پیش‌بینی ترمودینامیکی تشکیل درجای ترکیبات آلومینایدی Al3Ti, Al3Zr بر اساس مدل تغییرات انرژی آزاد گیبس موثر ("G" "e∆" ) در فرآیند اصطکاکی اغتشاشی

نوع مقاله : علمی و پژوهشی

نویسندگان

• مجتبی زادعلی محمدکوتیانی
• خلیل رنجبر

دانشگاه شهید چمران اهواز

10.22067/ma.v31i2.68080

چکیده

در این پژوهش، کامپوزیت‌های سطحی درجای زمینه آلومینیمی تقویت‌شده با ذرات آلومینایدی  و  توسط فرآیند اصطکاکی اغتشاشی (FSP) تولید شد. برای این کار از آلیاژ کارشده AA 3003-H14 به‌عنوان زمینه و نسبت مساوی از پودر فلزی زیرکنیم و تیتانیم به‌عنوان تقویت‌کننده استفاده گردید. برای توزیع بهتر ذرات تقویت‌کننده شش پاس فرآیند اعمال گردید. جهت بررسی ریزساختاری نمونه‌ها از روش میکروسکوپی الکترونی (SEM) و برای آنالیز فازی از تفرق اشعه ایکس (XRD) بهره گرفته شد. بررسی‌های ریزساختاری نشان داد که به‌دلیل واکنش‌های شیمیایی حالت جامد ترکیبات آلومینایدی  و  در فصل مشترک ذرات زیرکنیم و تیتانیم با زمینه آلومینیم تشکیل می‌شود. تشکیل ترکیبات آلومینایدی در مدت زمان کم‌تر از 40 ثانیه در این پژوهش به شرایط ترمومکانیکال فعال‌کننده‌ای که در حین فرآیند اصطکاکی اغتشاشی به‌وجود می‌آید نسبت داده شد. مدل تغییرات انرژی آزاد گیبس موثر ( ) جهت پیش‌بینی تشکیل ترکیبات آلومینایدی در فصل مشترک ذرات فلزی تقویت‌کننده با زمینه آلومینیمی استفاده شد که نتایج پیش‌بینی تطابق خوبی با نتایج تجربی به‌دست آمده داشت.

کلیدواژه‌ها

• فرآیند اصطکاکی اغتشاشی
• آلیاژ AA 3003-H14
• Ti
• مدل

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عنوان مقاله [English]

Thermodynamically Prediction of in-Situ Al3Ti, Al3Zr Aluminides Formation in Friction Stir Processing Based on Effective Gibbs Free Energy Change of Formation (〖"∆G" 〗^"e" ) Model

نویسندگان [English]

• Mojtaba Zadali Mohammad Kotiyani
• Khalil Ranjbar

Shahid Chamran University of Ahvaz

چکیده [English]

In this study, Al-surface composite reinforced by in-situ formed  and  aluminide particles was fabricated by using friction stir processing (FSP). A rolled AA 3003-H14 aluminum alloy sheet and equal proportion of Zirconium and Titanium metal powders as reinforcement were used to fabricate Al-surface composite. Six FSP passes were applied to improve the distribution of reinforcing particles. Microstructural examinations were performed using scanning electron microscopy (SEM) and phase analysis was done by an X-ray diffraction (XRD) technique. Microstructural investigation revealed that due to the solid state chemical reactions,  and  aluminides have formed at the interface between the metal powders and the aluminum alloy matrix. Formation of these aluminides with in the span time of less than 40 s, was attributed to the activated thermomechanical condition induced by FSP. The effective Gibbs free energy change of formation ( ) model was used to thermodynamically predict the aluminide phase formation at the interface between the matrix and the reinforcing metal particles. The results of prediction, matched well with the experimental observations.

کلیدواژه‌ها [English]

• Friction stir processing
• AA 3003-H14 alloy
• Al3Z
• Al3Ti مدل G∆
• ^"e" model

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