Enabling high strength yet ductility in a refractory high-entropy alloy through oxygen-nitrogen synergistic effect

IF 8.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia Pub Date : 2025-06-07 DOI:10.1016/j.actamat.2025.121229

Xiaodi Wang , Tianxin Li , Dingfeng Xu , Yuan Wu , Qianqian Wang , Peter K. Liaw , Yiping Lu

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Abstract

Most refractory high-entropy alloys (RHEAs) are susceptible to brittle fracture when subjected to tensile loading. The TiZrHfNb RHEA and its derivative possess good tensile ductility, but still encounter issues with low yield strength. In this study, we propose an Oxygen-Nitrogen Synergistic Effect (ONSE) for reinforcing the TiZrHfNb RHEA. Oxygen atoms create local chemical order (LCO), seeding more dislocation nucleation sites, promoting dislocation multiplication and ensuring uniform deformation. Nitrogen atoms induce lattice distortion, hinder dislocation motion, and generate a significant solid solution strengthening effect. The introduction of ONSE results in high-density mobile dislocations distributed throughout the alloy, as opposed to the conventional belief that dislocations are limited to narrow slip bands by LCOs. The model alloy (TiZrHfNb)₉₈N_1.5O_0.5 (at. %) designed by ONSE showed a significantly improved yield strength of 1412.9 ± 13.5 MPa, representing a 92 % enhancement compared to the TiZrHfNb RHEA, while maintaining a fracture elongation of 10 %. Our strengthening approach provides a new option for improving the strength of other body-centered-cubic (BCC) RHEAs.

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通过氧氮协同效应使难熔高熵合金具有高强度和延展性

大多数难熔高熵合金（RHEAs）在拉伸载荷作用下易发生脆性断裂。TiZrHfNb RHEA及其衍生物具有良好的拉伸延展性，但仍存在屈服强度低的问题。在这项研究中，我们提出了氧氮协同效应（ONSE）来增强TiZrHfNb RHEA。氧原子创造局部化学秩序（LCO），播下更多位错成核位点，促进位错增殖，确保均匀变形。氮原子诱导晶格畸变，阻碍位错运动，产生显著的固溶强化效应。ONSE的引入导致高密度的移动位错分布在整个合金中，这与传统观点相反，即位错被lco限制在狭窄的滑移带中。ONSE设计的模型合金（TiZrHfNb）98N1.5O0.5 （at.%）的屈服强度显著提高，达到1412.9±13.5 MPa，与TiZrHfNb RHEA相比提高了92%，同时保持了10%的断裂伸长率。我们的强化方法为提高其他体心立方（BCC） RHEAs的强度提供了一种新的选择。

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

Acta Materialia 工程技术-材料科学：综合

CiteScore

16.10

自引率

8.50%

发文量

801

审稿时长

53 days

期刊介绍： Acta Materialia serves as a platform for publishing full-length, original papers and commissioned overviews that contribute to a profound understanding of the correlation between the processing, structure, and properties of inorganic materials. The journal seeks papers with high impact potential or those that significantly propel the field forward. The scope includes the atomic and molecular arrangements, chemical and electronic structures, and microstructure of materials, focusing on their mechanical or functional behavior across all length scales, including nanostructures.