Abstract This paper reports on the corrosion behavior of three TiTaHf-based high entropy alloys (HEAs) in simulated body fluid (SBF) and artificial saliva (AS) in order to assess their potential utility as implant materials. Specifically, TiTaHfNb, TiTaHfNbZr and TiTaHfMoZr HEAs were subjected to static immersion experiments in SBF and AS, and both the surfaces of the samples and the immersion fluids were thoroughly examined with the state of the art techniques. The experimental results presented herein revealed that the presence of Zr and Nb in the TiTaHf-based samples enhanced corrosion performance with reduced ion release and better surface properties, while Mo addition resulted in an inhomogeneous microstructure, leading to dendrite structures and significant amount of ion release upon immersion in both media. Furthermore, a protective passive layer formation or crystallization was present on all HEA surfaces, implying that corrosion resistance can be sustained in long-term applications. Overall, the set of findings presented herein constitute an early indication of the potential of the TiTaHf-based HEAs to be utilized as implant materials.

中文翻译：

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用于医疗植入物的新型钛基高熵合金的腐蚀行为

摘要 本文报告了三种 TiTaHf 基高熵合金 (HEA) 在模拟体液 (SBF) 和人工唾液 (AS) 中的腐蚀行为，以评估它们作为植入材料的潜在效用。具体而言，TiTaHfNb、TiTaHfNbZr 和 TiTaHfMoZr HEAs 在 SBF 和 AS 中进行了静态浸没实验，并使用最先进的技术彻底检查了样品的表面和浸没液。本文提供的实验结果表明，TiTaHf 基样品中 Zr 和 Nb 的存在增强了腐蚀性能，减少了离子释放和更好的表面性能，而添加 Mo 导致微观结构不均匀，导致枝晶结构和大量离子释放沉浸在两种媒体中。此外，所有 HEA 表面都存在保护性钝化层形成或结晶，这意味着在长期应用中可以保持耐腐蚀性。总体而言，本文提出的一组发现构成了基于 TiTaHf 的 HEA 作为植入材料的潜力的早期迹象。