مطالعه تجربی رفتار خزشی کامپوزیت Al2024/SiC تولید شده به روش اتصال نورد تجمعی

نوع مقاله : مقاله پژوهشی

نویسندگان

• علی سهیلی مقدم ¹
• حمیدرضا محمدیان سمنانی ²
• غلامرضا ابراهیمی ³

¹ کارشناسی ارشد، مهندسی مواد، دانشگاه سمنان، سمنان

² استادیار، مهندسی مواد، دانشگاه سمنان، سمنان

³ دانشیار، مهندسی مواد، دانشگاه حکیم سبزواری، سبزوار

چکیده

ویژگی­های منحصر به فردی نظیر مدول الاستیسیته و ضریب انبساط حرارتی بالا به همراه سهولت تولید و نیز وزن کم موجب شده تا کامپوزیت­های زمینه آلومینیمی مقاوم شده با ذرات سرامیکی در دهه­های اخیر مورد توجه قرار گیرند. در این تحقیق، کامپوزیت Al2024/SiC به ازای مقادیر 1، 2 و 3 درصد مقاوم­ساز به روش نورد تجمعی تولید شد. فرآیند تولید به گونه­ای بود که نمونه­ها در سیکل ابتدایی 60 درصد کاهش سطح مقطع و در سیکل­های بعدی (3 سیکل) 50 درصد کاهش سطح مقطع را تجربه کردند. خواص مکانیکی نمونه­ها شامل سختی­سنجی و آزمایش خزش مطالعه شد. آزمون خزش تحت شرایط  محدوده حرارتی C°350-250 و تنش MPa40 - 30 انجام شد. نتایج نشان داد کامپوزیت Al2024+1%SiC دارای سختی بالاتری است به طوری که می­توان چسبندگی مطلوب ورق­های آلومینیم به یکدیگر به علت حضور کسر حجمی پایینی از ذرات SiC را عامل آن دانست. افزون بر این، نتایج آزمون خزش حاکی از آن بود که عمر خزشی این کامپوزیت فراتر از سایر کامپوزیت­های تولیدی است. شایان ذکر است که عمر خزشی کلیه  کامپوزیت­های تولیدی به طور قابل ملاحظه­ای کم­تر از نمونه­ خام اولیه (Al2024-T₃) اندازه­گیری شد.

کلیدواژه‌ها

• آلومینیم
• کامپوزیت
• تقویت‌کننده
• نورد تجمعی
• خزش

20.1001.1.22285946.1397.8.31.12.9

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عنوان مقاله [English]

Experimental Study on Creep Behavior of Al2024/SiC Composite Produced via Accumulative Roll Bonding (ARB) Process

نویسندگان [English]

• A Soheili Moghaddam ¹
• H.R Mohammadian Semnani ²
• GH Ebrahimi ³

² Department of Materials and Metallurgical Engineering, Semanan University, Semnan, Iran

چکیده [English]

Excellent features including high elastic modulus and thermal expansion coefficient associated with low weight and the ability to manufacture with conventional techniques were developed Aluminium composites reinforced with cremic particles at recent decades. In this work, Al2024/SiC composites with different SiC percentages (1,2,3%) were produced by Accumulative Roll Bonding (ARB) process. In order to produce composite samples 60% reduction rolling were applied to the samples firstly and then rolled strips cutted out into two parts and again subjected to 50% reduction for 3 passes. Mechanical properties of samples were investigated. Creep tests were done at temperature and stress range about 250-350°C and 30-40 MPa respectively. According to the results, Al2024+1%SiC composite had higher hardness degree than the other composites because of appropriate adhesion of raw strips together due to lower volume of SiC powder in this composite and acceptable consistency of particles into the matrix. Moreover, creep life of this sample was higher than the other. It is obvious that the creep life of All composites produced were several times less than the Al2024-T3 original raw sample.

کلیدواژه‌ها [English]

• Aluminium
• composite
• Reinforcement
• accumulative roll bonding
• Creep

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