اثر افزودن عامل کنترل‌کننده بر ریزساختار و خواص مغناطیسی آلیاژ جدید آمورف/نانوبلور پایه آهن تولیدشده به‌روش آلیاژسازی مکانیکی

محورهای موضوعی : فصلنامه علمی - پژوهشی مواد نوین

احسان بهادری یکتا ¹ (دانشجوی دکترای رشته مهندسی مواد و متالورژی، دانشگاه شهید باهنر کرمان، کرمان، ایران)
امیر حسین تقوایی ² (استادیار، دانشکده مهندسی و علم مواد، دانشگاه صنعتی شیراز، شیراز، ایران)
شهریار شرفی ³ (استاد، دانشکده مهندسی مواد و متالورژی، دانشگاه شهید باهنر کرمان، کرمان، ایران)

تاریخ دریافت : 1397/02/15 تاریخ پذیرش : 1397/09/24 تاریخ انتشار : 1397/11/01

کلید واژه: آلیاژسازی مکانیکی, خواص مغناطیسی, آلیاژهای آمورف پایه آهن,

چکیده مقاله :

در سال‌های اخیر، آلیاژهای آمورف پایه آهن‌ به دلیل خواص مغناطیسی عالی درکنار هزینه نسبتاً پایین گسترش زیادی یافته‌اند. در این تحقیق، تاثیر افزودن عامل‌کنترل‌کننده (PCA) بر میکروساختار و خواص مغناطیسی آلیاژ آمورف پایه آهن Fe75Ta5Si10C10 تولید شده به‌ روش آلیاژسازی مکانیکی بررسی شد. نتایج حاصل از پراش پرتو ایکس نشان داد که تنها با افزودن 2% عامل کنترل کننده به آلیاژ فوق فاز آمورف تشکیل می شود، درحالیکه بدون افزودن عامل کنترل کننده هیچ هاله آمورفی مشاهده نشد. همچنین با افزایش زمان آسیاکاری تا مراحل پایانی (120 ساعت)، درصد وزنی فاز آمورف افزایش یافت و در نهایت به مقدار 94% رسید. تصویر میکروسکوپ الکترونی عبوری گرفته شده از نمونه 120 ساعت آسیاکاری شده تشکیل فاز آمورف را تائید کرد. نتایج نشان داد اندازه بلورک ها و کرنش شبکه پس از 50 ساعت آسیاکاری به‌ترتیب به10 نانومتر و 44/1% برای نمونه با PCA و 15 نانومتر و 37/1% برای نمونه بدون PCA رسید. تصاویر میکروسکوپ الکترونی روبشی ریزتر شدن ذرات پودر در اثر افزودن PCA را تائید کرد. با افزودن PCA به‌دلیل وجود عناصر غیرمغناطیسی بیشتر، مقدار مغناطش اشباع کمتری نسبت به حالت بدون PCA به ‌دست آمد. به علاوه، به‌دلیل وجود ناهمسانگردی بلوری کم و تشکیل فاز آمورف در اثر افزودن PCA، میدان پسماندزدای مغناطیسی کمتری حاصل و در نتیجه خواص مغناطیسی نرم بهبود یافت. بنابراین نتایج کلی این پژوهش، بهبود قابلیت شیشه‌ای شدن و خواص مغناطیسی نرم در اثر افزودن PCA می‌باشد.

چکیده انگلیسی:

Nowadays, Fe-based amorphous/nanocrystalline alloys have been greatly developed due to the excellent magnetic properties, as well as their relatively low cost. In this study, the effect of process control agent (PCA) addition on the microstructure and magnetic properties of Fe75Ta5Si10C10 alloy produced by mechanical alloying was investigated. The X-ray diffraction (XRD) results showed that the addition of 2 wt. % PCA notably increases the glass forming ability (GFA) in the present alloying system and the percentage of the amorphous phase eventually reaches a value of 94 wt.% after 120 h milling. The amorphization reaction upon addition of the PCA was further confirmed by the transmission electron microscopy (TEM) analyzes. The crystallite size and lattice strain after 50 h milling were calculated as 10 nm and 1.44% after PCA addition, and 15 nm and 1.37% before that, respectively. The scanning electron microscopy (SEM) results confirmed that the powder prepared with the PCA exhibits finer particles with a more spherical shape. Magnetic measurements demonstrated that that both saturation magnetization and coercivity decrease and the soft magnetic behavior is improved with the PCA addition. Therefore, overall results in this study contain improvement of glass forming ability and soft magnetic properties with the PCA addition.

منابع و مأخذ:

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