Evaluation of microstructure and mechanical properties of bulk nanostructured Ti۵Si۳ and Ti۵Si۳-Al۲O۳ nanocomposite
محل انتشار: مجله سرامیک های پیشرفته، دوره: 3، شماره: 1
سال انتشار: 1396
نوع سند: مقاله ژورنالی
زبان: انگلیسی
مشاهده: 184
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شناسه ملی سند علمی:
JR_ACERPT-3-1_001
تاریخ نمایه سازی: 11 اردیبهشت 1400
چکیده مقاله:
Mechanical alloying and vacuum sintering have been used to produce bulk nanostructured Ti۵Si۳ and Ti۵Si۳-۱۵Wt.% Al۲O۳ nanocomposite. X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) were used to study the microstructural characteristics of the samples. Indentation method was used to calculate hardness, elastic modulus and fracture toughness of bulk samples. The results showed that the nanometric grains were obtained through mechanical alloying and remained in nanometric scale after subsequent sintering. It was also observed that the in-situ produced Al۲O۳ through mechanochemical reaction has amorphous structure which crystallized during sintering process. Nanohardness, elastic modulus and fracture toughness of Ti۵Si۳-۱۵Wt.% Al۲O۳ nanocomposite were calculated as ۱۶۶۰ HV, ۲۳۸ GPa and ۵.۵ MPa.m۱/۲ that is higher than monolithic Ti۵Si۳ and other Ti۵Si۳-based nanocomposites. Toughening mechanisms based on crack deflection and crack bridging were suggested as responsible factors for fracture toughness increase Ti۵Si۳/Al۲O۳ nanocomposite.
کلیدواژه ها:
نویسندگان
Soheil Sabooni
Department of Materials Engineering, Isfahan University of Technology
Fathallah Karimzadeh
Department of Materials Engineering, Isfahan University of Technology
M. H. Abbasi
Department of Materials Engineering , Isfahan University of Technology
Mohammad Hossein Enayati
Department of Materials Engineering, Isfahan University of Technology