5221

4891

كارشناسي ارشد

مهندسي مواد

اصفهان: دانشگاه صنعتي اصفهان،دانشكده مواد

1388

نه،115ص.:مصور،جدول،نمودار

ص.ع.به فارسي و انگليسي

فتح ا...كريم زاده،محمد حسين عنايتي

8/3/89

محمدحسين فتحي،علي سعيدي

1396/09/29

كتابنامه

مهندسي مواد

ID4891

به فارسي و انگليسي:قابل رويت در نسخه ديجيتالي

108 Fabrication and characterization of Ti6Al4V Al2O3 nanocomposite by mechanical alloying Amir Mahboubi Soufiani Email address a soofiani@ma iut ac ir Date of Submission 13 March 2010 Department of Materials Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language Farsi Supervisor s Name Fathollah Karimzadeh Associate Professor karimzadeh f@cc iut ac ir Mohammad Hossein Enayati Associate Professor ena78@cc iut ac ir Abstract In the current investigation fabrication and characterization of Ti6Al4V Al2O3 nanocomposite by mechanical alloying has been studied In this regard the Ti6Al4V matrix was fabricated from elemental powders and Ti6Al4V residual scraps Also the nanocomposite was synthesized by mechanochemical reaction of TiO2 Ti Al V powder mixture and mechanical milling of Ti6Al4V scraps together with Al2O3 nanoparticles Phase transformation structural changes and morphological evaluations of powder particles were evaluated by means of X ray diffraction XRD Scanning electron microscope SEM and Thermal analysis DTA The results revealed that in the early stages of mechanical alloying of Ti Al V powder mixture Ti Al hcp solid solution is produced and further milling results in formation of Ti Al V solid solution and amorphous phase Heat treatment of the amorphous and Ti Al V phase eventually led to the fabrication of a nanostructured Ti6Al4V alloy Subjecting the as milled powder to elevated temperature for longer time periods results in crystallization of Ti6Al4V phase and excessive grain growth Moreover in order to compare the properties of final products Ti6Al4V scraps were mechanically milled It was observed that the micro hardness value of nanostructured Ti6Al4V powder produced from elemental powders was significantly higher than that of mechanically milled scraps In situ Ti6Al4V Al2O3 nanocomposite was fabricated by mechanical alloying The nanocomposite was produced gradually during milling and heat treating of TiO2 Ti Al and V powder mixture The crystallization of the amorphous phase and formation of nanostructure Al2O3 phase occurred during milling Mechanical milling of Ti6Al4V scraps with Al2O3 nanoparticles led to production of ex situ Ti6Al4V Al2O3 nanocomposite powder exhibited good thermal stability and high microhardness The physical and

فتح ا...كريم زاده،محمد حسين عنايتي

محمدحسين فتحي،علي سعيدي