نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، دانشکده مهندسی مواد، دانشگاه بوعلی سینا، همدان، ایران

2 دانشجوی کارشناسی ارشد، دانشکده مهندسی مواد، دانشگاه بوعلی سینا، همدان

3 استادیار، دانشکده مهندسی مواد، دانشگاه بوعلی سینا همدان، همدان، ایران

4 استادیار، دانشکده مهندسی مواد، دانشگاه صنعتی همدان، همدان، ایران

5 دانشجوی دکترا، دانشکده مهندسی مکانیک، دانشگاه بوعلی سینا همدان، همدان، ایران

چکیده

فرآوری اصطکاکی اغتشاشی، یک فرآیند جدید برای اصلاح ریزساختار، خواص مکانیکی مواد و تولید کامپوزیت سطحی محسوب می‌شود. در این پژوهش، از این فرآیند برای تولید کامپوزیت سطحی زمینه فلزی آلومینیم 5083 با ذرات تقویت کننده کاربید سیلیسیم با اندازه میانگین 5 میکرون استفاده شد. ابتدا ترکیبی از سرعت پیشروی و دورانی بر روی نمونه‌ها اعمال شد. سپس نمونه بهینه با در نظر گرفتن نتایج ریز ساختاری و با توجه به بیشترین استحکام کششی انتخاب شد. نمونه بهینه دارای سرعت دورانی 1000 دور بر دقیقه و سرعت پیشروی 28 میلیمتر بر دقیقه است. پس از آن بر روی نمونه بهینه اثر تعداد پاس مورد بررسی قرار گرفت. کامپوزیت سطحی تولید شده به‌منظور بررسی ریز ساختار با میکروسکوپ نوری و الکترونی بررسی شد. همچنین خواص مکانیکی کامپوزیت تولید شده از قبیل میکروسختی و استحکام کششی مورد بررسی قرار گرفت تا نسبت به فلز پایه مقایسه شود. نتایج تست‌های مکانیکی نشان دهنده آن است که میکروسختی و استحکام کششی نسبت به فلز پایه بهبود یافته است. میکروسختی و استحکام کششی فلز پایه و نمونه چهار پاسه با تغییر جهت چرخش به ترتیب 85 ویکرز و 285 مگاپاسکال، 118 ویکرز و 316 مگاپاسکال رسید

چکیده تصویری

کلیدواژه‌ها

موضوعات

عنوان مقاله [English]

Fabrication of A5083/SiC surface composite by friction stir processing and its characterization

نویسندگان [English]

  • Saeed Ahmadifard 1
  • Nasir Shahin 2
  • Shahab Kazemi 3
  • Akbar Heidarpour 4
  • Ali Shirazi 5

1 Department of Material Engineering, Bu Ali Sina University, Hamedan, Iran

2 Department of Material Engineering, Bu Ali Sina University, Hamedan, Iran

3 Department of Material Engineering, Bu Ali Sina University, Hamedan, Iran

4 Department of Metallurgy and Materials Engineering, Hamedan University of Technology, Hamedan, Iran.

5 Department of Mechanical Engineering, Bu Ali Sina University, Hamedan, Iran

چکیده [English]

Friction stir processing (FSP) is a novel process for refinement of microstructure, improvement of material’s mechanical properties and production of surface layer composites. In this investigation via friction stir processing, metal matrix composite (MMC) was fabricated on surface of 5083 aluminum sheets by means of 5 μm SiC particles. First combination of rotational speed and travelling speeds were performed. Optimum condition was selected due to highest tensile strength. It was seen that sample which fabricated by 1000rpm and 28mm/min had improvement in tensile strength in comparison to other conditions. After that the effect of multipass on the optimum sample were investigated. The friction processed surface composite layer was analyzed through optical and scanning electron microscopical studies. Mechanical properties of the friction stir processed surface composites were evaluated through microhardness and universal tensile tests. The results were compared with the properties of the base metal. The surface composite layer resulted in that change of tool rotational direction between FSP four passes exhibited better properties in hardness, tensile behavior and wear resistance compared to the behavior of the base metal. The microhardness and tensile strength of the as-received alloy, and surface composite after that change of tool rotational direction between four passes specimens were about 85Hv and 285 MPa, 118Hv and 316 MPa, respectively.

کلیدواژه‌ها [English]

  • Friction stir processing
  • Al5083
  • Mechanical properties
  • Microstructure

 

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