تأثیر افزودن اکسید سریم بر رفتار سایشی و خوردگی نانو کامپوزیت سطحی Al5083/CeO2 ساخته شده به روش فرآیند اصطکاکی اغتشاشی

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی و علم مواد، گروه مهندسی مواد، دانشگاه شهید چمران اهواز، ایران

چکیده

در تحقیق حاضر، نانو کامپوزیت سطحیAl5083/CeO2 با افزودن نانو ذرات اکسید سریم(CeO2) به سطح آلیاژ آلومینیم 5083 توسط فرآیند اصطکاکی اغتشاشی ایجاد گردید. ریزساختار، رفتار سایشی و خوردگی فلز پایه، نمونه­ تحت فرآیند بدون ذرات تقویت­کننده و کامپوزیت سطحی Al5083/CeO2 مورد بررسی قرار گرفت. بررسی­های ریزساختاری توزیع یکنواخت ذرات تقویت­کننده را در ناحیه­ اغتشاشی نشان داد. در مقایسه­ با فلز پایه، نمونه­ کامپوزیتی سختی بیشتر و خواص سایشی بهتری را در آزمون سایش از خود نشان داد. حضور نانو ذرات اکسید سریم در ناحیه­ تحت اغتشاش، سبب بهبود قابل ملاحظه­ خواص خوردگی، یعنی ایجاد ناحیه­ پسیو بزرگ و کاهش 95 درصدی چگالی جریان خوردگی(icorr) کامپوزیت حاصل نسبت به فلز پایه شد. نتایج بررسی­ها نشان داد که افزودن ذرات اکسید سریم موجب بهبود قابل ملاحظه رفتار سایشی و خوردگی آلیاژ 5083 بطور همزمان می­گردد.

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