نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، مهندسی مواد، دانشگاه حکیم سبزواری، سبزوار، ایران

2 -2 دانشیار، مهندسی مواد، دانشگاه حکیم سبزواری، سبزوار، ایران

3 استادیار، مهندسی مواد، دانشگاه فنآوریهای نوین، سبزوار، ایران

چکیده

فرایند اتصال نورد انباشتی یکی از روش‌های تغییر شکل پلاستیک شدید برای تولید مواد‌ فوق ریزدانه با استحکام بالا می‌باشد. در این پژوهش از فرایند جدید اتصال نورد انباشتی ترکیبی برای تولید کامپوزیت زمینه آلومینیومی تقویت شده با ذرات آلومینا و نانولوله‌ی کربنی استفاده شد. این فرایند در واقع ترکیبی از روش اتصال نورد انباشتی همراه با آنیل متناوب و روش اتصال نورد انباشتی متقاطع می‌باشد. این فرایند شامل دو مرحله است. در مرحله‌ی اول افزودن تقویت کننده همراه با اتصال نورد انباشتی در چهار پاس ابتدایی نورد، به همراه آنیل ورقها پس از هر پاس بمدت یک ساعت در دمای C° 350 و در مرحله‌ی دوم اتصال نورد انباشتی بدون اضافه کردن تقویت‌کننده و بدون آنیل، انجام شد. در هر دو مرحله پس از هر پاس نورد، ورق ها به اندازه‌ی°90 در جهت ساعتگرد چرخیده و سپس نورد شدند. کامپوزیت زمینه آلومینیومی با 1% وزنی تقویت‌کننده‌ی نانولوله‌ی کربنی تا 11 پاس و کامپوزیت هیبریدی زمینه آلومینیومی با 1% وزنی نانولوله‌ی کربنی و 2% وزنی آلومینا تا 9 پاس نورد تولید شدند. نتایج XRD نشان دهنده ایجاد دانه های فرعی در حد ابعاد نانو‌متری در پاس انتهایی در هر دو کامپوزیت می‌باشند.

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

The investigation and comparison of mechanical propertise and microstructure Al/CNT and Al/CNT/Al2O3 copmosites produced by mixed accumulative roll bounding

نویسندگان [English]

  • Ali Tabesh 1
  • Gholamreza Ebrahimi 2
  • hamid ezatpor 3

1 Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran.

2 - Department of Materials and Polymer Engineering, Hakim Sabzevari University, Sabzevar, Iran

3 2- Faculty of Engineering, Sabzevar University of New Technology, , Iran

چکیده [English]

Accmulative roll bonding prcess is one of severe plastic deformation procidures for produce high strength-ultrafine grain materials. In this investigation, the new method of mixed accumulative roll bonding was used to produce Al-based composite reinforced with carbon nanotube and alumina. This method is mixed of Continual Annealing roll Bonding and cross roll accumulative roll bonding procedures. This process has two steps. The first step is reinforcement adding with accumulative roll bonding in four rolling passes and annealing for one hour and 350°C after any pass. The next step is accumulative roll bonding without adding reinforcement and annealing. After any rolling pass, strips rotate 90° in each step and then rolled. In this process 11 rolling passes perform on Al/(1%wt CNT) composite and 9 rolling passes on Al/(1%wt)CNT/(2%wt) AL2O3 composite. X-ray diffraction result show that grain size is about nanometer in final rolling pass for both composite and with increase pass number increases tensile strength and elongation decrease first and then increases. strenght in Al/CNT/Al2o3 composite is higher than Al/CNT composite at the same rolling pass. FESEM picture show that reinforced distribution was well in final rolling pass.

کلیدواژه‌ها [English]

  • Hybrid composite
  • Mixed accumulative roll bonding process
  • Carbon Nanotube
  • Mechanical properties
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