Enhancing mechanical property and corrosion resistance of Al0.3CoCrFeNi1.5 high entropy alloy via grain boundary engineering

IF 4.8 2区材料科学 Q1 MATERIALS SCIENCE, CHARACTERIZATION & TESTING Materials Characterization Pub Date : 2024-10-01 DOI:10.1016/j.matchar.2024.114420

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Abstract

In the present study, to improve the performances of Al_0.3CoCrFeNi_1.5 high entropy alloys (HEAs), grain boundary character distribution (GBCD) of Al_0.3CoCrFeNi_1.5 HEA has been optimized by an appropriate thermo-mechanical processing. The experiment results showed that the fraction of low-Σ coincidence site lattice (CSL) boundaries could reach approximately 80 % through cold rolling with deformation of 8 % and subsequent annealing at 1050 °C for 5 min. The reason for GBCD optimization could be attributed to sufficient strain-induced boundary migration (SIBM) or grain growth after recrystallization. While recrystallization is not favorable for optimizing GBCD. The mechanical properties and corrosion resistance have been enhanced, with a more pronounced improvement observed in the corrosion resistance. The corrosion current density i_corr of the GBEM specimen stands at 0.23 μA∙cm⁻², representing a reduction of 66 % in comparison to the BM specimen (0.68 μA∙cm⁻²). The improvement of corrosion resistance of Al_0.3CoCrFeNi_1.5 HEA resulted from the discontinuous random grain boundaries (RGBs) broken by the high fraction of low-ΣCSL boundaries, especially Σ3 boundaries suppressed the propagation of corrosion crack.

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通过晶界工程提高 Al0.3CoCrFeNi1.5 高熵合金的机械性能和耐腐蚀性能

在本研究中，为了提高 Al0.3CoCrFeNi1.5 高熵合金（HEAs）的性能，通过适当的热机械加工优化了 Al0.3CoCrFeNi1.5 HEA 的晶界特征分布（GBCD）。实验结果表明，通过变形量为 8% 的冷轧和随后在 1050 °C 下退火 5 分钟，低Σ共轭晶格 (CSL) 晶界的比例可达到约 80%。GBCD 优化的原因可能是再结晶后充分的应变诱导边界迁移（SIBM）或晶粒生长。而再结晶不利于 GBCD 的优化。机械性能和耐腐蚀性能都得到了提高，耐腐蚀性能的提高更为明显。GBEM 试样的腐蚀电流密度 icorr 为 0.23 μA∙cm-2，与 BM 试样（0.68 μA∙cm-2）相比降低了 66%。Al0.3CoCrFeNi1.5 HEA 耐腐蚀性能的提高源于不连续的随机晶界（RGB）被高比例的低ΣCSL 晶界打破，尤其是Σ3 晶界抑制了腐蚀裂纹的扩展。

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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.