Thermodynamic analysis of nanocrystalline solid solution formation in the W-Co-Si ternary system by mechanical alloying
Publish Year: 1396
نوع سند: مقاله ژورنالی
زبان: English
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شناسه ملی سند علمی:
JR_JMATPR-5-3_003
تاریخ نمایه سازی: 12 مهر 1400
Abstract:
Co۳W۲Si intermetallic compound was synthesized by mechanical alloying (MA) of W, Co and Si elemental powder mixtures. The phase composition of the milled products was evaluated by X-ray diffraction (XRD) analysis. Morphological evolutions were characterized by transmission electron microscopy (TEM). The results showed that high energy ball milling performed in the present work led to the formation of Co۳W۲Si intermetallic phase after ۵۰h MA. A thermodynamic analysis of the process was then carried out using Miedema model. The thermodynamic results showed that there exists a positive thermodynamic driving force in W–Si and Co-Si binary systems and W-Co-Si ternary system to form a solid solution at all compositions but Gibbs free energy change in Co-W binary system is positive for solid solution formation. So that, there is no thermodynamic force to form a solid solution in Co-W system. In Co-W-Si ternary system, the addition of elemental W to Co۳Si compound decreases Gibbs free energy change and more stable structure forms.
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Authors
Majid zarezadeh
Department of material engineering, arak university
Reza Beygi
Department of Materials Engineering and Metallurgy, Faculty of Engineering, Arak University, Arak ۳۸۱۵۶-۸-۸۳۴۹, Iran