بررسی ریزساختار و خواص استحکامی آلیاژ ریختگی آلومینیوم سری 500 اصلاح شده با عنصر نادر خاکی ایربیوم

نوع مقاله : علمی و پژوهشی

نویسنده

• محمد علی پور

گروه مهندسی مواد، دانشکده مکانیک، دانشگاه تبریز، تبریز، ایران

10.22067/jmme.2023.81595.1106

چکیده

در این تحقیق اثر افزودن Er بر خواص کششی و ریزساختار آلیاژ ریختگی Al-3Mg-2.5Cu مورد بررسی قرار گرفته است. نتایج نشان می‌دهند که با افزودن یک درصد وزنی Er به آلیاژ ریختگی، می‌توان دانه‌ها را ریز کرده و به ساختار یکنواخت رسید. ریزساختارها و سطوح شکست نمونه‌های آلیاژ آلومینیوم ریختگی با میکروسکوپ الکترونی روبشی (SEM) مورد بررسی قرار گرفتند. در ضمن، افزودن Er ساختار یوتکتیک را اصلاح کرده و از یک ساختار نوک تیز و صفحه مانند درشت به یک ساختار فیبری و شاخه‌ای ریز تبدیل کرد. خواص کششی با افزودن Er تقویت شده و استحکام کششی نهایی Mpa 310 با افزودن یک درصد وزنی Er حاصل گردید. همچنین، مطالعات شکست‌نگاری نشان داد که حفره‌های ریزشده و دندریت‌ها از حالت کشیده و درشت به ساختار کروی تبدیل شده‌اند که دلیل اصلی استحکام کششی نهایی بالا بوده است. با افزودن 1 درصد وزنی Er ، 38 درصد بهبود خواص استحکامی نسبت به آلیاژ پایه بدست آمد.

کلیدواژه‌ها

• عناصر نادر خاکی
• خواص مکانیکی
• ریزساختار

موضوعات

• ریخته گری و انجماد

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عنوان مقاله [English]

Investigating the microstructure and strength properties of 500 series aluminum casting alloy modified with rare earth element erbium

نویسنده [English]

• Mohammad Alipour

Faculty of Mechanical engineering, Department of Materials Engineering, University of Tabriz, Iran

چکیده [English]

The effects of rare earth Er additions on the microstructure and tensile properties of cast Al–3Mg–2.5Cu aluminum alloy have been investigated. The results show that by adding 1 wt.% Er grain refiner in the aluminum cast alloy, the grains can be refined to a fine degree. The microstructures and fracture surfaces of cast aluminum alloy samples were examined by scaning electron microscopy (SEM). In addition, the rare earth Er modified the eutectic structure from a coarse plate-like and acicular structure to a fine branched and fibrous one. The tensile properties were improved by the addition of rare earth Er, and good ultimate tensile strength (310 MPa) was obtained when the rare earth Er addition was 1 wt.%. Furthermore, fractographic examinations revealed that refined pore and spheroidized α-Al dendrite were responsible for the high ultimate tensile strength. Adding of 1 wt.% rare earth Er make about 38% enhancement in tensile strength compared to that of unreinforced aluminum alloy.

کلیدواژه‌ها [English]

• Rare earth materials
• Mechanical Properties
• Microstructure

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