مطالعه تجربی رفتار خزشی کامپوزیت Al2024/SiC تولید شده به روش اتصال نورد تجمعی
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوینعلی 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
کلید واژه: کامپوزیت, نورد تجمعی, خزش, آلومینیم, تقویت‌کننده,
چکیده مقاله :
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.
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.
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