Improving the ductility of high-strength NiAl-based high-entropy alloys by introducing hierarchical nanoscale phases

IF 5.5 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2025-02-01 Epub Date: 2024-12-29 DOI:10.1016/j.matchar.2024.114698

Xiaohong Wang, Zhixin Xu, Chenglei Guo, Huiqing Xie, Tengfei Ma, Ao Li

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Abstract

This work explored the possibility of using high-entropy alloys (HEAs) to balance the strength and ductility of NiAl-based alloys. A novel Ni₃₅Al₃₅Co₁₀Cr₁₀Fe₁₀ HEA and a Ni₃₅Al₃₅Co₁₀Cr₅Fe₁₅ HEA were designed, and their microstructures and mechanical properties were investigated. The microstructures of both systems are all columnar dendrites, while the secondary dendrite arm spacing changes from 26.8 μm to 55.61 μm. Many hierarchical nanoscale (Cr, Fe)-rich BCCs, Cr-rich precipitates and Fe-rich precipitates are also generated. Furthermore, transmission electron microscopy (TEM) revealed that the nanoscale precipitates maintained coherent interfaces, thus enhancing the strengthening effect on the NiAl-based HEAs, which exhibited exceptional mechanical properties, with an ultimate compressive strength of 1900.6 MPa and a reasonable strain of 26.5 %. The proposed as-cast alloy exhibited superior mechanical properties.

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通过引入分层纳米相提高高强度nial基高熵合金的延展性

本工作探索了利用高熵合金（HEAs）平衡nial基合金强度和延展性的可能性。设计了一种新型Ni35Al35Co10Cr10Fe10 HEA和Ni35Al35Co10Cr5Fe15 HEA，并对其组织和力学性能进行了研究。两种体系的显微组织均为柱状枝晶，次生枝晶臂间距为26.8 μm ~ 55.61 μm。同时还生成了许多纳米级（Cr, Fe）富bcc、富Cr沉淀和富Fe沉淀。透射电镜（TEM）分析表明，纳米级析出相保持了界面共格，增强了对nial基HEAs的强化作用，其抗压强度达到1900.6 MPa，合理应变为26.5%，具有优异的力学性能。所提出的铸态合金表现出优异的力学性能。

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来源期刊

Materials Characterization 工程技术-材料科学：表征与测试

CiteScore

7.60

自引率

8.50%

发文量

746

审稿时长

36 days

期刊介绍： Materials Characterization features original articles and state-of-the-art reviews on theoretical and practical aspects of the structure and behaviour of materials. The Journal focuses on all characterization techniques, including all forms of microscopy (light, electron, acoustic, etc.,) and analysis (especially microanalysis and surface analytical techniques). Developments in both this wide range of techniques and their application to the quantification of the microstructure of materials are essential facets of the Journal. The Journal provides the Materials Scientist/Engineer with up-to-date information on many types of materials with an underlying theme of explaining the behavior of materials using novel approaches. Materials covered by the journal include: Metals & Alloys Ceramics Nanomaterials Biomedical materials Optical materials Composites Natural Materials.