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| Thermodynamic Study of CoCrFeNiMn High-Entropy Alloy |
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Received:February 02, 2023
Revised:February 06, 2023
Accepted:February 07, 2023
Published Online:June 25, 2023
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| DOI： |
| KeyWord:CoCrFeNiMn; high-entropy alloy; modified M-MIVM; thermodynamic properties; phase stability |
| Author | Institution |
| liuzhennan |
Kunming Metallurgy College |
| sunying |
Kunming Metallurgy College |
| yaochunlin |
Kunming Metallurgy College |
| liucong |
Kunming Key Laboratory of Comprehensive Utilization Resources of Rare and Precious Metals |
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| Abstract: |
| Thermodynamic properties play an important role in the design of high-entropy alloys. It has become an important and effective way to use reliable thermodynamic models for theoretical calculation to obtain key thermodynamic data of alloys. The modified M-MIVM (Molecular Interaction Volume Model) has a solid physical basis and is suitable for the thermodynamic study of high-entropy alloys with simple solid solution phase. A significant advantage of this model lies in its can use either the relevant binary infinite dilution activity coefficients or binary activity to describe and predict the thermodynamic properties of the binary or multi-component solid solutions. In this paper, the existing binary thermodynamic data and the modified M-MIVM are used to predict the Gibbs free energy of mixing, enthalpy of mixing, entropy of mixing, excess Gibbs free energy and excess entropy of the CoCrFeNiMn high-entropy alloy solid solution. At the same time, considering the difference of atomic size, the possibility of the formation of the high-entropy alloy, phase stability and structural stability composition are evaluated from the thermodynamic point of view. The results show that the CoCrFeNiMn system meets the thermodynamic criteria of high-entropy alloy and is easy to form a five-element high-entropy alloy; Under the conditions of low iron content, high nickel content and high manganese content, the Gibbs free energy of mixing of the alloy system is more negative and the structure is more stable; Co0.15Cr0.15Fe0.1Ni0.3Mn0.3 is a better alloy composition design scheme; At high temperature, the Gibbs free energy of mixing of the alloy system decreases significantly and the stability of the alloy increases. This study can provide reliable thermodynamic data and theoretical guidance for the design of CoCrFeNiMn high-entropy alloys. |
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