Microstructural characterization, mechanical property and corrosion behavior of VNbMoTaWAl refractory high entropy alloy coatings: Effect of Al content
Microstructural characterization, mechanical property and corrosion behavior of VNbMoTaWAl refractory high entropy alloy coatings: Effect of Al content
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DOI：
10.1016/j.surfcoat.2020.126351
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发表时间：
2020-12-15
影响因子：
5.4
通讯作者：
Lee, Jyh-Wei
中科院分区：
文献类型：
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作者：
Bachani, Sameer Kamrudin;Wang, Chaur-Jeng;Lee, Jyh-Wei
近年来，耐火高熵合金涂层因其高温强度和稳定的热性能而受到广泛关注。在这项研究中，使用脉冲直流磁控共溅射系统制备了VNbMoTaW和三种含Al的VNbMoTaWAl耐火高熵合金涂层。本研究选择在 VNbMoTaW 涂层中添加 Al，因为 Al 是一种以其轻质而闻名的重要材料。当添加 8.54 at.% Al 时，VNbMoTaWAl 涂层的 BCC 相保持不变。 VNbMoTaW和VNbMoTaWAl涂层的表面粗糙度、晶粒尺寸和密度随着Al含量的增加而降低。在VNbMoTaW涂层中添加Al元素，由于固溶硬化效应，其硬度可提高至18.1 GPa。耐火VNbMoTaW和VNbMoTaWAl涂层提高了304不锈钢基体在0.5 M H2SO4溶液中的耐腐蚀性。此外，添加 2.37 at.% Al 后，VNbMoTaWAl 涂层具有最佳的耐腐蚀性能。还提出了VNbMoTaWAl涂层在0.5 M H(2)SO(4)溶液中的等效电路。然而，VNbMoTaWAl 涂层中超过 3 at.% 的氧污染会由于氧化物相的形成而对涂层的机械性能和耐腐蚀性产生不利影响。
Recently, the refractory high entropy alloy coatings have drawn lots of attention due to their high temperature strength and stable thermal properties. In this study, the VNbMoTaW and three Al contained VNbMoTaWAl refractory high entropy alloy coatings were fabricated using a pulsed direct current magnetron co-sputtering system. Al addition into the VNbMoTaW coatings was chosen for this study since Al is an important material known for its lightweight. The BCC phase of the VNbMoTaWAl coating was kept as 8.54 at.% Al was added. The surface roughness, grain size and density of VNbMoTaW and VNbMoTaWAl coatings decreased with increasing Al content. The addition of Al element into VNbMoTaW coating can increase its hardness up to 18.1 GPa due to the solution hardening effect. The corrosion resistance of the 304 stainless steel substrate in 0.5 M H2SO4 solution was improved by the refractory VNbMoTaW and VNbMoTaWAl coatings. Furthermore, the best corrosion resistance of VNbMoTaWAl coatings was obtained by the addition of 2.37 at.% Al. The equivalent circuit of the VNbMoTaWAl coatings in 0.5 M H(2)SO(4 )solution was also proposed. However, the oxygen contamination in excess of 3 at.% in the VNbMoTaWAl coatings had detrimental effects on the mechanical properties and corrosion resistance of the coatings due to formation of oxide phases.