تاثیر عملیات فراصوت ناپیوسته بر خواص مکانیکی و ریزساختار نانوکامپوزیت ریختگی Al413-SiCnp

نویسندگان

دانشکده مهندسی مواد، دانشگاه صنعتی اصفهان

چکیده

پراکنده‌سازی یکنواخت نانوذرات تقویت‌کننده در زمینه فلزی کامپوزیت‌های ریختگی از اهمیت بالایی برخوردار بوده، بر خصوصیات قطعات تولیدی تاثیر می‌گذارد. در این پژوهش برای اولین بار در ایران تاثیر عملیات فراصوت ناپیوسته در مذاب بر ریزساختار، پراکند‌گی نانوذرات تقویت‌کننده و بهبود خواص مکانیکی نانوکامپوزیت‌های ریختگی Al413-SiCnp دارای 5/0 تا 2 درصد وزنی تقویت‌کننده مورد بررسی قرار گرفت. یافته‌ها نشان داد که عملیات فراصوت ناپیوسته تاثیر بیش‌تری از عملیات فراصوت پیوسته با زمان مشابه بر بهبود خواص مکانیکی نانوکامپوزیت‌های ریختگی دارد به‌گونه‌ای که برای نمونه‌ کامپوزیتی دارای 2 درصد وزنی تقویت‌کننده که به‌صورت ناپیوسته در دو دوره 20 دقیقه‌ای تحت عملیات فراصوت قرار گرفته بود، افزایش استحکام تسلیم و استحکام نهایی نسبت به حالت خام به‌ترتیب برابر 106% و 94% بود. بهبود خواص مکانیکی تحت عملیات فراصوت ناپیوسته با ریز شدن شدید دانه‌ها و رسوب‌های یوتکتیکی در ساختار زمینه، زدودن بیش‌تر لایه‌های گازی باقی‌مانده روی سطح ذرات، خرد شدن بهتر کلوخه‌ها، ترشوندگی بیش‌تر و پراکندگی یکنواخت‌تر نانوذرات تقویت‌کننده در زمینه در حین مرحله اول انجماد مرتبط دانسته شد.

کلیدواژه‌ها


عنوان مقاله [English]

Effect of Discontinuous Ultrasonic Treatment on Mechanical Properties and Microstructure of Cast Al413-SiCnp Nanocomposites

نویسندگان [English]

  • M.R. Dehnavi
  • B. Niroumand
  • F. Ashrafizadeh
چکیده [English]

Effects of discontinuous ultrasonic treatment on the microstructure, nanoparticle distribution, and mechanical properties of cast Al413-SiCnp nanocomposites were studied. The results showed that discontinuous ultrasonic treatment was more effective in improving the mechanical properties of the cast nanocomposites than the equally timed continuous treatment. The yield and ultimate tensile strengths of Al413-2%SiCnp nanocomposites discontinuously treated for two 20 minute periods increased by about 126% and 100% compared to those of the monolithic sample, respectively. These improvements were about 107% and 94% for the nanocomposites continuously treated for a single 40 minute period. The improvement in the mechanical properties was associated with severe refinement of the microstructure, removal of the remaining gas layers on the particles surfaces, more effective fragmentation of the remaining agglomerates as well as improved wettability and distribution of the reinforcing particles during the first stage of solidification.

کلیدواژه‌ها [English]

  • Cast Nanocomposite
  • Al413-SiCnp
  • Discontinuous ultrasonic treatment
  • Distribution of reinforcing particles
  • mechanical properties
  • microstructure
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