Impact of annealing on structural and corrosion resistance properties of Ti20Zr20Hf20Be20Ni20 high-entropy metallic glass

IF 9.6 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Rare Metals Pub Date : 2024-09-10 DOI:10.1007/s12598-024-02952-x

Ke-Ran Li, Pan Gong, Dong-Liang Wang, Cheng Zhang, Hu Huang, Muhammad Yasir, Mao Zhang, Xin-Yun Wang

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Abstract

This study comprehensively investigates the effects of annealing on the structural, electrochemical properties and passivation film characteristics of Ti₂₀Zr₂₀Hf₂₀Be₂₀Ni₂₀ (at%) high-entropy metallic glass (HE-MG). Subjected to various annealing temperatures, the samples were analyzed in a 3.5 wt% NaCl solution to evaluate changes in their microstructure and assess their corrosion resistance. Findings reveal that the HE-MG undergoes multistage crystallization, displaying an amorphous matrix integrated with face centered cubic (FCC) and Ni₇Zr₂ phases between 420 and 500 °C, indicating robust thermal stability. Electrochemical assessments identify a critical temperature threshold: Below the glass transition temperature (T_g), the HE-MG maintains excellent corrosion resistance, promoting stable passivation layers. Above T_g, enhanced long-range atomic rearrangement during relaxation increases passivation layer defects and significantly diminishes corrosion resistance. X-ray photoelectron spectroscopy (XPS) analyses show that the primary components of the passivation layer are TiO₂, ZrO₂, HfO₂ and BeO. Increased annealing temperatures lead to enhanced Be and Ni content and decreased Ti, Zr and Hf. Additionally, high mixing entropy and significant atomic size mismatch suppress long-range atomic rearrangement and crystallization. The crystallization begins above T_g by 20 °C, with crystalline phases evenly distributed within the matrix without drastically affecting corrosion resistance. This investigation highlights the impact of thermal treatment on the properties of HE-MG, contributing valuable insights into optimizing their performance and applications.

Graphical abstract

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退火对 Ti20Zr20Hf20Be20Ni20 高熵金属玻璃的结构和耐腐蚀性能的影响

本研究全面探讨了退火对 Ti20Zr20Hf20Be20Ni20 (at%) 高熵金属玻璃 (HE-MG) 的结构、电化学性能和钝化膜特性的影响。在不同的退火温度下，样品在 3.5 wt% 的氯化钠溶液中进行分析，以评估其微观结构的变化和耐腐蚀性。研究结果表明，HE-MG 经历了多级结晶，在 420 至 500 °C 之间显示出无定形基体与面心立方（FCC）和 Ni7Zr2 相的结合，这表明其具有很强的热稳定性。电化学评估确定了一个临界温度阈值：在玻璃化温度（Tg）以下，HE-MG 可保持优异的耐腐蚀性，促进稳定的钝化层。超过 Tg 时，弛豫过程中增强的长程原子重排会增加钝化层缺陷，并显著降低耐腐蚀性。X 射线光电子能谱（XPS）分析表明，钝化层的主要成分是 TiO2、ZrO2、HfO2 和 BeO。提高退火温度会导致 Be 和 Ni 含量增加，而 Ti、Zr 和 Hf 含量减少。此外，高混合熵和显著的原子尺寸失配抑制了长程原子重排和结晶。结晶开始于 20 °C Tg 以上，结晶相均匀地分布在基体中，不会对耐腐蚀性产生重大影响。这项研究强调了热处理对 HE-MG 性能的影响，为优化 HE-MG 的性能和应用提供了宝贵的见解。

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来源期刊

Rare Metals 工程技术-材料科学：综合

CiteScore

12.10

自引率

12.50%

发文量

2919

审稿时长

2.7 months

期刊介绍： Rare Metals is a monthly peer-reviewed journal published by the Nonferrous Metals Society of China. It serves as a platform for engineers and scientists to communicate and disseminate original research articles in the field of rare metals. The journal focuses on a wide range of topics including metallurgy, processing, and determination of rare metals. Additionally, it showcases the application of rare metals in advanced materials such as superconductors, semiconductors, composites, and ceramics.