نوع مقاله: مقاله پژوهشی

نویسندگان

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

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

چکیده

در این تحقیق فصل مشترک دو فلزی آلومینیم- برنج، تولید شده با دستگاه ریخته‌گری گریز از مرکز عمودی، مورد بررسی متالورژیکی قرار گرفت. ابتدا بوش‌های برنجی در محدوده دمایی 100-300 درجه‌ی سلسیوس پیش‌گرم شده و سپس مذاب آلومینیم با نسبت حجمی 5/1 برابر جامد برنجی درون بوش‌های درحال دوران با سرعت 800، 1600 و 2000 دور بر دقیقه ریخته‌گری شد. نمونه‌های حاصله به ازای متغیرهای مختلف، با استفاده از میکروسکوپ نوری (OM)، میکروسکوپ الکتررونی (SEM) مجهز به حسگر طیف‌سنجی پراش انرژی پرتو ایکس (EDS) و نرم افزار Image J بررسی شد. تشکیل اتصال متالورژیکی در این تحقیق، می‌تواند ناشی از شرایط انحلالی ویژه‌ای باشد که توسط نیروهای چندگانه مکانیکی دخیل و همچنین نفوذ در انتهای فرآیند انجماد تامین می‌شود. مطالعه طیف‌سنجی نشان می دهد که لایه‌های تشکیل شده در این دوفلزی، به ترتیب از سمت برنج شامل Al3Cu5Zn4، Al3Cu3Zn، رسوبات Al3Cu توزیع شده در زمینه‌ی محلول جامد آلومینیم و نهایتا ساختار یوتکتیک غیرعادی α-Al/Al3Cu در مجاورت آلومینیم است.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Study of interface of Al-brass composite fabricated by centrifugal casting

نویسندگان [English]

  • Morteza Gholami 1
  • Mehdi Divandari 2
  • Mohammad Taghi Salehi 2

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

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

چکیده [English]

In this research interface of aluminum-brass bimetal composite, fabricated by a vertical centrifugal casting machine, were investigated. At first, brass bushes were preheated at 100-300 °C temperature range and then aluminum melt with 1.5 melt-to-solid volume ratio was cast into cylindrical bush rotating at 800, 1600, and 2000 (rpm), respectively. Obtained samples were studied using optical microscope (OM), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and Image J software. Results show that metallurgical joint in this work is probably due to particular dissolving condition, provided by multiple mechanical forces involved and also possible solid diffusion at the end of solidification process. Study of the EDS results show that layers formed at the achieved interface consisted of four discrete layers from the brass side, including Al3Cu5Zn4, Al3Cu3Zn, Al3Cu precipitates scattering in aluminum matrix and finally α-Al/Al3Cu anomalous eutectic structure near the aluminum side.

کلیدواژه‌ها [English]

  • interface
  • Composite
  • Al-Brass
  • dissolving
  • centrifugal casting

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