علوم و فناوری کامپوزیت

مطالعة ریزساختاری و بررسی خواص مکانیکی نانوکامپوزیت "آلومینیوم خالص-گرافن" با استفاده از روش آسیاب گلوله‌ای در فرآیند ریخته‌گری با همزنی مکانیکی - مغناطیسی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، مهندسی مکانیک، دانشگاه شهید بهشتی، تهرا ن.

2 دانشیار، مهندسی مکانیک، دانشگاه شهید بهشتی، تهران.

3 دانشیار، مهندسی مکانیک، دانشگاه علم و صنعت، تهران.

چکیده

در پژوهش‌های اخیر، استفاده از گرافن به دلیل تأثیر مثبت بر خواص کامپوزیت‌ها از جمله خواص مکانیکی، الکتریکی و حرارتی مورد توجه قرار گرفته است. در این پژوهش، خواص ریزساختاری و مکانیکی نانوکامپوزیت ریختگی آلومینیوم خالص تقویت شده با 0.5درصد وزنی گرافن با همزنی مکانیکی - الکترومغناطیسی و سپس اکستروژن داغ و نهایتا آنیل، در دو روشِ استفاده از آسیاب گلوله‌ای و بدون استفاده از آسیاب گلوله‌ای بررسی شد. با بکار بردن روش‌های همزنی مکانیکی و الکترومغناطیسی، ترکیب‌ دو نیروی برشی و حجمی، تلاطم بیشتری را در فلز مذاب ایجاد کرده که منجر به توزیع مناسب ذرات تقویت کننده، کاهش ساختارهای دندریتی و اصلاح اندازه دانه در طول انجماد می‌شود. مطالعات ریزساختاری نشان داد که در روش آسیاب گلوله‌ای توزیع نانو ذرات گرافن در فاز زمینه و کاهش اندازه دانه، نسبت به روش بدون آسیاب گلوله‌ای مطلوب‌تر می‌باشد. در روش آسیاب گلوله‌ای، سختی، استحکام کششی و استحکام فشاری به ترتیب 19.7، 142.8 و 11.7 درصد و در روش بدون آسیاب به ترتیب 9، 85.2 و 13.5 درصد نسبت به آلومینیوم خالص افزایش یافته است. تغییر طول در روش آسیاب گلوله‌ای 6.8 و در روش بدون آسیاب گلوله‌ای 35.4 درصد کاهش نشان می‌دهد.

کلیدواژه‌ها

عنوان مقاله [English]

Study of microstructure and investigation of mechanical properties of pure aluminum-graphene nanocomposite using ball mill method in casting process with mechanical and electromagnetic stirring

نویسندگان [English]

  • Zahra Azizi 1
  • Khosrow Rahmani 2
  • Fathollah Taheri-Behrooz 3

1 Mechanical and Energy Systems Engineering, Shahid Beheshti University, Tehran, Iran.

2 Mechanical and Energy Systems Engineering, Shahid Beheshti University, Tehran, Iran.

3 School of Mechanical Engineering, University of Science and Technology, Tehran, Iran.

چکیده [English]

In recent scientific studies, the use of graphene has been considered due to its positive effect on the properties of composites, including mechanical, electrical and thermal properties. In this research, the microstructural and mechanical properties of pure aluminum nanocomposite cast reinforced with 0.5 wt% graphene with mechanical-electromagnetic stirrer and then hot extrusion and finally annealing, in two methods of using ball milling and without using ball milling process, was investigated. By applying both mechanical and electromagnetic stirring techniques, combining both shear and body forces can cause more turbulence in the molten metal that lead to as well as distribute reinforcing particles, decreasing the dendritic structures and refining the grains during solidification. The microstructural studies showed that in the ball mill method, the distribution of graphene nanoparticles and reduce grain size in the matrix phase is significantly better than the non-ball mill method. Also, in the method of ball mill, hardness, tensile strength and compressive strength increased by 19.7, 142.8 and 11.7%, respectively, and in the method without mill, 9, 85.2 and 13.5%, respectively, compared to pure aluminum. The elongation decreased by 6.8% in the ball mill method and 35.4% in the non-ball mill method.

کلیدواژه‌ها [English]

  • Casting nanocomposite
  • Pure aluminum
  • Graphene
  • Ball Milling
  • Mechanical and Electromagnetic Stirring
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علوم و فناوری کامپوزیت
دوره 8، شماره 2
شهریور 1400
صفحه 1532-1542
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