نوع مقاله: مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، مهندسی ریخته‌گری، دانشگاه علم و صنعت ایران، تهران، ایران

2 دانشیار، مهندسی مواد، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

در این مقاله فصل مشترک کامپوزیت ریختگی دوفلزی آلومینیم-چدن خاکستری بررسی شده است. برای دستیابی به یک محصول دو فلزی مناسب و قابل قبول از دو فلز، بررسی مشخصات فصل مشترک آن‌ها ضروری به‌نظر می‌رسد. ریخته‌گری به روش ثقلی انجام شده است. به این منظور مذاب آلومینیم در دماهای 700 و 750 درجه سلسیوس پیرامون مغزه‌های چدن خاکستری درون حفره‌های استوانه‌ای قالب با نسبت حجمی 3، 5 و 8 ریخته‌گری شد. مطالعات بعدی توسط میکروسکوپی نوری، میکروسکوپ الکترونی روبشی (SEM) و طیف‌سنجی تفکیک انرژی (EDS) نشان از تشکیل لایه‌ی ترکیب بین قلزی در فصل مشترک دو فلز داشت. این لایه از ترکیب بین فلزی Fe2Al5 تشکیل یافته است که بر ناهمواری‌های روی سطح مغزه جامد چدن جوانه می‌زند. بررسی‌های ریزساختاری نشان می‌دهند که افزایش دمای بارریزی و نسبت حجمی مذاب/جامد سبب تشکیل لایه‌های ضخیم‌‌تر و یکنواخت‌تر از ترکیب بین‌فلزی می‌شوند. ریز سختی فاز بین فلزی برابر 824 سختی ویکرز به‌دست آمد. پهنای لایه‌ی واکنش از 5 میکرومتر برای نمونه‌ی ریخته شده در دمای 700 درجه سانتیگراد و نسبت حجمی 3 تا 20 میکرومتر برای نمونه ریخته شد در دمای 750 درجه سلسیوس و نسبت حجمی 8 متفاوت بود. در این تحقیق مکانیسمی برای رشد و جوانه‌زنی این فاز بین فلزی در فصل مشترک دوفلزی پیشنهاد شده است. همچنین نحوه حل شدن فاز زمینه چدن در آلومینیم مذاب و دربرگیری گرافیت موجود در چدن خاکستری در مذاب آلومینیم نشان داده شده است.

کلیدواژه‌ها

عنوان مقاله [English]

Interface characterization of Al/cast iron composite

نویسندگان [English]

  • Mehdi Akbarifar 1
  • Mehdi Divandari 2

1 School of Material Engineering, Iran University of Science and Technology, Tehran, Iran

2 School of Material Engineering, Iran University of Science and Technology, Tehran, Iran

چکیده [English]

In this article, interface characteristics of aluminum and cast iron bimetal has been investigated. To reach an acceptable composite products, from two materials, interface characteristics needs to be investigated. Aluminum melt was poured, at 700 and 750 ̊C, around cylindrical cast iron bars having melt/solid volume ratios of 3, 5 and 8, respectively. Optical and SEM microscopic observations showed that a reaction layer may form at the interface. This layer is composed of Fe2Al5 intermetallic which forms initially at the rough surface of the insert after making contact with molten metal. Microstructural analysis showed the increasing of temperature and the Vm/Vs ratio leads to formation of a thicker and more uniform intermetallic layer. Microhardness of the Fe2Al5 was 824 HV and the thickness of interaction layer varied from 5μm, for the sample produced at 700 ̊C and 3 Vm/Vs, up to 20μm for the sample poured at 750 ̊C and 8 Vm/Vs. A mechanism is suggested for nucleation and growth of this intermetallic layer and also graphite engulfment of gray cast iron, by aluminum melt, at the interface of two metals.

کلیدواژه‌ها [English]

  • Aluminum
  • Cast Iron
  • interface
  • Intermetallic Compound
  • Graphite

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