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激光熔覆AlCoCrFeNiSix高熵合金涂層的微觀組織及耐蝕性能
作者:
作者單位:

1.中國礦業(yè)大學(xué)機(jī)電工程學(xué)院;2.中國礦業(yè)大學(xué)江蘇省礦山智能采掘裝備協(xié)同創(chuàng)新中心

作者簡介:

通訊作者:

中圖分類號:

TG174;TN249

基金項(xiàng)目:

國家自然科學(xué)基金青年基金項(xiàng)目(51905534)、江蘇高校優(yōu)勢學(xué)科建設(shè)工程資助項(xiàng)目(PAPD)


Microstructure and Corrosion Resistance of AlCoCrFeNiSix High-entropy Alloy Coating by Laser Cladding
Author:
Affiliation:

1.China University of Mining and Technology,School of Mechanical and Electrical Engineering;2.China University of Mining and Technology, Jiangsu Collaborative Innovation Center of Intelligent Mining Equipment

Fund Project:

National Natural Science Foundation of China(Grant No. 51905534)、Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)

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    摘要:

    利用激光熔覆技術(shù)在AISI 304不銹鋼表面制備了AlCoCrFeNiSix（x=0.1，0.2，0.3，0.4，0.5）高熵合金涂層。采用X射線衍射儀（XRD）、掃描電子顯微鏡（SEM）、能譜分析儀（EDS）、透射電子顯微鏡（TEM）、維氏硬度計(jì)和電化學(xué)工作站等，分析了Si元素對AlCoCrFeNiSix高熵合金涂層微觀組織和性能的影響。結(jié)果表明：AlCoCrFeNiSix高熵合金涂層由體心立方（BCC）固溶體晶粒構(gòu)成。隨著Si元素含量的增加，Si元素置換固溶使晶格收縮，晶粒逐步細(xì)化，納米尺度球狀A(yù)lNi相在晶粒內(nèi)脫溶，少量的Cr23C6碳化物沿晶界析出。微觀組織的演化導(dǎo)致涂層的顯微硬度升高，最大硬度達(dá)到848.1 HV0.3。AlCoCrFeNiSix高熵合金涂層的熱力學(xué)腐蝕傾向和均勻腐蝕速率均低于基材AISI 304不銹鋼。Si元素的摻雜提高了鈍化膜的修復(fù)能力和穩(wěn)定性，使腐蝕機(jī)制從自催化發(fā)展的點(diǎn)蝕轉(zhuǎn)變?yōu)榫чg腐蝕。

    Abstract:

    AlCoCrFeNiSix(x=0.1，0.2，0.3，0.4，0.5) high-entropy alloy coatings were prepared on the surface of AISI 304 stainless steel. The effect of Si element on the microstructure and properties of the high-entropy alloy was investigated using X-ray diffractometer (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS), transmission electron microscope (TEM), Vickers hardness tester, and electrochemical workstation. The results show that the high-entropy alloy coatings consist of solid-solution grains with body-centered cubic (BCC) lattice. With the increase of the Si element content, the substitutional solid solution of Si element causes the crystal lattice to shrink, and the crystal grains are gradually refined. Besides, the AlNi phase with nano-scale spherical shape is dissolved in the crystal grains, and a small amount of Cr23C6 carbides are precipitated along the grain boundaries. The evolution of the microstructure leads to an increase in the microhardness of the coating, with the maximum hardness reaching 848.1 HV0.3. The thermodynamic corrosion tendency and uniform corrosion rate of AlCoCrFeNiSix high-entropy alloy coating are lower than the AISI 304 stainless steel. The doping of Si element improves the repair ability and stability of the passivation film, and promotes the corrosion mechanism to transform from pitting corrosion developed by autocatalysis to intergranular corrosion.

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引用本文

劉昊,高強(qiáng),郝敬賓,張國忠,胡元,楊海峰.激光熔覆AlCoCrFeNiSix高熵合金涂層的微觀組織及耐蝕性能[J].稀有金屬材料與工程,2022,51(6):2199~2208.[Liu Hao, Gao Qiang, Hao Jingbin, Zhang Guozhong, Hu Yuan, Yang Haifeng. Microstructure and Corrosion Resistance of AlCoCrFeNiSix High-entropy Alloy Coating by Laser Cladding[J]. Rare Metal Materials and Engineering,2022,51(6):2199~2208.]
DOI：10.12442/j. issn.1002-185X.20210484

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  • 收稿日期:2021-06-02
  • 最后修改日期:2021-07-27
  • 錄用日期:2021-08-06
  • 在線發(fā)布日期: 2022-07-06
  • 出版日期: 2022-06-29