نشریه مهندسی مکانیک امیرکبیر

نشریه مهندسی مکانیک امیرکبیر

بکارگیری هیدروکسی‌آپاتایت در استحکام‌بخشی به بیوکامپوزیت پایه منیزیمی تحت فرایند تغییر شکل پلاستیک شدید

نوع مقاله : مقاله پژوهشی

نویسندگان
دانشکده مهندسی مکانیک، دانشگاه علم و صنعت ایران، تهران، ایران
چکیده
بیوکامپوزیت‌های فلزی به دلیل بهره‌مندی از خواص هر دو فاز ماتریس و تقویت‌کننده، امروز مورد توجه قرار گرفته‌اند. در این بین، بیوکامپوزیت‌های منیزیمی به دلیل خواص زیست سازگاری، زیست تجزیه پذیری مورد توجه قرار گرفته است. با این وجود، ضعف خواص مکانیکی این نوع کامپوزیت‌ها، سبب شده است برای افزایش استحکام، فرایندهای اصلاحی بر روی آن‌ها صورت پذیرد. فرایند پرس‌کاری کانال همسان زاویه‌دار (ECAP) یکی از روش‌های فرایند تغییر شکل پلاستیک شدید (SPD) می‌باشد که به ریزدانه شدن و بهبود خواص مکانیکی مواد کمک می‌کند. لذا در این پژوهش به مطالعه فرایند پرس‌کاری در کانال همسان زاویه‌دار بر خواص مکانیکی و ریزساختار بیوکامپوزیت منیزیم/هیدروکسی آپاتایت 2/5 درصد وزنی پرداخته شده است. نمونه‌ها ابتدا با استفاده از روش ریخته‌گری همزنی مغناطیسی مکانیکی و پس از آن، دو پاس فرایند اکستروژن گرم، تحت فرایند ECAP در دمای 325 درجه سانتی‌گراد و روش BC با زاویه 90=φ مورد آزمایش قرار گرفتند. نتایج نشان می‌دهد که با افزایش تعداد پاس‌های فرایند ECAP، ساختار ریزدانه شده و دانه‌ها در مقیاس نانومتری تشکیل می‌شوند. همچنین بهبود استحکام مکانیکی به میزان 33% نسبت به منیزیم خالص و 15% نسبت به بیوکامپوزیت منیزیم/هیدروکسی آپاتایت دو مرحله اکستروژن مشاهده شد. آزمون میکروسختی نیز 50% نسبت به منیزیم خالص و 25% نسبت به بیوکامپوزیت منیزیم/هیدروکسی آپاتایت دو مرحله اکستروژن افزایش را نشان داد.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Reinforcement of Magnesium-Matrix Biocomposites with Hydroxyapatite during Severe Plastic Deformation

نویسندگان English

Seyed Ashkan Ghoreishizade
Hadi Allaei Oregani
Mohammad Sedighi
Department of Mechanical Engineering, Iran University of Science and Technology, Tehran, Iran
چکیده English

Metal biocomposites have garnered significant attention due to their combined benefits from both the matrix and reinforcement phases. Among these, magnesium-based biocomposites have been particularly emphasized in medical applications such as orthopedics and cardiovascular implants owing to their biocompatibility, biodegradability. However, the inferior mechanical properties of these composites have necessitated modifications to enhance their strength. Equal-Channel Angular Pressing (ECAP) is one of the Severe Plastic Deformation (SPD) techniques that contributes to grain refinement and the improvement of mechanical properties. Accordingly, this research investigates the effect of ECAP on the mechanical properties and microstructure of a magnesium/2.5 wt.% hydroxyapatite biocomposite. The samples were initially fabricated via mechanical magnetic stir casting followed by two passes of hot extrusion. They were then subjected to ECAP processing at 325°C using route BC with a channel angle of φ = 90°. The results indicate that increasing the number of ECAP passes leads to grain refinement and the formation of nanostructured grains. Moreover, a 33% improvement in mechanical strength compared to pure magnesium and a 15% enhancement compared to the twice-extruded magnesium/hydroxyapatite biocomposite were observed. Microhardness tests also revealed a 50% increase compared to pure magnesium and a 25% increase compared to the twice-extruded magnesium/hydroxyapatite biocomposite.

کلیدواژه‌ها English

Magnesium Biocomposite
Hydroxyapatite Reinforcement
Equal-Channel Angular Pressing (ECAP)
Mechanical Properties
Microstructure
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