Effects of Nitrogen Doping on Microstructures and Irradiation Resistance of Ti–Zr–Nb–V–Mo Refractory High-Entropy Alloy

IF 2.9 2区材料科学 Q2 METALLURGY & METALLURGICAL ENGINEERING

Acta Metallurgica Sinica-English Letters Pub Date : 2024-04-09 DOI:10.1007/s40195-024-01686-0

Huanzhi Zhang, Tianxin Li, Qianqian Wang, Zhenbo Zhu, Hefei Huang, Yiping Lu

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Abstract

Interstitial strengthening with nitrogen (N) is one of the effective ways to improve the mechanical properties of HEAs, but the effects of N on the microstructures and mechanical properties of the irradiated HEAs have not been studied extensively. Here, the microstructures and mechanical properties of N-free and N-doped Ti₂ZrNbV_0.5Mo_0.2 HEAs before and after He irradiation were investigated. The results showed that the solid solution strengthening caused by interstitial N improved the yield strength at room temperature and 1023 K without significantly reducing plasticity. N doping significantly promoted the growth, aggregation and wider spatial distribution of He bubbles by enhancing the mobility of He atoms/He-vacancy complexes, with the average size of He bubbles increasing from 10.4 nm in N-free HEA to 31.0 nm in N-doped HEA. In addition, N-doped HEA showed a much higher irradiation hardness increment and hardening fraction than N-free HEA. Contrary to conventional materials doped with N, the introduction of N into Ti₂ZrNbV_0.5Mo_0.2 HEA had adverse effects on its resistance to He bubble growth and irradiation hardening. The results of this study indicated that N doping may not improve the irradiation resistance of HEAs.

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掺氮对 Ti-Zr-Nb-V-Mo 高熵难熔合金微观结构和耐辐照性的影响

用氮（N）进行间隙强化是改善 HEA 力学性能的有效方法之一，但氮对辐照 HEA 的微观结构和力学性能的影响尚未得到广泛研究。本文研究了无 N 和 N 掺杂 Ti2ZrNbV0.5Mo0.2 HEA 在 He 辐照前后的微观结构和力学性能。结果表明，间隙 N 引起的固溶强化提高了室温和 1023 K 时的屈服强度，而塑性并没有显著降低。通过提高 He 原子/He 空位复合物的迁移率，掺杂 N 显著促进了 He 气泡的生长、聚集和更广泛的空间分布，He 气泡的平均尺寸从无 N HEA 的 10.4 nm 增加到 N 掺杂 HEA 的 31.0 nm。此外，与不含 N 的 HEA 相比，掺 N 的 HEA 显示出更高的辐照硬度增量和硬化分数。与掺杂 N 的传统材料相反，在 Ti2ZrNbV0.5Mo0.2 HEA 中引入 N 会对其抗 He 气泡生长和辐照硬化产生不利影响。这项研究的结果表明，掺入 N 并不能提高 HEA 的抗辐照性能。

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来源期刊

Acta Metallurgica Sinica-English Letters METALLURGY & METALLURGICAL ENGINEERING-

CiteScore

6.60

自引率

14.30%

发文量

122

审稿时长

2 months

期刊介绍： This international journal presents compact reports of significant, original and timely research reflecting progress in metallurgy, materials science and engineering, including materials physics, physical metallurgy, and process metallurgy.