نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 استادیار، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران، تهران، ایران
2 دانشجوی دکتری، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران، تهران، ایران
چکیده
در پژوهش حاضر، تأثیر افزودن نانوذرات دی‌بورید تیتانیم (TiB2) بر ریزساختار و خواص کششی کامپوزیت زمینه آلومینیوم 5083 مطالعه و بررسی شد. کامپوزیت‌هایAl5083-TiB2 (با 5 و 10 درصد وزنی تقویت‌کننده)، همراه با افزودنی‌های زیرکونیم (Zr) و اکسید سریم (CeO2)، با درصد‌های مختلف وزنی و به روش ریخته‌گری گردابی، در دمای 1000 درجه سلسیوس، تحت فرایند درجا تولید شدند. سپس نمونه‌ها، به‌منظور توزیع یکنواخت تقویت‌کننده‌ها در زمینه، تحت فرایند اکستروژن گرم قرار گرفتند. نانوذرات TiB2 مورد استفاده در این پژوهش، با روش درجا، به‌وسیله پیش‌ماده‌های کریولیت (Na3AlF6)، اکسید تیتانیم (TiO2) و پتاسیم تترا‌فلورو بوراید (KBF4)، در مذاب آلومینیوم فراوری شد. به‌منظور بررسی ریزساختار، سطوح و سازوکار شکست نمونه‌ها، از آنالیز پراش پرتو ایکس (XRD)، میکروسکوپ نوری (OM) و میکروسکوپ الکترونی روبشی (SEM) استفاده شد. نتایج آزمون کشش نشان داد که افزودن 10 درصد وزنی ذرات TiB2، در مقایسه با نمونه بدون تقویت‌کننده، باعث افزایش 7/17 درصدی استحکام کششی نهایی و کاهش 2/19 درصدی کرنش می‌شود. همچنین، افزودن Zr و CeO2، به‌علت حذف ترکیب بین‌فلزی Al3Ti و سازوکار عدم‌تطابق (ضرایب) انبساط حرارتی با زمینه، در مقایسه با نمونه بدون تقویت‌کننده، باعث افزایش 8/35 درصد استحکام و 78 درصد کرنش نمونه حاوی 10 درصد تقویت‌کننده شد. همچنین، آنیل‌کردن، بعد از مرحله اکستروژن، در نمونه حاوی 10 درصد وزنی TiB2، باعث کاهش استحکام کششی شد.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Investigation on the Microstructure and Tensile Properties of Al5083-TiB2 Nanocomposites Produced by Stir Casting Method
نویسندگان [English]
- Ali Alizadeh 1
- Mehdi Abdollahi Azghan 2
1 Assistant Professor, University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran
2 Ph. D. Student, University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran
چکیده [English]
This study was conducted to investigate the effect of adding titanium diboride (TiB2) nanoparticles on the microstructure and tensile properties of the Al5083 matrix composite. Al5083/TiB2 metal matrix composites (with 5 and 10 wt % reinforcement) along with zirconium (Zr) and cerium oxide (CeO2) additives with different wt % were fabricated by in situ-stir casting at 1000 °C. The samples were then subjected to hot extrusion for uniform distribution of reinforcements in the matrix. TiB2 nanoparticles were in-situ processed in molten aluminum using the precursors such as cryolite (Na3AlF6), titanium oxide (TiO2), and potassium tetrafluoroborate (KBF4). The microstructure, surfaces, and failure mechanism of the samples were investigated using X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM). Tensile test results showed that the addition of 10 wt % TiB2 particles increased the ultimate tensile strength by 17.7 % and decreased the strain by 19.2 % compared to the sample without reinforcement. Besides, the addition of Zr and CeO2 increased the strength by 35.8 % and the strain of the sample containing 78 % by 10 % reinforcement compared to the sample without reinforcement due to the removal of intermetallic compound Al3Ti and the incompatibility between coefficients of thermal expansion (CTE) with the matrix. Also, post-extrusion annealing in the sample with 10 wt % TiB2 reduced the tensile strength.
کلیدواژه‌ها [English]
- Al5083 Alloy
- Titanium Diboride
- Stir Casting
- Hot Extrusion
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