Si对激光熔覆AlCrFeNiNbSix HEA涂层组织和腐蚀行为的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics Pub Date : 2025-06-16 DOI:10.1016/j.intermet.2025.108882

Xiujie Xia , Jing Liu , Yuanxu Duan , Zhepeng Song , Jian Zhang

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引用次数: 0

摘要

采用激光熔覆技术在304SS衬底上制备了AlCrFeNiNbSix (x = 0,0.4, 0.8) HEA涂层。研究了Si对涂层组织和腐蚀性能的影响。结果表明，所设计的涂层均具有典型的枝晶和枝晶间组织。Si的加入使晶粒细化，平均晶粒尺寸由8.36 μm （Si0）减小到5.02 μm （Si0.4）。相分析表明，Si0涂层由BCC相、FCC相和Laves相组成，而含si的AlCrFeNiNbSix涂层形成Fe4Nb4Si相，Laves相明显减少。电化学测试结果表明，AlCrFeNiNbSix涂层的耐蚀性均优于304SS涂层。适量的Si可以平衡合金的组织均匀性和钝化行为。其中Si0.4涂层的耐蚀性能最好。Si元素的掺入有利于SiO2、Cr2O3等稳定氧化物的形成，两者协同形成致密的复合钝化膜，有效抑制腐蚀离子的渗透。

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Effect of Si on the microstructure and corrosion behavior of AlCrFeNiNbSix HEA coating fabricated by laser cladding

AlCrFeNiNbSi_x (x = 0, 0.4, 0.8) HEA coatings were fabricated on 304SS substrate using laser cladding technology. The influence of Si on the microstructure and corrosion behavior of the coatings was investigated. The findings revealed that all the designed coatings exhibited typical dendritic and interdendritic microstructure. The introduction of Si led to grain refinement, with the average grain size decreasing from 8.36 μm (Si0) to 5.02 μm (Si0.4). Phase analysis indicated that the Si0 coating consisted of BCC, FCC, and Laves phase, while the Si-containing AlCrFeNiNbSi_x coatings developed Fe₄Nb₄Si phase accompanied by a marked reduction in Laves phase. The electrochemical test results indicated that the corrosion resistance of all the AlCrFeNiNbSi_x coatings surpassed that of 304SS. Appropriate amount of Si can balance the microstructure uniformity and passivation behavior of the alloy. Among them, the Si0.4 coating showed the best corrosion resistance. The incorporation of Si element can facilitate the formation of the stable oxides, such as SiO₂ and Cr₂O₃, which can synergistically construct a dense composite passivation film that effectively inhibited the penetration of the corrosive ions.

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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.