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摘要: 借助电极感应熔化气雾化法,制备了 FeCoNiCrMn高熵合金粉末;通过真空烧结技术,在钢表面制备了具有不同孔隙率和孔径的多孔高熵合金涂层. 研究了不同烧结工艺参数对多孔涂层孔隙率、孔径以及过渡层厚度的影响. 开展了Al-12Si合金在多孔高熵涂层钢表面的原位润湿铺展试验,探讨了多孔高熵合金涂层对表观接触角和铺展行为的影响规律,深入分析了多孔高熵结构内反应产物的显微组织和相组成. 结果表明,随着烧结温度的升高和保温时间的延长,多孔高熵合金涂层的过渡层厚度逐渐升高,孔隙率及平均孔径逐渐减少. 液态Al-12Si合金液滴在多孔涂层中微通道增强的毛细力作用下,迅速浸润到多孔结构中,并实现了材料表面的完全润湿. 在高熵合金的迟滞扩散效应与高熵效应共同作用下, 界面反应层中金属间化合物的形成受到显著阻碍,界面相结构由富Cr的FCC、富AlFe的BCC以及富AlNi的B2 + 富Al的BCC共晶状结构组成.
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表 1 不同烧结工艺参数下的多孔涂层EDS点分析(原子分数,%)
Table 1 Analysis of EDS points of porous coatings for different sintering process parameters
温度T/℃ 时间t/h Fe Co Cr Ni Mn 1 000 3 20.68 20.05 20.49 19.65 18.41 1 100 3 27.75 26.67 23.39 22.39 _ 1 200 3 28.78 25.67 21.61 23.94 _ 1 200 2 28.08 26.37 22.10 23.45 _ 1 200 1 27.73 26.72 23.41 22.14 _ 表 2 不同烧结工艺参数下界面过渡层厚度
Table 2 Interfacial transition layer thickness for different sintering process parameters
温度T/℃ 时间t/h 过渡层厚度d/μm 1 000 3 1.9 1 100 3 5.4 1 200 3 7.6 1 200 2 7.4 1 200 1 6.3 表 3 图12中I-IV区的EDS点分析(原子分数,%)
Table 3 EDS analysis at the points of the I-IV region in Fig12
位置 Al Si Fe Cr Co Ni 可能相 I 1.88 2.04 33.76 50.91 6.45 4.46 富Cr-FCC II 31.26 4.61 29.57 6.45 13.83 14.29 富AlFe-BCC III 60.57 2.98 9.27 8.73 9.52 8.73 富Al-BCC IV 26.72 2.32 14.67 2.82 15.28 38.24 富AlNi- B2 -
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