Study on the microstructure and properties of co-free high-entropy alloys fabricated by laser melting deposition and processed by hot isostatic pressing

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials Letters Pub Date : 2025-06-20 DOI:10.1016/j.matlet.2025.138972

Xitong Guan , Xvteng Lv , Songtao Ji , Zhijie Han , Junhui Diao , Yongguang Gao , Qi Wu

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Abstract

In this study, laser melting deposition (LMD) was employed to fabricate Fe36Mn21Cr18Ni15Al10 high-entropy alloy (HEA), followed by hot isostatic pressing (HIP) treatment to optimize the microstructure and enhance ductility. The microstructural characteristics, phase composition, and mechanical properties of both as-deposited and as-HIPed HEAs were systematically investigated. The as-deposited specimen exhibited a BCC + B2 dual-phase structure with cellular microstructures, demonstrating a yield strength of 623.1 MPa, ultimate tensile strength of 671.2 MPa, and elongation of 3.82 %. After HIP treatment, the alloy transformed into an FCC + BCC(B2) dual-phase structure, achieving improved mechanical properties with yield strength of 600.5 MPa, ultimate tensile strength of 800.7 MPa, and significantly enhanced elongation of 20.7 %. This microstructural evolution and corresponding mechanical enhancement confirm the effectiveness of HIP in optimizing LMD-fabricated HEAs.

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激光熔化沉积和热等静压加工无共高熵合金的组织和性能研究

本研究采用激光熔化沉积（LMD）法制备Fe36Mn21Cr18Ni15Al10高熵合金（HEA），再进行热等静压（HIP）处理，优化组织，提高塑性。系统地研究了沉积态和hiped态HEAs的显微组织特征、相组成和力学性能。结果表明，该合金的屈服强度为623.1 MPa，极限抗拉强度为671.2 MPa，伸长率为3.82%，为BCC + B2双相组织，具有胞状组织。经HIP处理后，合金转变为FCC + BCC（B2）双相组织，屈服强度达到600.5 MPa，极限抗拉强度达到800.7 MPa，力学性能得到改善，伸长率显著提高20.7%。这种微观组织演变和相应的力学增强证实了HIP在优化lmd制造的HEAs中的有效性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Materials Letters 工程技术-材料科学：综合

CiteScore

5.60

自引率

3.30%

发文量

1948

审稿时长

50 days

期刊介绍： Materials Letters has an open access mirror journal Materials Letters: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. Materials Letters is dedicated to publishing novel, cutting edge reports of broad interest to the materials community. The journal provides a forum for materials scientists and engineers, physicists, and chemists to rapidly communicate on the most important topics in the field of materials. Contributions include, but are not limited to, a variety of topics such as: • Materials - Metals and alloys, amorphous solids, ceramics, composites, polymers, semiconductors • Applications - Structural, opto-electronic, magnetic, medical, MEMS, sensors, smart • Characterization - Analytical, microscopy, scanning probes, nanoscopic, optical, electrical, magnetic, acoustic, spectroscopic, diffraction • Novel Materials - Micro and nanostructures (nanowires, nanotubes, nanoparticles), nanocomposites, thin films, superlattices, quantum dots. • Processing - Crystal growth, thin film processing, sol-gel processing, mechanical processing, assembly, nanocrystalline processing. • Properties - Mechanical, magnetic, optical, electrical, ferroelectric, thermal, interfacial, transport, thermodynamic • Synthesis - Quenching, solid state, solidification, solution synthesis, vapor deposition, high pressure, explosive