5480

5140

كارشناسي ارشد

شناسايي و انتخاب مواد

اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد

1389

نه،129ص.: مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

فتح الله كريم زاده، محمد حسين عنايتي

25/7/89

مهدي صالحي، محمد علي گلعذار

مهندسي مواد

ID5140

به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي

130 Development of Al Al2O3 surface nanocomposite on Al2024 by friction stir processing evaluation of it s tribological behavior Babak Zahmatkesh b zahmatkesh@ma iut ac ir Date of Submission 2010 04 14 Department of Materials and Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor Fatholah Karimzadeh Associate Professor f karimzadeh@cc iut ac ir Mohammad Hossein Enayati Associate Professor ena78@cc iut ac ir Abstract In this thesis Friction Stir Processing FSP was used to develop surface Al Al2O3 nanocomposite on Al2024 plate A new procedure was introduced for applying the reinforcement particles in which 10 volume percent of Al2O3 nanopowder as the reinforcement was added to the aluminum powder and milled for 1 hour Composite powder was applied on Al2024 plate by atmosphere plasma spray and then the FSP was performed on the plate In order to optimize the FSP parameters microstructural and hardness evaluation were done Optimized parameters including tool design rotational speed linear speed and tilt angle were determined to be 800 rpm 25 mm min and 30 respectively Microstructural evaluation was performed by optical microscopy and Image Tool software In order to examine the effects of the FSP process on hardness and wear behavior hardness and wear tests were performed on base metal and FSPed samples Dominating wear mechanisms were investigated by surface examination and studying of wear product using scanning electron microscopy SEM The thickness of nanocomposite layer produced by FSP was measured to be 600 m in which uniform distribution of Al2O3 particles with good bonding with substrate were observed Microstructural evaluation showed that FSP process significantly reduces the grain size in nugget zone from 250 m base metal to 2 5 m Maximum hardness of base metal FSPed sample without Al2O3 and FSPed nanocomposite were measured to be 90 110 and 230 HV respectively Wear test results showed improved wear resistance in FSPed and nanocomposite samples Wear rate of base metal FSPed sample and FSPed nanocomposite were 0 037 0 027 and 0 004 mgr m respectively Keywords Surface Al Al2O3 nanocomposite Al2024 alloy Friction Stir Processing Microstructure Wear behavior

فتح الله كريم زاده، محمد حسين عنايتي

مهدي صالحي، محمد علي گلعذار