علوم و فناوری کامپوزیت

علوم و فناوری کامپوزیت

ساخت و ارزیابی خواص مکانیکی کامپوزیت درجا AA5083/TiB2 به روش ریخته‌گری گردابی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشیار، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران.
2 دانشجوی دکتری، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران.
3 دانش‌آموخته کارشناسی ارشد، مجتمع دانشگاهی مواد و فناوری‌های سـاخت، دانشــگاه صــنعتی مالــک اشــتر، تهــران.
4 استاد، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران.
چکیده
هدف از این پژوهش ساخت و بررسی خواص مکانیکی کامپوزیت درجا AA5083/TiB2 تولید شده به‌وسیله فرآیند ریخته‌گری گردابی بود. به همین منظور، کامپوزیت‌هایی با 2%، 4% و 6% وزنی ذرات TiB2تولید و با آلیاژ آلومینیوم 5083 فاقد ذرات ‌ (TiB2) مقایسه شدند. در این پژوهش ابتدا به‌منظور پاک‌سازی ناخالصی‌ها، آلودگی‌های سطحی و مولکول‌های آب موجود در پودرهای TiO2 و B2O3، عملیات پیش‌گرم کردن بر روی آن‌ها انجام شد. سپس عملیات آسیاکاری با سرعت 750 دور بر دقیقه به مدت 15 ساعت، به‌منظور فعال‌سازی مکانیکی پودرها و ایجاد فازهای واسطه که منجر به تشکیل فاز نهایی (TiB2) در حین فرآیند ریخته‌گری می‌شود، انجام شد. پس از آماده‌سازی پودرها، آن‌ها با نسبت استوکیومتری مشخص با هدف دستیابی به مقادیر 2%، 4% و 6% وزنی ذرات TiB2 به مذاب آلیاژ آلومینیوم 5083 اضافه شدند و بعد از هم‌زدن با سرعت 350 دور بر دقیقه به مدت 15 دقیقه، ریخته‌گری انجام شد. در پایان به‌منظور بهبود خواص قطعات ریخته‌گری شده از فرآیند اکستروژن گرم استفاده شد. سپس با استفاده از آنالیز فازی (XRD)، آنالیز میکرو ساختارOM) و SEM) و آزمون‌های کشش، سختی و دانسیته تولید یا عدم تولید، توزیع ذرات تقویت‌کننده‌ و خواص مکانیکی نمونه‌ها مورد بررسی قرار داده شدند. نتایج به‌دست آمده نشان‌دهنده‌ی بهبود خواص مکانیکی نمونه‌ها با افزایش ذرات TiB2 تا مقدار 4% وزنی پس از عملیات تکمیلی بود. به‌طوری‌که بیشترین استحکام کششی و سختی، و کمترین درصد ازدیاد طول نسبی در نمونه ریخته‌گری و اکسترود شده (در دمای oC 330) AA5083/4Wt.%TiB2 به‌دست آمد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Fabrication and mechanical properties of AA5083/TiB2 in situ Composite by stir casting process

نویسندگان English

Ali Alizadeh 1
Mohsen Heydari Beni 2
Amin Rezaei 3
Jafar Eskandari Jam 4
1 Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
2 Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
3 Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
4 Faculty of Materials and Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
چکیده English

The Purpose of this study is fabrication aluminum matrix composites reinforced with TiB2 in situ ceramic particles by the stir casting process. So, produce composites with 2%, 4% and 6 wt% and contrast with AA5083 alloy of reinforcing particles without. In this study, in order to impurities and surface contamination cleanse and also water molecules contained in the powders of TiO2 and B2O3, preheating operation performed on them. Then milling operation done with speed 750 Rpm for 15 hours, in order to mechanical activation and prevent performed of adverse reactions between the powders in during the casting process. After preparing the powders, they are stoichiometric determined ratio to achieve values of 2%, 4% and 6wt% TiB2 phase were added to the AA5083 alloy molten and after stirring for 15 minutes with speed 350 Rpm, the casting was performed. At the end of in order to properties improve of casting specimens from used hot extrusion process. Then, using phase analysis (XRD), microstructure analysis (OM and SEM) and tensile, hardness and density tests, production or non-production, distribution of reinforcing particles and mechanical properties investigated of samples. The ultimate goal of this research is, using a combined method to problems solve of cast aluminum matrix composites and improving their properties. The results showed an improvement in mechanical properties of samples with increasing reinforcing particles up to 4wt% after completion treatment. As the highest tensile strength and hardness obtained at cast and extruded sample (at temperature of 330 ° C) AA5083/4% TiB2.

کلیدواژه‌ها English

In situ metal matrix composite
titanium diboride (TiB2)
vortex casting
hot extrusion
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