اثر زمان آسیاکاری و بررسی تحلیل ترمودینامیکی بر تشکیل فاز آمورف در آلیاژ Fe-C-Ta تولید شده به‌روش آلیاژسازی مکانیکی

فصلنامه علمی - پژوهشی مواد نوین

مقاله 10، دوره 8، شماره 31، اردیبهشت 1397، صفحه 107-122   

نوع مقاله: مقاله پژوهشی

نویسندگان

احسان بهادری یکتا¹؛ امیرحسین تقوایی^{* 2}؛ شهریار شرفی³

¹دانشجوی دکترای رشته مهندسی مواد و متالورژی دانشگاه شهید باهنر کرمان، کرمان، ایران

²استادیار، دانشکده مهندسی و علم مواد، دانشگاه صنعتی شیراز، شیراز، ایران

³استاد، دانشکده مهندسی مواد و متالورژی، دانشگاه شهید باهنر کرمان، کرمان، ایران

تاریخ دریافت: 29 اردیبهشت 1396،  تاریخ بازنگری: 22 شهریور 1396،  تاریخ پذیرش: 18 اردیبهشت 1397 

چکیده

     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. 

کلیدواژه‌ها

آلیاژهای آمورف پایه آهن؛ آلیاژسازی مکانیکی؛ مدل پیشرفته میدما

عنوان مقاله [English]

Effect of milling time and investigation of thermodynamic analysis on amorphous phase formation in Fe-C-Ta alloy prepared by mechanical alloying

نویسندگان [English]

E Bahadori yekta¹؛ A.H Taghvaei²؛ Sshahriyar Sharafi³

¹Department of Materials Science and Engineering, shahid bahonar University of kerman, kerman, Iran

²Department of Materials Science and Engineering, Shiraz University of Technology, Shiraz, Iran

³Department of Materials Science and Engineering, shahid bahonar University of kerman, kerman, Iran

چکیده [English]

Nowadays, soft magnetic materials such as nanocrystalline and amorphous alloys with unique physical, mechanical and magnetic properties have attracted much attention. Recently, Fe-based amorphous alloys have been greatly developed due to their excellent magnetic properties and relatively low cost. In this study, effect of milling time on microstructure of Fe-C-Ta alloy prepared by mechanical alloying was studied. Besides, the possibility of glass formation was investigated according to thermodynamic calculations, performed based on advanced Miedema model. The X-ray diffraction (XRD) results proposed that the fraction of amorphous phase enhances by increasing milling time up to 70 h, and then it becomes unchanged up to 90 h milling. Moreover, the differential scanning calorimetry (DSC) results confirmed the formation of amorphous phase with a crystallization temperature of 678 K, after 70 h of milling. The thermodynamic calculations with respect to the advanced Miedema model revealed that the Gibbs free energy changes for glass formation (-42.35 kJ/mol) are larger than those of solid-solution formation (-28.5 kJ/mol) and consequently, the amorphous phase has a larger tendency to form after milling.

کلیدواژه‌ها [English]

Fe-base amorphous alloys, mechanical alloying, advanced Miedema model

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