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Reza Beygi

Reza Beygi

Academic rank: Associate Professor
ORCID: https://orcid.org/0000-0002-0110-1642
Education: PhD.
ScopusId: 36337544600
Faculty: Engineering
Address: Arak University
Phone: 086-32625824

Research

Title
Thermodynamic Analysis of Solid Solution Formation in the Nanocrystalline W-Co-Si Ternary System by Mechanical Alloying
Type
JournalPaper
Keywords
Mechanical alloying Co3W2Si intermetallic compound Thermodynamics
Year
2017
Journal journal of advanced materials and processing
DOI
Researchers Majid Zarezadeh Mehrizi ، Reza Beygi

Abstract

Co3W2Si 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 Co3W2Si intermetallic phase after 50h 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 CoSi 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 Co3Si compound decreases Gibbs free energy change and a more stable structure is formed.