اثر بور و زیرکونیوم بر ریزساختار و خواص مکانیکی آلیاژهای ریختگی آلومیناید آهن Fe3Al

نویسندگان

1 1. دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران

2 2. دانشکده فنی، دانشگاه آزاد اسلامی واحد کرج

چکیده

در این پژوهش، اثر بور و زیرکونیوم بر ریزساختار و خواص مکانیکی آلیاژهای بر پایه  Fe3Alمورد مطالعه قرار گرفته است. به‌منظورآلیاژسازی از کوره القایی تحت خلأ استفاده شد و ریخته‌گری در قالب فلزی صورت گرفت. بررسی‌های ریزساختاری، فازشناسی، خواص مکانیکی فشاری، کششی و همچنین شکست‌نگاری روی نمونه‌ها انجام گرفت. بر اساس مشاهدات ریزساختاری، ریزساختار آلیاژها به‌صورت دندریتی است و فازهای رسوبی به‌طور عمومی در مناطق بین دندریتی حضور دارند. افزودن بور و زیرکونیوم موجب تشکیل فازهای رسوبی بورایدی ولاوه در آلیاژ می‌شود. بررسی تأثیر عناصرآلیاژی افزوده شده به آلیاژ نشان می‌دهد، زیرکونیوم به‌علت تشکیل فازهای لاوه بیشترین تأثیر را بر بهبود خواص مکانیکی آلیاژها دارد. بررسی مکانیزم شکست در بین آلیاژها، حاکی از شکست ترد در آنها است..

کلیدواژه‌ها

عنوان مقاله [English]

The Effect of Boron and Zirconium on the Microstructure and Mechanical Properties of Cast Fe3Al-Based Alloys

نویسندگان [English]

  • M. Rajabi 1
  • M. Shahmiri 1
  • M. Ghanbari 2
1 1. Department of Materials Engineering, Iran University of Science and Technology, Tehran, Iran.
2 2. Department of Engineering, Islamic Azad University, Karaj Branch, Karaj, Iran.
چکیده [English]

In this study, the effects of boron (B) and zirconium (Zr) on the microstructure and mechanical properties of Fe3Al-based alloys were investigated. Cylindrical samples were produced using a vacuum induction melting furnace (VIM); consequently, the melt was cast into a metallic mold. The microstructure, phase identification, tensile and compressive mechanical properties and fractography of the samples were investigated. Upon microstructural observation, it was found that the alloys microstucture was denderitic and the precipitated phases were mostly present between interdendritic regions. Addition of B and Zr to the alloys resulted in the formation of boride precipitates and Laves phases. The results, therefore, showed that Zr had the most pronounced effect on the mechanical properties because of the formation of Laves phases. Fractographic studies of alloys also revealed that the brittle fracture was dominant between the samples.

کلیدواژه‌ها [English]

  • Iron Aluminide
  • Casting
  • microstructure
  • mechanical properties

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مواد پیشرفته در مهندسی
دوره 37، شماره 4
اسفند 1397
صفحه 43-57

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