پديد آورنده :
عبداللهي، هادي
عنوان :
توسعه نانو كامپوزيت هيبريدي بر پايه سيستم سه تايي Al-Ni-O بر سطح آلياژ منيزيم AZ31 طي فرايند اصطكاكي اغتشاشي و بررسي مكانيزم تشكيل آن
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مواد
صفحه شمار :
سيزده،94ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
فتح ا.. كريم زاده، محمد حسن عنايتي
توصيفگر ها :
نانو كامپوزيت درجا , نيكل , اكسيد نيكل
تاريخ نمايه سازي :
15/4/92
استاد داور :
محمد حسن عباسي، محمد علي گلعذار
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
97 Development of hybrid surface nanocomposite based on Al Ni O ternary system on AZ31 magnesium alloy surface by friction stir processing and evaluation of it s formation mechanism Hadi Abdollahi Sh abdollahi@ma iut ac ir Date of Submission 2013 01 15 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor F Karimzadeh f karimzadeh@cc iut ac ir M H Enayati ena78@cc iut ac ir Abstract In this research in situ surface nano composites based on Mg Al Ni and Mg Al Ni O alloying systems were produced on AZ31 plate by friction stir processing FSP Then microstructural hardness tensile and wear properties of these specimens were investigated For this purpose Ni and NiO powders were placed into surface grooves and then FSP were done In order to optimize the FSP parameters such as rotation speed and FSP passes microstructural analyses and microhardness test were done The result of microstructural observations on FSPed specimen without Ni and NiO powders indicated that by increasing number of FSP passes grain size decreased from 25 m in base metal to 7 5 and 3 m after 1 and 5 pass process Also characterization of Mg Al Ni nanocomposite microstructure indicated that during 1 pass reinforced particles were non uniform in the matrix So that in this state Ni powder was cold welding and formed coarse Ni particle in the matrix By increasing FSP passes coarse Ni particles were crushed so that after 5 passes more uniform distribution of reinforcement particles were observed in the matrix XRD and EDS analysis were performed to detect created phases during in situ reaction between matrix and Ni powder Results showed that in Mg Al Ni composite that produced during 1 pass FSP Mg2Ni and Al3Ni2 intermetallic compounds were formed By increasing FSP passes the amount of Mg2Ni and Al3Ni2 reduced and AlNi and MgNi2 intermetallic compounds were formed instead of Mg2Ni and Al3Ni2 compounds The microstructure of surface nanocomposite in Mg Al Ni O alloying system indicated that during 3 pass FSP uniform distributions of reinforcement particles obtained Also XRD pattern of this specimen indicated that at the first stage of FSP reaction between Mg and NiO started and MgO and Ni were formed in the microstructure Finally by increasing FSP passes Ni reacted with available aluminum in the matrix therefore Al Ni intermetallic compounds were formed The hardness of base metal Mg Al Ni and Mg Al NiO were 56 106 and 140 Hv respectively The tensile test results indicated that ultimate tensile stress of base metal and Mg Al Ni O composite were 226 and 320 MPa respectively Additionally wear test analysis indicated that wear resistance of Mg Al NiO surface composite is much better than for base metal Keywords Insitu nano composite magnesium Nikel Nikel Oxide Friction Stir Processing PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
فتح ا.. كريم زاده، محمد حسن عنايتي
استاد داور :
محمد حسن عباسي، محمد علي گلعذار
