Non-Equilibrium Solidification Behavior and Microstructure Evolution of Undercooled Fe7(CoNiMn)80B13 Eutectic High-Entropy Alloy
Received date: 2024-04-16
Revised date: 2024-07-25
Online published: 2024-08-26
Supported by
National Natural Science Foundation of China(52201055);National Natural Science Foundation of China(52274401)
Eutectic high-entropy alloys show excellent properties, such as casting property, mechanical properties, corrosion resistance properties, and so on. They are usually consisted of two kinds of phases, which would be compete with each other in the non-equilibrium solidification process. Fe7(CoNiMn)80B13 eutectic high-entropy alloy has complex phase transition and microstructure evolution behavior during the non-equilibrium solidification process. In order to reveal the non-equilibrium solidification characteristics and microstructure evolution mechanism, Fe7(CoNiMn)80B13 eutectic high-entropy alloy was undercooled by the molten glass fluxing method in this work. The results show that the solidification path and microstructure of undercooled Fe7(CoNiMn)80B13 eutectic high-entropy alloy can be divided into 5 categories. At low undercooling (ΔT < 57 K), the cooling curve has only one recalescence phenomenon. The corresponding solidification microstructure is primary B-rich phase + peritectic α-(Fe, Co, Ni, Mn) phase + eutectic structure. At medium undercooling (ΔT = 57~111 K), there are two recalescence phenomena on the cooling curve. The corresponding solidification microstructure can be divided into two types: the first is primary M23B6 dendrite + secondary α-(Fe, Co, Ni, Mn) halo + regular eutectic; the second is primary α-(Fe, Co, Ni, Mn) dendrite + regular eutectic. At high undercooling (ΔT = 139~198 K), the cooling curve shows a single recalescence phenomenon again. The corresponding solidification microstructure can be divided into two types: the first is a mixture of B-rich phase + M23B6 + α-(Fe, Co, Ni, Mn) three phases, and the second is M23B6 + α-(Fe, Co, Ni, Mn) anomalous eutectic. Note that the type of primary phase transited for twice with the increase of undercooling: B-rich phase→M23B6 phase→α-(Fe, Co, Ni, Mn) phase. In addition, the orientation relationship of two eutectic phases in regular eutectic at low undercooling is consistent with that of two phases in anomalous eutectic at high undercooling.
WANG Yeqing , FU Ke , ZHAO Yongzhu , SU Liji , CHEN Zheng . Non-Equilibrium Solidification Behavior and Microstructure Evolution of Undercooled Fe7(CoNiMn)80B13 Eutectic High-Entropy Alloy[J]. Acta Metall Sin, 2025 , 61(1) : 143 -153 . DOI: 10.11900/0412.1961.2024.00111
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