Computation of the thermodynamic parameters of Sm–Co–Fe ternary alloys
Year: 2025
Type: article
Abstract: This study evaluated the thermodynamic parameters of Sm–Co, Sm–Fe and Co–Fe binary alloys using the Miedema model. The Miedema and Toop models were then combined to obtain the mixing enthalpy (Δ H ), excess entropy ( S E ), excess Gibbs free energy ( G E ) and activity ( α ) of Sm–Co–Fe ternary alloys. The findings indicate that the Δ H , S E and G E values of all binary alloys were negative. The Co and Fe elements have similar properties are similar, but they are different from Sm elements. Moreover, the Δ H , S E and G E values of the ternary alloys were negative at all molar fractions x i ( i = Sm, Co or Fe), with the minimum values of Δ H , G E , S E being −15.3139, −20.2879 and −2.6556 J molK −1 at x Sm = 46%, x Co = 54% and x Fe = 0%. The iso-activity curves illustrated a marked reduction in the activities of Sm, Co and Fe as their mole fractions decreased. Furthermore, Sm and Co exhibited lower activities within the ternary alloys than Fe, indicating that these elements more likely formed intermetallic compounds than Fe. This study provides important insights into the thermodynamics of Sm–Co–Fe ternary alloys and guides the development of ternary alloys.
Source: Materials Research Express
Authors: Zhi Zhu, Yikun Fang, Wei Wu, Bo Zhao, Jiashuo Zhang, Ming Lei
Institution: China Iron and Steel Research Institute Group
Language: English
Subfield: Mechanical Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,000
OpenAlex ID: W4408932621