مهندسی ساخت و تولید ایران

مهندسی ساخت و تولید ایران

بررسی خواص مکانیکی نانو کامپوزیت‌های تولید شده Al1050-CNT با استفاده از روش اتصال فشاری قالب تجمعی (ACCB)

نوع مقاله : مقاله پژوهشی

نویسندگان
1 استادیار، دانشکده فنی و مهندسی، دانشگاه آزاد اسلامی، واحد تبریز، تبریز، ایران
2 کارشناس ارشد، پژوهشکده رانشگرهای فضایی، پژوهشگاه فضایی ایران، تبریز، ایران
3 استادیار، پژوهشکده رانشگرهای فضایی، پژوهشگاه فضایی ایران، تبریز، ایران
چکیده
در تحقیق حاضر یک روش جدید تغییر شکل پلاستیک شدید به نام اتصال فشاری قالب تجمعی برای تولید نانوکامپوزیت‌‌های نانو لوله کربنیAl1050  ارائه شده است. ریزساختار و خواص مکانیکی آلومینیوم 1050 و همچنین کامپوزیت­های فرآوری شده با استفاده از میکروسکوپ الکترونی روبشی و تست کشش آنالیز شد. نتایج به‌دست‌آمده نشان داد که میانگین اندازه دانه آلومینیوم  پس از یک و دو سیکل از فرایند اتصال فشاری قالب تجمعی به ترتیب به محدوده‌­های 7 و 4 میکرومتر کاهش می‌یابد. کامپوزیت­های فرآوری شده و آلومنیوم 1050 تغییر شکل پلاستیکی همگن محدودی را نشان دادند که نشان دهنده ظرفیت محدود کارسختی به دلیل چگالی نابجایی بالا در طی فرایند اتصال فشاری قالب تجمعی است. همچنین استحکام کششی کامپوزیت­ های Al1050-CNT با افزایش سیکل­ های تغییر شکل افزایش یافت. همچنین نشان داده شد که مکانیسم­‌های مختلفی باعث بهبود خواص مکانیکی از جمله افزایش چگالی نابجایی و کسر تقویت‌کننده و کاهش اندازه دانه­‌ها با تغییر شکل پلاستیک هستند. سطح شکست حاصل از آزمون کشش ترکیبی از شکست شکل ­پذیر و شکننده در طول تغییر شکل کششی را نشان داد.
کلیدواژه‌ها

عنوان مقاله English

Fabrication and characterization of the mechanical properties of Al1050-CNT composites using accumulative channel-die compression bonding process

نویسندگان English

Hossein Jafarzadeh 1
Ehsan Shalchi 2
Moharram Shameli 3
1 Assistant Professor, Department of Mechanical Engineering, Islamic Azad University, Tabriz branch, Tabriz, Iran
2 MSc, Space Thruster Research Institute, Iran Space Institute, Tabriz, Iran
3 Assistant Professor, Space Thruster Research Institute, Iran Space Institute, Tabriz, Iran
چکیده English

In the present investigation a new severe plastic deformation method called accumulative channel-die compression bonding (ACCB) was adapted for fabrication of Al1050-carbon nanotube (CNT) composites. Microstructure and mechanical properties of Al1050 matrix material and synthesized composites were analyzed using SEM and tensile testing. The obtained results showed that the average grain size of matrix is reduced to 7 and 4 μm after one and two passes of ACCB respectively. Processed composites and Al1050 showed a limited homogeneous plastic deformation indicating the limited work hardening capacity due to the high dislocation densities developed during ACCB process. Also, the tensile strength of Al1050-CNT composites was increased with increase in deformation passes. It was demonstrated that different mechanisms are responsible for improved mechanical properties including the increase in dislocation density and reinforcement fraction and grain refinement by plastic deformation. Fractured surface were showed a combination of ductile and brittle failure during tensile deformation.

کلیدواژه‌ها English

Nanocomposite
Al1050-CNT Composite
ACCB
Mechanical Properties
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