機(jī)械合金化法制備AlCoNiFeCr高熵合金涂層

機(jī)械合金化法制備AlCoNiFeCr高熵合金涂層Preparation of AlCoNiFeCr high entropy alloy coating by mechanical alloying

利用機(jī)械合金化原理，在304不銹鋼板表面制得AlCoNiFeCr高熵合金涂層。采用XRD、SEM、EDS、顯微硬度測試和電化學(xué)腐蝕等技術(shù)分析涂層的組織結(jié)構(gòu)、顯微形貌、力學(xué)性能和耐腐蝕性能，并初步探討合金層的形成機(jī)理。結(jié)果表明：隨著球磨時(shí)間的增加，涂層厚度先增大后減小；當(dāng)球磨時(shí)間為9 h時(shí)涂層最厚，平均厚度約為110 μm；當(dāng)球磨時(shí)間為12 h時(shí)，涂層部分剝落。涂層的硬度明顯高于基體的，且從表面到基體硬度呈梯度下降，硬度最高值達(dá)590HV0.1約為基體硬度的3倍。電化學(xué)腐蝕試驗(yàn)表明，涂層有效增加了基體的耐腐蝕性能。

AlCoNiFeCr high entropy alloy coating was prepared successfully on the surface of 304 stainless by mechanical alloying. The microstructure, mechanical properties and corrosion resistance of the coating were analyzed by XRD, SEM, EDS, microhardness test and electrochemical etching. The formation mechanism of the alloy layer was also discussed. The results show that with milling time increasing, the thickness of the coating increases at first and then decreases. The coating prepared by milling for 9 h is the densest with average thickness of 110 μm. When the milling time is prolonged to 12 h, part of the coating is peeled off. The micro-hardness of coating is significantly higher than that of the substrate, and declines gradually from the top surface to inner substrate. The maximum micro-hardness of the coating is up to 590HV0.1, about three times that of the substrate. Electrochemical corrosion tests show that the coating effectively increases the corrosion resistance of the matrix.

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