نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی مواد، دانشکده مهندسی شهید نیکبخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران

2 استادیار، گروه مهندسی مواد، دانشکده مهندسی شهید نیکبخت، دانشگاه سیستان و بلوچستان، زاهدان، ایران

10.22068/jstc.2018.84355.1431

چکیده

اصلاح ذرات تقویت‌کننده Mg2Si در کامپوزیت‌های درجای Al-Mg2Si به عنوان عامل کلیدی برای بهبود خواص مکانیکی این کامپوزیت‌ها به شمار می‌رود. در تحقیق حاضر، اثر افزودن اربیم بر مشخصه‌های ریزساختاری و رفتار فشاری کامپوزیت درجای Al-15 wt.% Mg2Siمورد بررسی قرار گرفته است. ریزساختار نمونه‌ها با استفاده از میکروسکوپ‌های نوری و الکترونی روبشی مورد مطالعه قرار گرفت. نتایج این تحقیق نشان داد که با افزودن 0.6 درصد وزنی اربیم اندازه ذرات Mg2Si اولیه از 14 به 8.5 میکرومتر کاهش یافته و همچنین مورفولوژی آن‌ها از حالت دندریتی به حالت چندوجهی تبدیل شد. افزودن اربیم باعث تغییر مورفولوژی Mg2Si یوتکتیکی از حالت ورقه‌ای به حالت الیافی ریز شد. در کنار این موارد، مقداری ترکیب Al3Er در حین انجماد کامپوزیت در ناحیه یوتکتیکی تشکیل شد. نتایج آزمون فشار نشان داد که افزودن اربیم باعث بهبود استحکام فشاری کامپوزیت می‌شود به طوری که بیشترین میزان بهبود (32 درصد) در ارتباط با نمونه حاوی 0.6 درصد اربیم مشاهده شد.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Er addition on the microstructural characteristics and compressive behavior of insitu Al-15 wt.% Mg2Si composites

نویسندگان [English]

  • Zahra Rousta 1
  • Hamed Khosravi 2
  • Esmaeil Tohidlou 2

1 Department of Materials Engineering, University of Sistan and Baluchestan, Zahedan, Iran

2 Department of Materials Engineering, University of Sistan and Baluchestan, Zahedan, Iran

چکیده [English]

The modification of Mg2Si is considered as a key parameter to improve the mechanical properties of Al-Mg2Si composites. In the present work, the effect of erbium (Er) on the microstructural charactristics and compressive behavior of cast Al-15 wt.% Mg2Si in situ metal matrix composite was studied. Microstructural examination was conducted using optical and scanning electron microscopy (SEM). The results showed that the size of the primary Mg2Si phase was reduced from 14 to 8.5 μm with the addition of 0.6 wt.% Er and the its morphology was modified from a coarse dendritic shape to a polyhedral shape. Through the addition of Er, the morphology of eutectic Mg2Si was also altered from coarse flake-like to a fine fibrous form. Besides, it was found that some Al3Er compound were formed during solidification. Compression test indicated that Er addition enhanced the compressive strength of the composite. The highest compressive strength was obtained for the 0.6 wt.% of Er-modified composite with 32% increase.

کلیدواژه‌ها [English]

  • Al-Mg2Si in situ composite
  • Erbium
  • Microstructure
  • Compressive strength

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