علوم و فناوری کامپوزیت

تاثیر دمای پیشگرم روی ضخامت و ساختار لایه فصل مشترک کامپوزیت دوفلزی آلومینیم- مس در روش گریز از مرکز عمودی

نوع مقاله : مقاله پژوهشی

نویسندگان

1 کارشناس ارشد، مهندسی مواد، دانشگاه آزاد اسلامی، کرج، ایران

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

3 کارشناس ارشد، مهندسی مواد، دانشگاه علم و صنعت - ایران، تهران ، ایران

چکیده

مصرف کامپوزیت‌های شامل دو یا چند فلز، با هدف بهبود بهره‌وری در صنایع مختلف، در سالهای اخیر افزایش یافته است. در این تحقیق، ریخته‌گری کامپوزیت دوفلزی آلومینیم- مس در حالت ذوب‌ریزی مذاب آلومینیم درون بوش جامد مسی به ابعاد، ارتفاع 40 میلی‌متر و قطر داخلی و خارجی 79 و 84 میلی‌متر، در سرعت دوران 1480 دور بر دقیقه و دماهای پیش‌گرم 100، 150، 200، 300 و 400 درجه‌ی سانتی‌گراد به وسیله‌ی دستگاه ریخته‌گری گریز از مرکز عمودی انجام شد و فصل مشترک تشکیل شده مورد مطالعه قرار گرفت. کاهش دمای پیش‌گرم با تشدید آهنگ تبرید موجب کاهش ضخامت فصل مشترک و نیز ظریف‌تر شدن ساختار یوتکتیک غیرعادی α-Al/Al3Cu می‌شود. بررسی‌های آنالیز میکروسکوپ الکترونی مجهز به طیف‌سنجی پراش انرژی پرتو ایکس (EDS) نشان داد فازهای (به ترتیب از سمت مس) AlCu2، AlCu و Al2Cu، رسوبات Al2Cu جدا شده از لایه‌ی سوم و پراکنده در زمینه‌ی از ساختار یوتکتیک غیرعادی α-Al/Al3Cu و نهایتا ساختار یوتکتیک غیرعادی α-Al/Al3Cu در مجاورت آلومینیم تشکیل شده است. سختی فصل مشترک تابع یک روند نزولی است به گونه‌ای که سختی فازهای تشکیل شده از سمت دیواره‌ی خارجی به طرف داخل قطعه ریختگی کاهش می‌یابد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of preheating temperature on thickness and interfacial microstructure of Aluminum-Copper bimetallic composite produced by vertical centrifugal casting

نویسندگان [English]

  • Ehsan Hiteh 1
  • Mehdi Divandari 2
  • Morteza Gholami 3

1 Department of Materials Engineering, Islamic Azad University of Karaj, Karaj, Iran

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

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

چکیده [English]

Application of composites of two or more metals has been increased, aiming to increase productivity, in various sectors of industry in recent years. In this work an Al/Cu bimetallic composite was prepared by casting Al melt into a Cu bush with 40 mm height and 79 and 84 inner and outer diameters, rotating at 1480 revolutions per minute (rpm), and 100, 150, 200, 300, and 400°C preheating temperature, respectively in a vertical centrifugal casting machine. Cooling rate increment, due to lower preheating temperature, not only lead to interface thinning but also it can modify microstructure. The results of scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDS) analysis showed that four discrete layers have been formed from the Cu side, including AlCu2, AlCu, Al2Cu continuous layers, Al2Cu precipitates scattering in anomalous eutectic structures and finally α-Al/Al3Cu anomalous eutectic structure near the Al side. Micro hardness measurements showed that hardness of various presented phases decreases from outward to the inward.

کلیدواژه‌ها [English]

  • interface
  • Aluminum
  • copper
  • centrifugal casting
  • dissolution
  • Preheating Temperature
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علوم و فناوری کامپوزیت
دوره 4، شماره 4
اسفند 1396
صفحه 391-398
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هم رسانی
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