نوع مقاله : مقاله کامل پژوهشی

نویسندگان

1 دانشیار، گروه مهندسی مواد و متالورژی، دانشکده فنی و مهندسی، دانشگاه اراک، اراک، مرکزی، ایران

2 دانشجوی کارشناسی ارشد، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران

3 استاد، دانشکده مهندسی مواد و متالورژی، دانشگاه علم و صنعت ایران، تهران، ایران

چکیده

فرایند اتصال نورد تجمعی (ARB) یکی از روش‌های تغییرشکل پلاستیک شدید است که با اعمال کرنش‌های پلاستیک شدید سعی در ریزدانه‌کردن مواد و تولید مواد نانوساختار در حد چند 10 نانومتر یا ساختار فوق‌ریزدانه حدود 100 نانومتر دارد. در این پژوهش، تأثیر جهت برس‌کاری سطح پیش از نورد و همچنین انجام عملیات حرارتی بازپخت بر استحکام اتصال حاصل از فرایند اتصال نورد تجمعی و سطح شکست آلیاژ آلومینیم AA6061 بررسی شد. بدین‌منظور، برس‌کاری سطح ورق‌ها در جهت نورد (RD)، جهت عرضی نورد (TD) و ترکیب آن‌ها (RD-TD) انجام شد. همچنین، فرایند اتصال نورد تجمعی تا 5 سیکل انجام شد. عملیات بازپخت پس از سیکل اول و در دمای 415 درجه سلسیوس به‌مدت 2 ساعت انجام شد. استحکام اتصال با استفاده از آزمایش لایه‌کنی بررسی شد. پروفیل سختی در مقطع ضخامت نمونه‌ها انجام شد. نتایج نشان می‌دهد که برس‌کاری سطح و در جهت نورد (RD) با استحکام متوسط 60/0 نیوتن بر میلی‌متر (N/mm) در مقایسه با دو جهت دیگر بهترین اتصال را دارد. بررسی سطوح شکست با استفاده از تصاویر میکروسکوپ الکترونی روبشی (SEM) حاکی از وجود مناطق اتصال مکانیکی بیشتر و وسیع‌تر در این نمونه است. همچنین، انجام عملیات بازپخت پس از هر سیکلِ اتصال نورد تجمعی باعث بهبود استحکام اتصال می‌شود.
 

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Effect of Brushing Direction and Annealing on the Microstructure and Bonding Strength of AA6061 Aluminum Alloy Processed by Accumulative Roll-Bonding

نویسندگان [English]

  • Bahman Mirzakhani 1
  • Alireza Khojasteh Abbasi 2
  • Saeed Shabestari 3

1 Associate Professor, Department of Materials Science and Engineering, School of Engineering, Arak University, Arak, Markazi, Iran

2 M. Sc. Student, School of Metallurgy and Materials Engineering, Iran University of Science & Technology, Tehran, Iran

3 Professor, School of Metallurgy and Materials Engineering, Iran University of Science & Technology, Tehran, Iran

چکیده [English]

Accumulative Roll-Bonding (ARB) process is a Severe Plastic Deformation (SPD) process run to produce Ultra-Fine Grained (UFG) sheets using intense plastic strains via rolling machine. In this research, the effect of surface condition (brushing) and annealing treatment on the fracture surface and bonding strength of the ARBed AA6061 sheets was investigated. In this regard, the specimen surfaces were first brushed in three different directions, i.e., Rolling Direction (RD), Transverse Direction (TD), and both RD and TD. The ARB process was conducted up to five cycles, and specimens were tested after the first, third, and fifth cycles. The annealing treatment was conducted for two hours at 415 °C after the first, third, and fifth cycles. The bonding strength and hardness profile in the cross-section (perpendicular to the rolling direction) were measured through peeling and hardness tests, respectively. The results show that RD is the most effective direction for brushing to achieve high bonding strength with the mean strength of 0.60 N/mm. The fracture surfaces of the specimen were observed using a Scanning Electron Microscope (SEM). The results represent the broad areas of mechanical bonding in the rolling direction. Further, post-annealing treatments are shown to increase the bonding strength

کلیدواژه‌ها [English]

  • Accumulative Roll-Bonding
  • AA6061 Alloy
  • Brushing
  • Peeling Test
  • Fractography
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