مهندسی متالورژی

مهندسی متالورژی

اثر افزودن زیرکونیوم و اعمال عملیات ترمومکانیکی بر ریزساختار، سختی و هدایت الکتریکی آلیاژ Cu-Ni-Co-Si

نویسندگان
دانشگاه تربیت‌مدرس
10.22076/me.2026.743587
چکیده
در این پژوهش، اثر افزودن مقدار جزیی عنصر زیرکونیوم و مسیر ترمومکانیکی بر تحول ریزساختار، رفتار پیرسختی و هدایت الکتریکی آلیاژ Cu–Ni–Co–Si بررسی شد. دو آلیاژ Cu–Ni–Co–Si و Cu–Ni–Co–Si–Zr در مراحل مختلف مسیر ترمومکانیکی طراحی شده مورد ارزیابی قرار گرفتند. نتایج نشان داد شرایط بهینه پیرسختی برای هر دو آلیاژ در دمای C°500 و زمان 5/0 ساعت حاصل می‌شود. بیشینه سختی آلیاژ بدون زیرکونیم برابر با Hv 276 و آلیاژ حاوی زیرکونیوم برابر با Hv 259 به‌دست آمد. تحلیل پراش پرتو ایکس، تشکیل رسوبات بین‌فلزی (Ni,Co)₂Si را در هر دو آلیاژ تأیید کرد. هدایت الکتریکی آلیاژ حاوی زیرکونیوم به 41% IACS رسید که نسبت به آلیاژ پایه با 39% IACS مقدار بالاتری است. نتایج نشان می‌دهد افزودن زیرکونیوم با تأثیر بر رفتار رسوب‌زنی، موجب افزایش رسانایی و کاهش نسبی سختی می‌شود. دو آلیاژ مورد بررسی پس از اعمال عملیات ترمومکانیکی خواص مکانیکی و الکتریکی مطلوبی را برای کاربردهای صنعتی از خود نشان دادند.
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