پديد آورنده :
قطبي ورزنه، علي
عنوان :
ساخت و بررسي ويژگي هاي ساختاري و مغناطيسي آلياژ حافظه پذير فرومغناطيسي Ni47Mn40Sn13 نانو ساختار
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده فيزيك
صفحه شمار :
چهارده،106ص.: مصور،جدول،نمودار
يادداشت :
ص.ع.به فارسي و انگليسي
استاد راهنما :
پرويز كاملي
استاد مشاور :
فتح ا... كريم زاده
توصيفگر ها :
آسياب كاري , بازپخت , اثر مغناطو گرمايي
تاريخ نمايه سازي :
7/12/92
استاد داور :
محمود كدخدايي، مهدي رنجبر
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
Investigation of structural and magnetic properties of nanostructured Ni47Mn40Sn13 ferromagnetic shape memory alloy Prepared by Mechanical alloying Ali Ghotbi varzaneh a ghotbi@ph iut ac ir Date of Submission 2014 01 15 Department of physics Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor P Kameli kameli@cc iut ac ir Abstract In this thesis an attempt has been made to synthesis the nanostructured Ni47Mn40Sn13 ferromagnetic shape memory alloy by using mechanical alloying Milling of Ni Mn and Sn powders was carried out in planetary ball mill for 20 hours The structure and magnetic evaluation of samples were investigated by X ray diffraction Dc magnetization and AC susceptibility measurements Rietveld analysis indicates 20 hours milled sample has a L21 phase In this sample the martensitic transformation MT was not observed This is basically due to the atomic disorder and large lattice strain of nanoparticles As milled powder samples were sealed in the quartz tubes under high vacuum and subjected to heat treatments at 550 C 750 C and 950 C for 16 hours followed by rapid quenching in ice water mixture In samples annealed in 550 C and 750 C minor additional peaks in the diffraction pattern was observed In the sample that annealed at 550 C martensitic transformation not founded because this sample has the critical lattice parameter It should be emphasize that the MT was seen in other the annealed samples The obtained results show that the MT of Ni Mn Sn alloy can be modified by changing the heat treatment process In addition magnetocaloric effect MCE of sample annealed at 950 C was investigated by M H measurements Difference between saturated magnetization of austenite and martensite phase cause large magnetic entropy change around martensitic transformation The measurements show that this alloy has a good MCE Therefore it will be an appropriate candidate for magnetic refrigerant Keywords Ferromagnetic shape memory alloy mechanical alloying annealing magnetocaloric effect PDF created with pdfFactory trial version www pdffactory com
استاد راهنما :
پرويز كاملي
استاد مشاور :
فتح ا... كريم زاده
استاد داور :
محمود كدخدايي، مهدي رنجبر
