通过Co/Ni比和层错能调控，实现twip辅助Fe25CoxCr25Ni50-x高熵合金优异的强度-塑性协同效应

IF 7 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Science and Engineering: A Pub Date : 2025-09-26 DOI:10.1016/j.msea.2025.149180

Liang Liu , Lei Tang , Shaoxu Huang , Lu Liu , Linfeng Ji , Guofu Xu

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引用次数: 0

摘要

feccrni高熵合金的室温强度往往不足，这限制了其在结构上的应用。通过控制Co/Ni比，设计出非等摩尔Fe25Co30Cr25Ni20合金，与Co/Ni比较低的合金相比，其屈服强度（提高24%，达到431 MPa），极限抗拉强度（提高29%，达到832 MPa）和延展性（提高27%，达到62%伸长率）同时提高。这一突破可归因于Co/ ni诱导的层错能（SFE）的降低，通过热力学模型（从~ 42.6 mJ/m2到~ 17.0 mJ/m2）和x射线衍射线剖面分析（从~ 24.25 mJ/m2到~ 14.56 mJ/m2）定量确定。降低SFE后，退火孪晶面积分数提高了38.8%，变形孪晶面积分数提高了38.8%，强化了应变硬化行为。定量强化分析证实了细化有效晶粒尺寸为3.9 μm时的Hall-Petch强化和初始密度为5.9 × 1013 m−2时的位错强化的协同作用，与实验结果吻合良好。本工作建立了Co/Ni比率为中介的SFE设计策略，用于开发具有显著强度-塑性组合的多组分合金。

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Achieving excellent strength-ductility synergy in TWIP-assisted Fe25CoxCr25Ni50-x high-entropy alloys via Co/Ni ratio and stacking fault energy manipulation

FeCoCrNi high-entropy alloys frequently suffer from inadequate room-temperature strength, which imposes limitations on structural applications. By manipulating the Co/Ni ratio, a non-equimolar Fe₂₅Co₃₀Cr₂₅Ni₂₀ alloy was designed with simultaneously enhanced yield strength (increase by 24 %, to 431 MPa), ultimate tensile strength (increase by 29 %, to 832 MPa), and ductility (increase by 27 %, to 62 % elongation) compared to a lower Co/Ni ratio counterpart. This breakthrough can be attributed to the Co/Ni-induced reduction in stacking fault energy (SFE), which was quantitatively determined though thermodynamic model (from ∼42.6 mJ/m² to ∼17.0 mJ/m²) and X-ray diffraction line profile analysis (from ∼24.25 mJ/m² to ∼14.56 mJ/m²). The lowered SFE promoted a 38.8 % annealing twin area fraction and intensified deformation twin fraction, synergistically enhancing strain hardening behaviors. Quantitative strengthening analysis confirms the synergy of Hall-Petch strengthening from a refined effective grain size of 3.9 μm and dislocation strengthening from an initial density of 5.9 × 10¹³ m⁻², aligning well with experimental measurements. This work establishes a Co/Ni ratio mediated SFE design strategy for developing multicomponent alloys with remarkable strength-ductility combinations.

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来源期刊

Materials Science and Engineering: A 工程技术-材料科学：综合

CiteScore

11.50

自引率

15.60%

发文量

1811

审稿时长

31 days

期刊介绍： Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.