Tailoring σ-phase precipitation for enhanced strength-plasticity in arc-based direct energy-deposited FeCoCrNiMnMo high-entropy alloy

IF 5.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Scripta Materialia Pub Date : 2025-07-25 DOI:10.1016/j.scriptamat.2025.116894

Fissha Biruke Teshome , Miao Zhao , Jiajia Shen , J.P. Oliveira , Chen Long , Jian Li , Bei Peng , N. Schell , Zhi Zeng

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Abstract

High-entropy alloys (HEAs) are novel materials with outstanding properties, showing potential for advanced engineering applications. Recent advancements in HEA design are complemented by studies correlating fabrication techniques to their performance. This study introduces the pioneering use of an ultra-high-frequency pulsed current (UHFPC) TIG heat source in directed energy deposition (DED) with dual alloy-wires for the fabrication of non-equiatomic FeCoCrNiMnMo HEAs. A comprehensive evaluation of the microstructural and mechanical behavior of as-deposited and heat-treated material, guided by CALPHAD methods, is presented. The use of UHFPC significantly refined the microstructure and promoted homogeneity, enabling the formation of a ductile FCC matrix in the as-deposited state. Subsequent heat-treatment induced recrystallization and σ-phase precipitation at the grain boundaries, enhancing strength via dislocation-precipitation strengthening synergy. The CALPHAD-informed heat-treatment led to ∼44.2 % and ∼33.4 % increase in yield and ultimate tensile strength, respectively, while preserving superior elongation (∼58 %), underscoring the potential of TIG-based-DED to fabricate HEA parts for advanced applications.

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电弧基直接能量沉积feccrnimnmo高熵合金中定制σ相析出提高强度塑性

高熵合金（HEAs）是一种性能优异的新型材料，具有先进的工程应用潜力。HEA设计的最新进展与制造技术与其性能的相关研究相辅相成。本研究介绍了超高频脉冲电流（UHFPC） TIG热源在双合金线定向能沉积（DED）中用于制造非等原子feccrnimnmo HEAs的开创性应用。在CALPHAD方法的指导下，对沉积态和热处理态材料的显微组织和力学行为进行了综合评价。UHFPC的使用显著改善了微观结构，促进了均匀性，使沉积状态下形成了韧性FCC基体。随后的热处理引起晶界处的再结晶和σ相析出，通过位错-析出强化协同作用来提高强度。calphad热处理使屈服强度和极限抗拉强度分别提高了44.2%和33.4%，同时保持了优异的伸长率（58%），强调了tig - ded在制造HEA零件方面的先进应用潜力。

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来源期刊

Scripta Materialia 工程技术-材料科学：综合

CiteScore

11.40

自引率

5.00%

发文量

581

审稿时长

34 days

期刊介绍： Scripta Materialia is a LETTERS journal of Acta Materialia, providing a forum for the rapid publication of short communications on the relationship between the structure and the properties of inorganic materials. The emphasis is on originality rather than incremental research. Short reports on the development of materials with novel or substantially improved properties are also welcomed. Emphasis is on either the functional or mechanical behavior of metals, ceramics and semiconductors at all length scales.