Fe7(CoNiMn)80B13 共晶高熵合金的深过冷非平衡凝固行为及微观组织演变

doi:10.11900/0412.1961.2024.00111

金属学报

2025, Vol. 61

Issue (1): 143-153 DOI: 10.11900/0412.1961.2024.00111

研究论文

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Fe₇(CoNiMn)₈₀B₁₃ 共晶高熵合金的深过冷非平衡凝固行为及微观组织演变

王叶青, 付珂, 赵永柱, 苏礼季, 陈正(

)

中国矿业大学材料与物理学院徐州 221116

Non-Equilibrium Solidification Behavior and Microstructure Evolution of Undercooled Fe₇(CoNiMn)₈₀B₁₃ Eutectic High-Entropy Alloy

WANG Yeqing, FU Ke, ZHAO Yongzhu, SU Liji, CHEN Zheng(

)

School of Material Science and Physics, China University of Mining and Technology, Xuzhou 221116, China

引用本文:

王叶青, 付珂, 赵永柱, 苏礼季, 陈正. Fe₇(CoNiMn)₈₀B₁₃ 共晶高熵合金的深过冷非平衡凝固行为及微观组织演变[J]. 金属学报, 2025, 61(1): 143-153.
Yeqing WANG, Ke FU, Yongzhu ZHAO, Liji SU, Zheng CHEN. 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.

全文: PDF(3933 KB) HTML

摘要:

Fe₇(CoNiMn)₈₀B₁₃共晶高熵合金在非平衡凝固过程中存在复杂的相变及微观组织演变行为。为了揭示其非平衡凝固特征及组织演变机理，本工作采用熔融玻璃包覆法对Fe₇(CoNiMn)₈₀B₁₃共晶高熵合金进行了深过冷凝固，研究了该共晶高熵合金的深过冷凝固行为及微观组织演变特征。结果表明，Fe₇(CoNiMn)₈₀B₁₃共晶高熵合金在深过冷凝固过程中的凝固路径及凝固组织可以分为5类。在小过冷度下(ΔT < 57 K)，冷却曲线只有一次再辉现象，对应的凝固组织为初生富B相+ α-(Fe, Co, Ni, Mn)包晶相+共晶组织。在中等过冷度下(ΔT = 57~111 K)，冷却曲线上出现2次再辉现象，对应的凝固组织可以分为2种：第一种为初生M₂₃B₆枝晶+次生α-(Fe, Co, Ni, Mn)晕圈+规则共晶；第二种为初生α-(Fe, Co, Ni, Mn)枝晶+规则共晶。在大过冷度下(ΔT = 139~198 K)，冷却曲线再次表现出单再辉现象，对应的凝固组织也可以分为2种：第一种为富B相 + M₂₃B₆ + α-(Fe, Co, Ni, Mn)，3相各自存在；第二种为M₂₃B₆ + α-(Fe, Co, Ni, Mn)的反常共晶。随着过冷度的增加，初生相的种类发生了2次转变：富B相→M₂₃B₆相→α-(Fe, Co, Ni, Mn)相。另外，小过冷度下获得的规则共晶中共晶2相的取向关系与大过冷度下获得的反常共晶中共晶2相的取向关系一致。

关键词 ：共晶高熵合金, 深过冷凝固, 非平衡凝固行为, 微观组织, 凝固路径

Abstract：

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.

Key words： eutectic high-entropy alloy undercooling solidification non-equilibrium solidification behavior microstructure solidification path

收稿日期: 2024-04-16

ZTFLH:

TG21

基金资助:国家自然科学基金项目(52201055);国家自然科学基金项目(52274401)

通讯作者: 陈正，chenzheng1218@163.com，主要从事金属非平衡凝固与材料成型加工研究

Corresponding author: CHEN Zheng, professor, Tel: 13655207199, E-mail: chenzheng1218@163.com

作者简介: 王叶青，女，1991年生，博士

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https://www.ams.org.cn/CN/10.11900/0412.1961.2024.00111 或 https://www.ams.org.cn/CN/Y2025/V61/I1/143

图1 Fe7(CoNiMn)80B13共晶高熵合金深过冷过程中的几种典型温度-时间关系图

图2 铸态和不同过冷度(ΔT)下Fe7(CoNiMn)80B13共晶高熵合金的XRD谱

图3 ΔT = 23 K下Fe7(CoNiMn)80B13共晶高熵合金的SEM背散射电子(BSE)像及EDS线扫描图

表1 不同过冷度Fe7(CoNiMn)80B13共晶高熵合金的EDS分析结果 (atomic fraction / %)

图4 在中等和大过冷度下Fe7(MnCoNi)80B13共晶高熵合金的SEM-BSE像

图5 ΔT = 57 K时Fe7(CoNiMn)80B13共晶高熵合金中共晶组织的EBSD分析

图6 ΔT = 198 K时Fe7(CoNiMn)80B13共晶高熵合金中反常共晶组织的EBSD分析

图7 在不同过冷度下Fe7(CoNiMn)80B13共晶高熵合金表面的宏观固-液界面形貌

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