نوع مقاله : مقاله کامل پژوهشی
نویسندگان
1 استاد، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران
2 استادیار، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران
3 محقق، مجتمع دانشگاهی مواد و فناوری‌های ساخت، دانشگاه صنعتی مالک اشتر، تهران، ایران
چکیده
هدف از این پژوهش ارزیابی ساختار ریختگی و همگن‌شده آلیاژ آنتروپی بالای Al10Co25Cr8Fe15Ni36Ti6 است. در این پژوهش، ریزساختار آلیاژ پس از ریخته‌گری در کورهٔ ذوب القایی تحت خلأ و کورهٔ ذوب مجدد قوسی و همچنین پس از همگنسازی در دمای 1220 درجهٔ سلسیوس به‌مدت 17 ساعت بررسی شده است. ریزساختار نمونه‌ها توسط میکروسکوپ نوری، میکروسکوپ الکترونی روبشی و پراش پرتو ایکس ارزیابی شد. براساس محاسبات، مقدار آنتروپی اختلاط آلیاژ kJ/mol ۰۵/13 ، 8/8 = δ و 97/7 = VEC است که پیش‌بینی می‌شود ساختار این آلیاژ شامل فازهای محلول جامد FCC و BCC و فازهای میانی باشد. در حالت ریختگی، ساختار در نواحی دندریتی متشکل از زمینه γ و رسوبات γʹ و نواحی بین‌دندریتی شامل رسوبات γʹ و فاز NiAl است. پس از انجام عملیات حرارتی همگنسازی، دندریت‌ها تا حدی حذف شده‌اند و از پیوستگی آن‌ها کاسته شده است که این مسئله به‌معنای یکنواخت‌تر شدن توزیع عناصر است. همچنین، پس از همگنسازی، فاز NiAl نیز از ساختار حذف شده است.
کلیدواژه‌ها
موضوعات
عنوان مقاله [English]
Microstructural Investigation of The Cast and Homogenized Al10Co25Cr8Fe15Ni36Ti6 High Entropy Alloy
نویسندگان [English]
- Seyed Mahdi Abbasi 1
- Masumeh Seifollahi 2
- Ebrahim Yousefi 3
1 Professor, Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
2 Assistant Professor, Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
3 Researcher, Faculty of Materials & Manufacturing Technologies, Malek Ashtar University of Technology, Tehran, Iran.
چکیده [English]
The as-cast and homogenized microstructures of Al10Co25Cr8Fe15Ni36Ti6 high entropy alloy were investigated in this study. To this end, the high entropy alloy was produced using vacuum induction melting and electro slag remelting processes, and the ESRed block was homogenized at the temperature of 1220 °C for 17 hr. The as-cast, as ESRed and homogenized microstructures were then investigated using optical microscopy, scanning electron microscopy, and X-ray diffraction. On the basis of theoretical measurements, the mixing entropy, atomic size differences, and Valence electron concentration were obtained as 13.05 kJ/mol, 8.8, and 7.97, respectively. These values can predict the formation of a solid solution matrix as the type of BCC + FCC and intermetallic phases. The as-cast microstructure included γ+ γʹ in the dendritic zones and γʹ+ NiAl in the interdendritic areas. After homogenization, the dendritic structures were almost eliminated, and they became discontinuous which is an indication of elements distribution homogenization. NiAl phase was also omitted after the homogenization process.
کلیدواژه‌ها [English]
- High Entropy Alloys
- Al10Co25Cr8Fe15Ni36Ti6
- Microstructure
- Homogenization
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