مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

ریزساختار و خواص مکانیکی کامپوزیت چندلایه‌ای AA2024/AA7072/AA2024 فرآوری شده به روش نورد تجمعی

نوع مقاله : مقاله پژوهشی

نویسندگان
1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مواد، دانشگاه صنعتی سهند، تبریز، ایران
2 عضو هیئت‌علمی، گروه مهندسی مواد، دانشگاه بناب، بناب، ایران
چکیده
در مطالعه حاضر، کامپوزیت چند­­لایه AA2024/AA7072/AA2024 از طریق فرایند اتصال نوردی تجمعی در دمای 250 درجه سانتی ­گراد تولید و خواص مکانیکی آن بعد از پاس ­های مختلف تغییر شکل پلاستیک شدید در دمای محیط ارزیابی شد. مشاهده شد که بعد از اولین مرحله نورد تجمعی، همه لایه‌ها یکنواخت و پیوسته هستند؛ اما پس از مرحله چهارم  نورد تجمعی، در لایه‌های AA7072 به ­تدریج گلویی ایجاد­­­­­­­­شده و با ادامه تغییر شکل تا سیکل ششم به دلیل شکل‌پذیری پایین‌تر به قطعات کوچک تقسیم می­شوند. پس از هفتمین مرحله از تغییر شکل به روش نورد تجمعی، لایه­ های شکسته شده AA7072 به صورت غیر یکنواخت در زمینه AA2024 توزیع می­ شوند. علاوه­ بر این، تجزیه ­و ­تحلیل با استفاده از تصاویر میکروسکوپ الکترونی روبشی برای مشاهده تحولات ریزساختاری و مکانیسم شکست انجام شد. همچنین خواص مکانیکی کامپوزیت حاصل با استفاده از آزمایش کشش و اندازه‌گیری سختی لایه ­ها ارزیابی شد. مشاهده شد که سختی و استحکام کششی با افزایش تعداد پاس­ های نورد تجمعی بهبود می‌یابد. حداکثر استحکام کششی در حدود 389 مگاپاسکال و بعد از 7 مرحله نورد تجمعی با کاهش سطح مقطع 50 درصد به­ دست آمد.
کلیدواژه‌ها

عنوان مقاله English

Microstructure and mechanical properties of AA 2024/AA 7072/AA 2024 multilayer composites prepared by accumulative roll bonding

نویسندگان English

Hassan Ebrahimi Bavili 1
Mehdi Shaban Ghazani 2
Ali Fardi Ilkhchy 2
1 MSc Graduate, Department of Materials Science Engineering, Sahand University of Technology, Tabriz, Iran
2 Faculty Member, Department of Materials Science Engineering, University of Bonab, Bonab, Iran
چکیده English

In the present study, the AA 2024/AA 7072/AA 2024 multilayer composite was fabricated through an accumulative roll bonding process at 250°C. The resultant mechanical properties were evaluated after different deformation cycles at ambient temperature. It was observed that all layers were uniform and continuous during the first cycle of accumulative roll bonding. Still, after the 4th ARB cycle, AA 7072 layers were gradually necked and separated into small fragments with continuous deformation up to the 6th cycle due to lower formability compared with AA 2024 layers. After the 7th deformation cycle of ARB processing, AA 7072 fragments were distributed non-uniformly in the AA 2024 matrix. In addition, fractography analysis was conducted using scanning electron microscopy (SEM) to observe the microstructure evolution and the fracture mechanism. Also, the mechanical properties were evaluated by tensile testing and micro-hardness measurements. It was observed that hardness and tensile strength improve with increasing accumulative roll bonding cycles. Maximum tensile strength of about 389MPa was obtained after 7 cycles of accumulative roll bonding.

کلیدواژه‌ها English

Multilayer Composite
Accumulative Roll Bonding
Microstructure
Mechanical Properties
Severe Plastic Deformation
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