Microstructure and properties of typical equiatomic CrMnFeCoNi high entropy alloy doped with different rare earth elements

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2024-09-05 DOI:10.1016/j.intermet.2024.108477

Long Meng , Sheng Fang , Mingtian Tan , Wanying Fu , Lingsheng Ke

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引用次数: 0

Abstract

The addition of rare earth elements (REEs) can effectively modify the microstructure of alloy and improve the properties. The effects of doping REEs in equiatomic CrMnFeCoNi high entropy alloys were investigated. Doping with REEs led to the formation of a few new phases enriched in the interdendritic regions and reduced the grain size. Doping REEs significantly improved the hardness and wear resistance of the alloy, and the Sm-doped alloy showed the most notable enhancement with the hardness value, the average friction coefficient and wear rate of HV 347.9, 0.28 and 0.91 × 10⁻⁶ mm³ N⁻¹ m⁻¹, respectively. The mechanical properties of the alloy were improved by the second phase strengthening and grain refinement and the wear mechanism was typical abrasive wear. However, the electrochemical properties indicated that doping with REEs weakened the corrosion resistance of the alloys; Pr- and La-doped alloys altered the corrosion behaviors on the alloy surfaces. The self-corrosion current density and potential of CrMnFeCoNiSm_0.2 alloy were 2.94 × 10⁻⁶ A cm⁻² and -0.46 V, respectively. This research plays a guiding role to study in REEs doping in HEA, meanwhile is of great significance in promoting the industrial application of HEA.

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掺杂不同稀土元素的典型等原子铬锰铁钴镍高熵合金的显微结构和性能

添加稀土元素（REEs）可有效改变合金的微观结构并改善其性能。研究了在等原子铬锰铁钴镍高熵合金中掺杂稀土元素的影响。掺杂 REEs 后，在树枝间区域形成了一些富集的新相，并减小了晶粒尺寸。掺杂 REEs 能明显提高合金的硬度和耐磨性，其中掺杂 Sm 的合金的硬度值、平均摩擦系数和磨损率分别达到 HV 347.9、0.28 和 0.91 × 10-6 mm3 N-1 m-1 ，提高最为明显。合金的机械性能通过第二相强化和晶粒细化得到改善，磨损机理为典型的磨料磨损。然而，电化学性能表明，掺杂 REEs 削弱了合金的耐腐蚀性；掺杂 Pr- 和 La 的合金改变了合金表面的腐蚀行为。CrMnFeCoNiSm0.2合金的自腐蚀电流密度和电位分别为2.94 × 10-6 A cm-2和-0.46 V。该研究对在 HEA 中掺杂稀土元素的研究具有指导作用，同时对促进 HEA 的工业应用具有重要意义。

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来源期刊

Intermetallics 工程技术-材料科学：综合

CiteScore

7.80

自引率

9.10%

发文量

291

审稿时长

37 days

期刊介绍： This journal is a platform for publishing innovative research and overviews for advancing our understanding of the structure, property, and functionality of complex metallic alloys, including intermetallics, metallic glasses, and high entropy alloys. The journal reports the science and engineering of metallic materials in the following aspects: Theories and experiments which address the relationship between property and structure in all length scales. Physical modeling and numerical simulations which provide a comprehensive understanding of experimental observations. Stimulated methodologies to characterize the structure and chemistry of materials that correlate the properties. Technological applications resulting from the understanding of property-structure relationship in materials. Novel and cutting-edge results warranting rapid communication. The journal also publishes special issues on selected topics and overviews by invitation only.