اثر زمان آسیاکاری و بررسی تحلیل ترمودینامیکی بر تشکیل فاز آمورف در آلیاژ Fe-C-Ta تولید شده بهروش آلیاژسازی مکانیکی
الموضوعات : فصلنامه علمی - پژوهشی مواد نویناحسان بهادری یکتا 1 , امیرحسین تقوایی 2 , شهریار شرفی 3
1 - دانشجوی دکترای رشته مهندسی مواد و متالورژی دانشگاه شهید باهنر کرمان، کرمان، ایران
2 - استادیار، دانشکده مهندسی و علم مواد، دانشگاه صنعتی شیراز، شیراز، ایران
3 - استاد، دانشکده مهندسی مواد و متالورژی، دانشگاه شهید باهنر کرمان، کرمان، ایران
الکلمات المفتاحية: آلیاژسازی مکانیکی, آلیاژهای آمورف پایه آهن, مدل پیشرفته میدما,
ملخص المقالة :
امروزه مواد مغناطیسی نرم همچون آلیاژهای نانوساختار و آمورف بهدلیل خواص منحصر به فرد فیزیکی، مکانیکی و مغناطیسی بسیار مورد توجه قرار گرفتهاند. در سالهای اخیر، آلیاژهای آمورف پایه آهن به دلیل خواص مغناطیسی عالی درکنار هزینه نسبتا پایین گسترش زیادی یافتهاند. در این تحقیق، تاثیر زمان آسیاکاری بر روی میکروساختار آلیاژ Fe-C-Ta تولید شده بهروش آلیاژسازی مکانیکی بررسی شد. همچنین، امکان تشکیل فاز آمورف براساس تحلیل ترمودینامیکی طبق مدل پیشرفته میدما در سیستم آلیاژی فوق بررسی گردید. نتایج حاصل از پراش پرتو ایکس نشان داد که با افزایش زمان آسیاکاری تا 70 ساعت، درصد فاز آمورف افزایش یافته و ادامه آسیاکاری تا زمان90 ساعت منجر به تغییر محسوسی در مقدار این فاز نمیشود. همچنین، آنالیز گرماسنجی روبشی افتراقی تشکیل فاز آمورف با دمای تبلور K 678 را پس از 70 ساعت آسیاکاری تایید کرد. محاسبات ترمودینامیکی انجام شده براساس مدل پیشرفته میدما نشان داد که تغییرات انرژی آزاد گیبس جهت ایجاد فاز آمورف (kJ/mol 35/42-) بزرگتر از این تغییرات برای تشکیل محلول جامد (kJ/mol 5/28-) بوده و در نتیجه تمایل به تشکیل فاز آمورف در سیستم آلیاژی فوق پس از آسیاکاری بیشتر است.
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