in the Al matrix withoutporosities in the Al Al and Al SiC interfaces Hardness and tensile strength of produced composite were 2 26and 2 5 times as high as that of the annealed pure Aluminum respectively Whereas the elongation of thecomposite was drastically decreased by 22 in comparison to that of the annealed pure Al SEM observationof fracture surfaces showed that the rupture mode in the composite was ductile rupture type The compositewas not joined at 900rpm 100 mm min welding parameter In addition voids were found in SZ of weldsusing welding speeds of 63 and 80 mm min at 900rpm The voids drastically decreased the tensile strength ofjoints obtained at the parameters Using greater rotation speed sufficient heat input was provided for materialflow during FSW and desirable joints were obtained Among the other welding parameters the most tensilestrength and hardness and the lowest elongation were achieved in the joint obtained at 1120rpm 100mm minwelding parameter revolution pitch of 0 089mm r In contrary the least tensile strength and hardness andthe most elongation were achieved in the joint obtained at 1400rpm 80mm min revolution pitch of0 057mm r Fractography of the tensile fracture surfaces of FS welded samples revealed ductile dimpleswhich were grown and deeper at less revolution pitches The microstructure and mechanical properties of theFS welded composite was significantly affected by the tool pin profile The microstructural evaluation of stirzones showed that the most fragmentation and distribution of SiC particles were obtained by square pin Thegreatest hardness tensile strength and elongation were achieved in the joint obtained by square pin Hexagonal pin caused deep voids in SZ by which the tensile properties drastically decreased Keywords Aluminum Accumulative roll bonding Friction stir welding Revolution pitch Heat input Tensile strength

مرتضي شمعانيان اصفهاني، فخرالدين اشرفي زاده

محمدرضا طرقي نژاد

احمد كرمانپور، مسعود عطاپور