اثر آلیاژسازی مکانیکی و عملیات حرارتی بر تغییر فاز مخلوط پودرهای Ni-Cr-Al
محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین
امیررضا شیرانی
1
,
علی شکوه فر
2
,
محمد حسین عنایتی
3
1 - نویسنده
2 - نویسنده
3 - نویسنده
کلید واژه: آلیاژسازی مکانیکی, مواد نانوساختار, ترکیب بین فلزی, CrNiAl,
چکیده مقاله :
در این کار پژوهشی، ترکیبات Ni50Al50 و Ni25Cr25Al50 (at%) مورد آلیاژسازی مکانیکی قرار گرفتند. تغییرات ساختاری ذرات پودر در طول آلیاژسازی مکانیکی به وسیله ی آزمون پراش پرتو ایکس (XRD) بررسی گردید. نتایج حاکی از تشکیل ترکیب بین فلزی نانوکریستال NiAl منظم از ترکیب Ni50Al50 پس از آلیاژسازی مکانیکی و ترکیب بین فلزی نانوکریستال NiCr)Al) از ترکیبNi25Cr25Al50 پس از آلیاژسازی مکانیکی و عملیات حرارتی بود. ریخت شناسی و ریزساختار ذرات پودر با میکروسکوپ الکترونی روبشی (SEM) مشخصه یابی شدند. نتایج نشان داد در مراحل نخستین آلیاژسازی مکانیکی ساختار لایه ای ازNi، Cr و Al تشکیل شده که با ادامه ی فرایند آلیاژسازی، این ساختار به محصول نهایی تغییر فاز داد.
In this study Ni50Al50 and Ni25Cr25Al50 were undergone mechanical alloying and heat treatment. The structural changes of powder particles during processes were studied by X-ray diffraction (XRD). It appeared that there are different phase transformations after both treatments: Ni50Al50 formed a nanocrystalline, orderly NiAl intermetallic compound; on the other hand (NiCr)Al intermetallic which itself was produced from Ni50Cr25Al25. The morphology and cross sectional area of the powder particles were characterized by scanning electron microscopy (SEM). The conclusion was that during initial stages of milling the layers of Cr, Ni, and Al are produced which subsequently are transformed into the final product upon further treatments.
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