پديد آورنده :
صارمي، فرهاد
عنوان :
توليد و مشخصه يابي كامپوزيت زمينه آلومينيوم به روش رخنه دهي تحت فشار مذاب درپيش ساخته هاي پوشش داده شده فولادي
مقطع تحصيلي :
كارشناسي ارشد
محل تحصيل :
اصفهان: دانشگاه صنعتي اصفهان، دانشكده مهندسي مواد
صفحه شمار :
ده، 89ص.: مصور، جدول، نمودار
يادداشت :
ص.ع. به فارسي و انگليسي
استاد راهنما :
رحمت الله عمادي
توصيفگر ها :
ريخته گري كوبشي , پوشش الكترولس نيكل -فسفر , خواص فيزيكي و مكانيكي , سايش
تاريخ نمايه سازي :
11/5/91
استاد داور :
محمود مرآتيان، مسعود عطاپور
تاريخ ورود اطلاعات :
1396/09/18
چكيده فارسي :
به فارسي و انگليسي: قابل رويت در نسخه ديجيتالي
چكيده انگليسي :
90 Fabrication and Characterization of Aluminium Based Composite by Squeeze Infiltration of Melt into the Preforms of Coated Steel Fibers Farhad Saremi f sareminaeini@ma iut ac ir November 23 2011 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisor Dr R Emadi remadi@cc iut ac irAbstractDue to their special properties such as high strength good wear resistance low thermal expansioncoefficient and high oxidation resistance aluminum matrix composites have found greatapplications in automobile military and aerospace industries nowadays One of the new methodsfor the manufacturing of aluminum matrix composite materials is the infiltration of the melt intothe metallic preforms through squeeze casting In this research aluminum matrix compositesreinforced with steel fiber preforms were produced through squeeze casting method To preventhazardous chemical reactions between steel fibers and aluminum base and also to increase thewettability of the fibers a Ni P coating was applied on the fibers by electroless process Then steel aluminum composites with different weight percentages of steel fibers were prepared Thesamples were cast at 7500C pouring temperature under 50 75 100 and 125 MPa pressures Then the physical and mechanical properties of the composites containing 3 5 and 7 weight percent ofsteel fibers were studied in contrast to commercial pure aluminum The results showed that by anincrease in squeeze casting pressure from 50 MPa to 125 MPa the porosity percentage of the purealuminum sample reached zero and the specific strength or the ratio of strength to the weight of thecomposite containing 7 weight percent of steel fibers was about twice that of the pure aluminum Also hardness reached 52 Brinell for the composite sample with 7 weight percent of the fibers at125 MPa from 19 Brinell for pure aluminum at 50 MPa Moreover by an increase in the weightpercent of the steel fibers the increased porosity and ductility are reduced To study the tribologybehavior of the samples the wear tests were performed by the pin on disk machine Wear testswere performed in dry conditions and under 1 2 and 3 newton loads at sliding rate of 0 14 m s Torecognize the dominant wear mechanism the contact areas and the wear particles were studied byscanning electron microscope The results obtained from the wear tests showed that the compositesamples with more reinforcement enjoyed higher wear resistance attributed to an increase inresistance to plastic deformation of the composite samples in the presence of reinforcement steelfibers Finally it can be concluded that in applications requiring hardness strength or resistance tohigh wear the use of pure aluminum based composites containing proper weight percent of Ni Pcoated steel fibers is logical and economically justified Keywords Aluminium matrix composite Steel preform Squeeze casting Nickel Phosphorouselectroless plating Physical and mechanical properties Wear
استاد راهنما :
رحمت الله عمادي
استاد داور :
محمود مرآتيان، مسعود عطاپور
