بررسی رفتار مکانیکی کامپوزیت‌ Al A356- B4C/TiB2 تولیدشده به روش ریخته‌گری گردابی

نوع مقاله : علمی و پژوهشی

نویسندگان

• علی علیزاده ¹
• مهدی عبدالهی ²

¹ مهندسی مواد، دانشگاه صنعتی مالک اشتر، تهران، تهران، ایران

² دانشجوی دکتری، مجتمع دانشگاهی مواد و فناوریهای ساخت، دانشگاه صنعتی مالک اشتر، تهرا ن، تهران، ایرا ن

10.22067/jmme.2022.74511.1037

چکیده

در تحقیق حاضر، تاثیر افزودن میکروذرات کاربید بور (B4C) و نانوذرات دی‌بورید تیتانیم (TiB2) بر ریزساختار، استحکام کششی و سختی کامپوزیت زمینه آلومینیوم A356 مورد مطالعه قرار گرفت. تقویت‌کننده‌ B4C با درصدهای حجمی 5/2، 5 و 5/7 و تقویت‌کننده TiB2 با %5/2 حجمی به روش ریخته‌گری گردابی در دمای C° 1000 تحت فرآیند درجا به زمینه اضافه شدند. نانوذرات TiB2 با روش درجا به‌وسیله پیش مواد کریولیت (Na3AlF6) و اکسید تیتانیم (TiO2) و پتاسیم تترا فلورو بوراید (KBF4) در مذاب آلومینیوم فرآوری شد و میکروذرات B4C بصورت مستقیم وارد مذاب شد. به‌منظور بررسی ریزساختار و فرایند شکست، از آنالیز پراش اشعه ایکس (XRD)، میکروسکوپ نوری (OM) و میکروسکوپ الکترونی روبشی (SEM) استفاده شد. همچنین از آزمون کشش و سختی به منظور بررسی رفتار مکانیکی کامپوزیت‌ استفاده شد. نتایج نشان داد افزودن B4C ابتدا باعث کاهش و سپس باعث افزایش استحکام کششی نهایی نسبت به نمونه بدون تقویت‌کننده شد. همچنین، بیشترین میزان استحکام کششی مربوط به نمونه حاوی %5/2 حجمی B4C و %5/2 حجمی TiB2 است که نسبت به نمونه بدون تقویت‌کننده 235 درصد بهبود نشان داد. اما استحکام کششی نمونه حاوی فقط %5/2 حجمی B4C نسبت به نمونه بدون تقویت‌کننده 35 درصد کاهش یافت. نتایج حاصل از آزمون سختی افت خواص در کامپوزیت حاوی %5/2 حجمی B4C را نشان داد. بیشترین بهبود سختی نیز مانند استحکام کششی در نمونه حاوی %5/2 حجمی B4C و %5/2 حجمی TiB2 بود که در مقایسه با نمونه بدون تقویت‌کننده 33 درصد افزایش پیدا کرد.

کلیدواژه‌ها

• آلومینیوم A356
• دی‌بورید تیتانیم
• کاربید بور
• ریخته‌گری گردابی

20.1001.1.20087462.1401.33.2.4.4

موضوعات

• مواد پیشرفته

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عنوان مقاله [English]

Investigating Mechanical Behavior of Al A356-B4C / TiB2 Composite Produced by Stir Casting

نویسندگان [English]

• Ali Aliadeh ¹
• mehdi abdollahi ²

¹ University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran

² University Complex of Materials and Manufacturing Technologies, Malek Ashtar University of Technology (MUT), Tehran, Tehran, Iran

چکیده [English]

This study investigated the effect of adding boron carbide microparticles (B4C) and titanium diboride nanoparticles (TiB2) on the microstructure, tensile strength, and hardness of A356 aluminum composite. In so doing, 2.5, 5, and 7.5 vol.% B4C reinforcements and 2.5 vol.% TiB2 reinforcement were added to the field by stir casting at 1000 °C using in situ process. The TiB2 nanoparticles were processed in situ by cryolite precursors (Na3AlF6), titanium oxide (TiO2), and potassium tetrafluoroborate (KBF4) in aluminum melt, and B4C microparticles were added directly into the melt. X-ray diffraction (XRD), optical microscope (OM), and scanning electron microscope (SEM) were used to investigate the microstructure and failure mechanism of the samples. Also, hardness and tensile tests were carried out to test mechanical properties. The results showed that addition of B4C first decreased and then increased the ultimate tensile strength compared to the sample without reinforcement. Moreover, the highest value of tensile strength was for the sample containing 2.5 vol.% of B4C and 2.5 vol.% TiB2, which showed a 235% improvement compared to the sample without an amplifier. However, the tensile strength of the sample containing 2.5 vol.% of B4C was reduced by 35% compared to the sample without reinforcement. The results of the hardness test showed a drop in properties of the samples containing 2.5% of B4C reinforcement. the highest value of tensile strength was for the sample containing 2.5 vol.% of B4C and 2.5 vol.% TiB2, which showed a 33% improvement compared to the sample without reinforcement.

کلیدواژه‌ها [English]

• Al A356
• titanium diboride
• boron carbide
• Stir Casting

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