تاثیر عملیات حرارتی پیر سختی (T6) بر ریزساختار و خواص سایشی نانوکامپوزیت آلیاژ آلومینیوم Al-8Zn-3Mg-2.5Cu تقویت شده با نانو صفحات گرافن

نوع مقاله : علمی و پژوهشی

نویسنده

• محمد علی پور

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

10.22067/jmme.2022.78198.1070

چکیده

در این تحقیق، خواص سایشی و ریزساختار نانوکامپوزیت آلیاژ آلومینیوم Al-8Zn-3Mg-2.5Cu تقویت شده با 0.1، 0.3، 0.5، 0.7 و 1 درصد نانو صفحات گرافن تولید شده به روش ریخته گری گردابی با کمک حباب زائی مافوق صوت بررسی شد. همچنین  برای مطالعات ریزساختاری و سطوح سایش، میکروسکوپ الکترونی روبشی بکار گرفته شد. مطالعات ریزساختاری نانوکامپوزیت نشان داد که حضور نانو صفحات گرافن پراکنده باعث کاهش اندازه دانه شد
ه، اما در درصدهای بالای این نانوذرات (1 درصد وزنی)، کاهش محسوسی در اندازه دانه ایجاد نمی­شود. همچنین حضور نانوذرات و کاهش اندازه دانه، افزایش چشمگیر مقاومت به سایش نانوکامپوزیت را به همراه دارند. البته در درصدهای بالای نانو صفحات گرافن (1 درصد وزنی)، این نانو مواد در مرزدانه ها کلوخه ای شده و باعث کاهش مقاومت به سایش کامپوزیت شدند. نانوکامپوزیت تقویت شده با 0.5% وزنی نانو صفحات گرافن قبل و بعد از عملیات حرارتی بهترین مقاومت به سایش  را نشان داد که بهینه ترین درصد نانو صفحات گرافن می باشد.

کلیدواژه‌ها

• نانوکامپوزیت ریختگی
• نانو صفحات گرافن
• ریخته گری گردابی
• فرآوری مافوق صوت

موضوعات

• ریخته گری و انجماد

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عنوان مقاله [English]

The effect of age hardening heat treatment (T6) on the microstructure and wear behavior of Al-8Zn-3Mg-2.5Cu nanocomposite reinforced with graphene nano plates

نویسنده [English]

• Mohammad Alipour

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

چکیده [English]

In this study, microstructure and wear behavior of Al-8Zn-3Mg-2.5Cu aluminum alloy matrix nanocomposite reinforced with 0.1, 0.3, 0.5, 0.7 and 1 wt.% graphene nano plates (GNPs) produced by stir casting and ultrasonic treatment have been investigated. Ultrasound device equipped with a cooling system with high powers was used for mixing alloy and nanoparticles. Also the microstructure and wear surfaces of nanocomposite was investigated by scanning electron microscope equipped with EDS analysis. The microstructural studies of the nanocomposite revealed that GNPs addition reduces the grain size, but adding high GNPs content (1 wt.%) does not change the grain size considerably. Further investigations on wear revealed that the addition of GNPs increases wear resistance . At high GNPs contents (1 wt.%), the presence of GNPs agglomerate on grain boundaries was found that causes decrease the wear resistance. The optimum amount of nanoparticles is 0.5 wt.% GNPs that nanocomposite exhibits bes wear resistance.

کلیدواژه‌ها [English]

• Casting nanocomposite
• Graphene nano plates
• Stir casting
• Ultrasonic treatment

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