مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

بررسی اثر تعداد پاس و نانوذرات ZrO2 بر ریزساختار، خواص مکانیکی و رفتار سایش در جوشکاری اصطکاکی اغتشاشی Al-5083

نویسندگان
سعید احمدی فرد 1
اکبر حیدرپور 2
شهاب کاظمی 3
1 دانشگاه بوعلی سینا همدان
2 دانشگاه صنعتی همدان
3 هیئت علمی رشته مهندسی مواد دانشگاه بوعلی سینا
چکیده
در این پژوهش از فرآیند جوشکاری اصطکاکی اغتشاشی برای انجام اتصال لب به لب آلیاژ آلومینیم 5083 و تولید همزمان نانوکامپوزیت Al-ZrO2 در محل اتصال استفاده شد. ابتدا متغیرهای جوشکاری اصطکاکی اغتشاشی شامل سرعت دورانی، سرعت پیشروی و زاویه انحراف مورد بررسی قرار گرفت تا نمونه‌ای که از نظر ظاهری بی‌عیب و بیشترین استحکام کششی را داشت، به عنوان نمونه مطلوب انتخاب شود تا با اضافه کردن نانوذرات زیرکونیا به بررسی اثر تعداد پاس بر ریزساختار، خواص مکانیکی و سایش نمونه‌های جوشکاری شده پرداخته شود. برای بررسی ریزساختار نمونه‌ها از میکروسکوپ‌های نوری، الکترونی روبشی و نیروی اتمی استفاده شد و نتایج نشان داد که با افزایش تعداد پاس، توزیع ذرات تقویت کننده یکنواخت‌تر شده و اندازه دانه در ناحیه اغتشاشی به شدت کاهش پیدا کرده است. علت این امر به حضور ذرات تقویت کننده مربوط می‌شود که با ایجاد قفل کنندگی مرزدانه‌ها، کمک به جوانه‌زنی دانه‌های تبلورمجدد یافته و تاثیر بر شکسته شدن دانه‌های اولیه می‌گردد. بیشینه سختی و استحکام کششی مربوط به نمونه چهار پاس بود که به ترتیب111 HV و 328.3 MPa بدست آمد که میزان سختی و کشش به ترتیب حدود 26 و 24 درصد نسبت به نمونه بدون پودر افزایش داشته است. برای ارزیابی مقاومت به سایش نمونه‌ها، از آزمون رفت و برگشتی استفاده شد و نتایج آزمون سایش نشان داد که با افزایش تعداد پاس میزان مقاومت به سایش افزایش می‌یابد.
کلیدواژه‌ها
جوشکاری اصطکاکی اغتشاشی
نانو ذرات
تعداد پاس
خواص مکانیکی
ریزساختار

عنوان مقاله English

The effects of Pass number and Nano-Size ZrO2 powder on the Mechanical, Microstructure and Wear behavior in Friction Stir Welding of the Al-5083

نویسندگان English

saeed ahmadifard 1
akbar heidarpour 2
Shahab Kazemi 3
1 Buali sina
2 hamedan university
3 department of material engineering, bu ali sina university, hamedan. Iran
چکیده English

In this study friction stir welding was used to perform butt joint of Al5083 and simultaneous production of Al-ZrO2 nanocomposite in weldment. Welding parameters such as rotational speed, travel speed and tilt angle were varied to obtain optimum weldment with no defect and high tensile strength, and then by adding zirconia nanoparticle to welding zone of optimum sample, the effects of pass number on microstructure, mechanical properties and wear characteristics of welded specimens were investigated. In order to investigate microstructure, optical and scanning electron microscope and atomic force microscope was used. Results showed that by increasing pass number, the distribution of nanoparticles in the matrix become more homogenous and grain size in the stir zone has considerably decreased. The reason of this phenomena could be attributed to the presence of reinforcement nanoparticles which it causes pinning the grain boundary, enhancing nucleation of new recrystallized grains and the effect on breaking of initial grains. The maximum microhardness and tensile strength of weldment were obtained for composite weldment after four pass of 111 Hv and 328.3 MPa, which these values were 24 and 26% higher than weldment without reinforcement. Wear resistance of the weldment was determined by pin on disk test and revealed that by increasing pass number of FSW, the wear resistance increased.

کلیدواژه‌ها English

Friction Stir Welding
Nano Particle
Pass Number
Mechanical properties
Microstructure
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مهندسی مکانیک مدرس
دوره 18، شماره 3
خرداد 1397
صفحه 219-227