Superior hydrogen embrittlement resistance of CoCrNi-based medium-entropy alloy via coherent precipitation and grain boundary strengthening

IF 7.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Corrosion Science Pub Date : 2024-09-24 DOI:10.1016/j.corsci.2024.112483

Saiyu Liu , Zhao Xu , Yujie Zhu , Rongjian Shi , Kewei Gao , Xiaolu Pang

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Abstract

The strength and HE resistance of CoCrNi-based medium-entropy alloys were simultaneously improved via adding 264 at.ppm boron and the precipitation of nanoscale coherent L1₂ (γ'-type) particles. After aging treatment, the proportion of intergranular cracking decreased from 58.2 % in the solution-treated alloy to 27.6 %. Meanwhile, the yield strength increased by 102 %, and the ductility decreased by only 35.9 %. Notably, the elongation loss is only 9.4 %. On one hand, the added boron segregates to the grain boundaries (GBs), enhance the GB cohesive strength. On the other hand, precipitated L1₂ captures H, thereby reducing the concentration of diffusible H in the matrix and decelerating the diffusion rate of H. During plastic deformation, the L1₂ particles impedes the movement of dislocations and reduces stress concentration at GBs. This is associated with the presence of a completely coherent interface between the precipitated phase and face centered cubic matrix. This research provides insights into the beneficial effects of L1₂ phase precipitation and GB boron segregation on the HE resistance of M/HEAs.

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通过相干析出和晶界强化提高钴铬镍基中熵合金的抗氢脆性能

通过添加 264 at.ppm 硼和析出纳米级相干 L12（γ'型）颗粒，钴铬镍基中熵合金的强度和抗高热性能同时得到了改善。经过时效处理后，晶间开裂的比例从溶液处理合金的 58.2% 降至 27.6%。同时，屈服强度提高了 102%，延展性仅降低了 35.9%。值得注意的是，伸长率损失仅为 9.4%。一方面，添加的硼偏析到晶界（GBs），增强了 GB 的内聚强度。另一方面，析出的 L12 能捕获 H，从而降低基体中可扩散 H 的浓度，减缓 H 的扩散速度。在塑性变形过程中，L12 颗粒阻碍了位错的移动，降低了 GB 处的应力集中。这与析出相与面心立方体基体之间存在完全一致的界面有关。这项研究深入探讨了 L12 相析出和 GB 硼偏析对 M/HEAs 抗高热性能的有利影响。

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来源期刊

Corrosion Science 工程技术-材料科学：综合

CiteScore

13.60

自引率

18.10%

发文量

763

审稿时长

46 days

期刊介绍： Corrosion occurrence and its practical control encompass a vast array of scientific knowledge. Corrosion Science endeavors to serve as the conduit for the exchange of ideas, developments, and research across all facets of this field, encompassing both metallic and non-metallic corrosion. The scope of this international journal is broad and inclusive. Published papers span from highly theoretical inquiries to essentially practical applications, covering diverse areas such as high-temperature oxidation, passivity, anodic oxidation, biochemical corrosion, stress corrosion cracking, and corrosion control mechanisms and methodologies. This journal publishes original papers and critical reviews across the spectrum of pure and applied corrosion, material degradation, and surface science and engineering. It serves as a crucial link connecting metallurgists, materials scientists, and researchers investigating corrosion and degradation phenomena. Join us in advancing knowledge and understanding in the vital field of corrosion science.