Effect of hafnium and molybdenum addition on inclusion characteristics in Co-based dual-phase high-entropy alloys

Yong Wang; Wei Wang; Joo Hyun Park; Wangzhong Mu

doi:10.1007/s12613-024-2831-x

Volume 31 Issue 7

Jul. 2024

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Yong Wang, Wei Wang, Joo Hyun Park, and Wangzhong Mu, Effect of hafnium and molybdenum addition on inclusion characteristics in Co-based dual-phase high-entropy alloys, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1639-1650. https://doi.org/10.1007/s12613-024-2831-x

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Yong Wang, Wei Wang, Joo Hyun Park, and Wangzhong Mu, Effect of hafnium and molybdenum addition on inclusion characteristics in Co-based dual-phase high-entropy alloys, Int. J. Miner. Metall. Mater., 31(2024), No. 7, pp. 1639-1650. https://doi.org/10.1007/s12613-024-2831-x

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Research ArticleOpen Access

Effect of hafnium and molybdenum addition on inclusion characteristics in Co-based dual-phase high-entropy alloys

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Corresponding authors:
Wei Wang E-mail: wei6@kth.se

Wangzhong Mu E-mail: wmu@kth.se
Received: 27 July 2023; Revised: 14 January 2024; Accepted: 15 January 2024; Available online: 17 January 2024

Abstract

Abstract

Specific grades of high-entropy alloys (HEAs) can provide opportunities for optimizing properties toward high-temperature applications. In this work, the Co-based HEA with a chemical composition of Co_47.5Cr₃₀Fe_7.5Mn_7.5Ni_7.5 (at%) was chosen. The refractory metallic elements hafnium (Hf) and molybdenum (Mo) were added in small amounts (1.5at%) because of their well-known positive effects on high-temperature properties. Inclusion characteristics were comprehensively explored by using a two-dimensional cross-sectional method and extracted by using a three-dimensional electrolytic extraction method. The results revealed that the addition of Hf can reduce Al₂O₃ inclusions and lead to the formation of more stable Hf-rich inclusions as the main phase. Mo addition cannot influence the inclusion type but could influence the inclusion characteristics by affecting the physical parameters of the HEA melt. The calculated coagulation coefficient and collision rate of Al₂O₃ inclusions were higher than those of HfO₂ inclusions, but the inclusion amount played a larger role in the agglomeration behavior of HfO₂ and Al₂O₃ inclusions. The impurity level and active elements in HEAs were the crucial factors affecting inclusion formation.
- high-entropy alloy;
- non-metallic inclusion;
- agglomeration;
- thermodynamics;
- alloying

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