مهندسی مکانیک مدرس

مهندسی مکانیک مدرس

ساخت و بررسی خواص مکانیکی کامپوزیت آلومینیوم 6061- دی‌بوراید تیتانیم- گرافن تولیدشده با فرآیند اصطکاکی- اغتشاشی

نوع مقاله : پژوهشی اصیل

نویسندگان
دانشکده فنی و مهندسی، دانشگاه خلیج فارس، بوشهر، ایران
چکیده
در این پژوهش تولید و بررسی خواص مکانیکی کامپوزیت آلومینیم ۶۰۶۱ تقویت‌شده با پودرهای تکی و هیبریدی دی‌بوراید تیتانیم و گرافن به روش اصطکاکی اغتشاشی بررسی شده است. از میکروسکوپ نوری، الکترونی روبشی مجهز به طیف‌سنج پراش انرژی اشعه ایکس و آنالیز پراش‌سنجی اشعه ایکس برای شناسایی ریزساختار و فازهای موجود استفاده شد. خواص مکانیکی نمونه‌ها به وسیله آزمون کشش و سختی‌سنجی بررسی شد. در میان نمونه‌های تقویت‌شده با دی‌بوراید تیتانیم و گرافن به صورت تکی، به ترتیب نمونه با wt%۲۰ دی‌بوراید تیتانیم و نمونه با wt%۱ گرافن بالاترین خواص مکانیکی را نشان دادند. همچنین بین تمامی نمونه‌ها بالاترین خواص مکانیکی مربوط به نمونه تقویت‌شده با پودرهای هیبریدی شامل wt%۲۰ دی‌بوراید تیتانیم و wt%۱ گرافن است و استحکام تسلیم و نهایی این نمونه به ترتیب از ۷۵ و Mpa۱۶۰ (مربوط به آلیاژ آلومینیم ۶۰۶۱ اولیه) به ۱۹۱ و Mpa۲۷۱ افزایش یافت. همچنین میانگین سختی این نمونه در ناحیه همزده‌شده برابر VHN۱۰۱ است که نسبت به آلیاژ اولیه (VHN۶۲) و نمونه اصطکاکی اغتشاشی‌شده بدون پودر (VHN۷۱) افزایش چشم‌گیری نشان داد.
کلیدواژه‌ها

موضوعات


عنوان مقاله English

Fabrication and Mechanical Characterization of TiB2-Graphene Reinforced AA 6061 Composite by Friction Stirr Processing

نویسندگان English

M. Nazari
H. Eskandari
M.R. Golbaharhaghighi
Engineering Faculty, Persian Gulf University, Bushehr, Iran
چکیده English

In this research, friction stir processing was used to produce mono and hybrid surface composite layers of aluminum matrix containing TiB2 and graphene particles. Microstructural evaluation of the samples was performed by optical microscopy and field emission scanning electron microscopy of the composite samples cross-sections. The mechanical properties of the samples were investigated using microhardness and tension tests. Among the samples reinforced with TiB2 and graphene, the samples with 20wt% TiB2 and 1wt% graphene exhibited the highest hardness and strength compared to other samples. Aso, the highest mechanical properties are observed in the sample reinforced with hybrid powders include 20wt% TiB2 and 1wt% graphene. The yield and ultimate strength of the sample increased from 75 and 160MPa (corresponding to the initial 6061 AA) to 191 and 271MPa, respectively. Also, the average hardness of this sample in the stir zone is equal to VHN101 which was significantly higher than the initial alloy (VHN62) and the non-powdered friction-stir sample (VHN71).

کلیدواژه‌ها English

AA6061 Alloy
Graphene
Titanium Diboride (TiB2)
Composite
Mechanical properties
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