اثر کاهش اندازه دانه بر خواص مکانیکی آلیاژ Al-0.7Fe با افزودن سدیم مولیبدات به مذاب

نویسندگان

گروه فلزات پژوهشکده مواد، پژوهشگاه علوم و تکنولوژی پیشرفته و علوم محیطی، دانشگاه تحصیلات تکمیلی صنعتی و فناوری پیشرفته کرمان

چکیده

سدیم مولیبدات (Na2MoO4) به‌عنوان ماده­ای برای اصلاح اندازه دانه در آلیاژ Al-0.7Fe استفاده شد. نمونه­های Al-Fe با افزودن درصدهای وزنی مختلفی از سدیم مولیبدات شامل 1/0، 2/0، 3/0، 4/0 و 5/0 به­وسیله ریخته­گری در قالب ماسه­ای در °C 750 تولید شدند. بررسی ریزساختارهای حاصل از ریخته­گری، به‌وسیله میکروسکوپ الکترونی روبشی و پراش پرتوی ایکس و اثر بر ریزساختار توسط سدیم مولیبدات، با اندازه­گیری متوسط اندازه دانه و پهنای ترکیب بین­فلزی تشکیل شده و انجام آزمون­های کشش و سختی انجام شد. نتایج نشان داد که با افزودن سدیم مولیبدات، اصلاح ریزساختار با کاهش متوسط اندازه دانه صورت پذیرفت. هم­چنین، مقدار بهینه برای افزودن سدیم مولیبدات به مذاب در این پژوهش معادل 3/0 درصد وزنی بود.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Grain Size Reduction by Sodium Molybdate on Mechanical Properties of Al-0.7Fe Alloy

نویسندگان [English]

  • M. Alizadeh
  • M. Hajizamani
Department of Metals, Institute of Science and High Technology and Environmental Sciences, Graduate University of Advanced Technology, Kerman, Iran
چکیده [English]

Sodium molybdate (Na2MoO4) as a grain refiner was used to refine the microstructure of Al-0.7Fe alloy. Al-Fe samples with the addition of 0.1, 0.2, 0.3, 0.4 and 0.5 wt.% sodium molybdate were fabricated by casting in sand molds at 750 ͦC. The microstructures of the as-cast samples were investigated by scanning electron microscopy (SEM) and the present phases were revealed by X-ray diffraction (XRD). The effect of sodium molybdate on the microstructure was examined by measuring the average grain sizes of the alloys, determining the widths of intermetallic compounds and carrying out hardness and tensile tests. The results showed that the addition of sodium molybdate modified the microstructure of Al-Fe alloy by reducing the average grain sizes. Also, it was found that the optimum amount of sodium molybdate to add to Al-0.7Fe alloy melt was 0.3 wt.% in this study.

کلیدواژه‌ها [English]

  • Grain size reduction
  • Sodium molybdate
  • Aluminum-Iron alloy
  • intermetallic compound
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