7074

6616

كارشناسي ارشد

شناسايي و انتخاب مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1390

دوازده، 93ص.: مصور، جدول، نمودار

ص.ع. به فارسي و انگليسي

محمدرضا طرقي نژاد، عباس نجفي زاده

24/7/91

بهزاد نيرومند، احمد رضائيان

1396/09/19

كتابنامه

مواد

مهندسي مواد

ID6616

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

Evaluation the Properties of Nano Stracture Al TiC Composite Fabricated by Accumulative Roll Bonding ARB Process Malek Soltani Kazemi m soltanikazemi@ma iut ac ir March 18 2012 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 ir Dr Abbas Najafizadeh Prof Supervisor E mail a najafi@cc iut ac Abstract In this study at first the effects of different parameters on the bond strength between aluminumstrips have been evaluated Peeling test were used for the evaluation of bond strength betweenaluminum stripes and then for the investigation of fractured surfaces in the samples after peelingtest Optical Microscopy OM and Scanning Electron Microscopy SEM were used After that forthe producing of Aluminum Titanium carbide composite Al TiC three various methods such asAccumulative Roll Bonding ARB cross roll accumulative roll bonding CRARB and ContinualAnnealing and Roll Bonding CAR were used Microstructural variation in the producedcomposites during the various methods was investigated by Optical Microscopy OM In order tothe evaluation of mechanical properties of the produced composites uniaxial tensile test andhardness test were used on the samples In order to the determination of failure mechanism thefractured surfaces of samples were evaluated by scanning electron microscopy after the tensile testof the samples The investigation of texture parameter was performed by the X ray analysis of thesamples For the evaluation of the samples structural parameters such as subgrain size microstrainand so on MAUD software were used The results show that with the increase of thicknessreduction magnitude and the powder grain size the bond strength between aluminum stripesincreases And also with the increase of the powder content between stripes bond strengthdecreases When the cycle s number of process increases the results show that the distribution ofTiC particles in metal matrix is improved and the porosities value and the areas without any bondin the joint of metal layers and the joint of the matrix and the powder grain decrease With theincrease of the process cycles number the tensile strength of the samples increases The strengthincrease magnitude of the samples produced by CRARB method is more than the samplesproduced by ARB method because after 10 process cycles the tensile strength of the samplesproduced by ARB and CRARB methods are respectively 2 1 and 1 52 times more than theannealed Aluminium used as the original raw material The evaluation of the samples fracturedsurfaces shows that the fractured surface of the samples is like shear ductile type The role of shearstress in the failure of the samples produced by CAR method is less and this role is more in thesamples produced by ARB and CRARB methods And also the texture investigation shows that forthe samples produced by CAR method dominant texture is 111 while for the samples producedby ARB dominant textures are 200 and 220 and for the samples produced by CRARB method dominant textures are 200 220 and 311 The grain sizes in the ARB processed and CRARB processed composites after 10 process cycles obtained by MAUD software are equal to 190 nm and147 nm Keywords Metal matrix composite MMC Cold roll bonding Accumulative roll bonding ARB Continual annealing and roll bonding CAR Bond strength و Microstructure Mechanicalproperties Fractography texture parameter electrical resistance Reitveld method

محمدرضا طرقي نژاد، عباس نجفي زاده

بهزاد نيرومند، احمد رضائيان