بررسی ریزساختار و خواص مکانیکی نانوکامپوزیت A356/SiC تولید شده به روش گردابی اصلاح شده

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشگاه علم و صنعت ایران

2 دانشجوی کارشناسی ارشد، شناسایی و انتخاب مواد، دانشگاه علم و صنعت، تهران، ایران

چکیده

در این تحقیق، تاثیر درصد وزنی نانوذرات سرامیکی بر نحوه‌‌ی توزیع و خواص مکانیکی کامپوزیت مورد بررسی قرار گرفت. به این منظور از نانوذرات SiC با متوسط اندازه ذره 80 نانومتر استفاده شد که با درصدهای وزنی ۰.۵، ۱ و ۱.۵ به مذاب در دمای °∁610 و به روش ریخته‌گری گردابی اصلاح شده به همراه فشار گاز خنثی تزریق شد. بررسی‌های ریزساختاری توسط میکروسکوپ نوری و الکترونی روبشی گسیل میدانی (FESEM) نشان داد که نانوکامپوزیت‌ها از ریزساختار ظریف‌تری نسبت به آلیاژ تقویت نشده برخوردارند به طوری که میانگین انداره بازوهای دندریتی تا 50 درصد کاهش یافته است و توزیع ذرات در زمینه با کاهش درصد وزنی بهبود می‌یابد. بررسی سختی نمونه‌ها توسط سختی سنجی برینل نشان داد که وجود ذرات مقاوم‌ساز موجب افزایش سختی نمونه‌های کامپوزیتی شده و بیشترین سختی مربوط به نمونه با ۰.۵% وزنی از نانوذرات SiC با افزایش 40 درصدی در سختی است. درصد تخلخل نمونه های ریختگی با استفاده از روش ارشمیدس و محاسبه اختلاف چگالی واقعی و ظاهری اندازه‌گیری شد و مشخص شد با افزایش درصد وزنی ذرات SiC از ۰.۵ به ۱.۵ ، حدودا 3% بر میزان تخلخل موجود در نمونه‌ها افزوده می شود.

کلیدواژه‌ها

عنوان مقاله [English]

Investigation of Microstructure and mechanical properties of A356/SiC nanocomposites produced via a modified vortex method

نویسنده [English]

  • Kimiya Enayatmanesh 2
1
2 M.Sc. Student, School of Metallurgy and Materials Engineering, Iran University of Science and Technology
چکیده [English]

In this research, the influence of various weight percentages of reinforcing particles on the microstructure and mechanical properties of composites was investigated. Aluminum alloy (A356) matrix composites reinforced with 0.5, 1 and 1.5 wt. % nano-particle SiC (about 80nm) were fabricated via stir casting method. Fabrication was performed at 610°∁ by the injection of reinforcing particles into molten alloy. The composites were characterized by field emission scanning electron microscope (FESEM) equipped with image analyzer and energy dispersive spectroscopy (EDS) and, Optical microscope (OM). Microstructure evaluation revealed a uniform distribution of nano particles with reduced in weight percentages and the average size of dendritic arms has decreased at least 50 percent. .Brinell hardness measurement showed that addition of reinforcing particles gives rise to hardness compared to matrix alloy and the highest increase was for the sample contain 0.5% SiC with 40 percent increase. The porosity percentage in the materials was calculated according to the difference between the theoretical and measured density and revealed that porosity increased about 3% by increasing in amount of SiC particles.

کلیدواژه‌ها [English]

  • Stir casting
  • Nano-composite
  • Nano SiC
  • Microstructure
  • Hardness

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سابقه مقاله

  • تاریخ دریافت: 03 خرداد 1396
  • تاریخ بازنگری: 23 آبان 1397
  • تاریخ پذیرش: 06 مرداد 1397

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