تاثیر سرعت انجماد بر خواص مکانیکی و خوردگی آلیاژهای زیست تخریب‌پذیر Zn-xAl

نوع مقاله : مقاله پژوهشی

نویسندگان

زینب احمدی

رضا تقی آبادی

مرتضی ثقفی یزدی

گروه مهندسی مواد، دانشگاه بین المللی امام خمینی (ره)

10.22067/jmme.2025.93286.1207

چکیده

در تحقیق حاضر، تاثیر سرعت انجماد (1/4 و 7/14 درجه سانتیگراد بر ثانیه) بر ریزساختار، خواص مکانیکی و رفتار خوردگی آلیاژهای زیست تخریب‌پذیر Zn-Al حاوی 5/0، 1، 2 و 4 درصد وزنی آلومینیم بررسی شده است. بر اساس نتایج به دست آمده، افزودن آلومینیم به روی خالص موجب توسعه ریزساختار متشکل از دندریت‌های غنی از روی (فاز ) و ساختار یوتکتوئید متشکل از فاز غنی از آلومینیم (α) و فاز غنی از روی  در نواحی بین دندریتی می‌شود. در سرعت انجماد 1/4 درجه سانتیگراد بر ثانیه آلیاژ Zn-4Al با استحکام کششی 321 مگاپاسکال و ازدیاد طول 2/16 درصد خواص مکانیکی معیار برای کاربردهای زیست پزشکی را محقق می‌کند اما با افزایش سرعت انجماد و بهبود خواص مکانیکی، آلیاژ Zn-2Al با استحکام کششی و درصد ازدیاد طول به ترتیب 330 مگاپاسکال و 24 درصد نیز قادر به تامین خواص مکانیکی معیار آلیاژهای زیست تخریب‌پذیر است. بر اساس نتایج آزمایش پلاریزاسیون تافل، در هر دو سرعت انجماد، افزودن آلومینیم تا 1 درصد وزنی موجب افزایش جریان و نرخ خوردگی روی خالص می‌شود. افزودن حدود 2 درصد وزنی آلومینیم تاثیری مثبت بر مقاومت به خوردگی دارد (چگالی جریان 6-10× 514/4 آمپر بر سانتیمتر مربع) اما افزایش بیشتر غلظت آلومینیم (تا 4 درصد وزنی) مجددا نرخ خوردگی را افزایش می‌دهد. کمترین نرخ خوردگی در آلیاژ Zn-2Al منجمد شده تحت سرعت 7/14 درجه سانتیگراد بر ثانیه مشاهده شد.

کلیدواژه‌ها

زیست تخریب پذیر

آلیاژ Zn-Al

سرعت انجماد

خواص مکانیکی

رفتار خوردگی

موضوعات

• ریخته گری و انجماد

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عنوان مقاله English

Effect of Solidification Rate on Mechanical and Corrosion Behavior of Zn-xAl Biodegradable Alloys

نویسندگان English

Zeynab Ahmadi

Reza Taghiabadi

Morteza Saghafi Yazdi

Department of materials science, Imam Khomeini International University

چکیده English

The effect of solidification cooling rate (4.1 and 14.7 °C/s) was studied on the microstructure, mechanical properties and corrosion behavior of biodegradable Zn-Al alloys containing 0.5, 1, 2 and 4 wt. % Al. According to the results, the addition of Al developed a microstructure comprising of Zn-rich dendrites (-phase) and Al-rich α-phase and -phase eutectoid in interdendritic regions. At the solidification rate of 4.1 °C/s, the Zn-4Al alloy with a tensile strength of 321 MPa and an elongation of 16.2 % fulfilled the benchmark mechanical properties of biomedical implants. Increasing the solidification cooling rate enhanced the mechanical properties where the Zn-2Al alloy with a tensile strength and elongation of 330 MPa and 24 %, respectively, fulfilled the benchmark mechanical properties of biodegradable alloys. According to the Tafel polarization tests, irrespective the cooling rate, the addition of 1 wt. % Al increased the corrosion rate/corrosion current of pure Zn. The addition of ~2 wt. % Al improved the corrosion resistance (corrosion current density of 4.51410-6 A/cm2), but its further increase to ~4 wt. % increased the corrosion rate again. The lowest corrosion rate was observed in the Zn-2Al alloy solidified at a cooling rate of 14.7 °C/s.

کلیدواژه‌ها English

Biodegradable

Zn-Al alloy

solidification cooling rate

mechanical properties

corrosion behavior

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