Investigation on the Microstructure and Micro-Mechanical Properties of Thermal-Sprayed NiCoCrAlY High Entropy Alloy Coating

Designs Pub Date : 2024-04-20 DOI:10.3390/designs8020037

A. Basak, N. Radhika, C. Prakash, A. Pramanik

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Abstract

NiCoCrAlY high entropy alloy (HEA) coating (47.1 wt.% Ni, 23 wt.% Co, 17 wt.% Cr, 12.5 wt.% Al, and 0.4 wt.% Y) was deposited on a stainless steel subtract by atmospheric plasma spraying (APS). The as-deposited coating was about 300 μm thickness with <1% porosity. The microstructure of the coating consisted of dispersed secondary phases/intermetallics in the solid solution. The stress–strain behaviour of this coating was investigated in micro-scale with the help of in situ micro-pillar compression. The experimental results show that yield and compressive stress in the cross-section of the coating was higher (1.27 ± 0.10 MPa and 2.19 ± 0.10 GPa, respectively) than that of the planar direction (0.85 ± 0.09 MPa and 1.20 ± 0.08 GPa, respectively). The various secondary/intermetallic phases (γ′–Ni3Al, β–NiAl) that were present in the coating microstructure hinder the lattice movement during compression, according to Orowan mechanism. In addition to that, the direction of the loading to that of the orientation of the phase/splat boundaries dictate the crack propagation architecture, which results in difference in the micro-mechanical properties.

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热喷涂镍钴铬铝高熵合金镀层的微观结构和微观力学性能研究

采用大气等离子喷涂（APS）技术在不锈钢底板上沉积了镍钴铬镍高熵合金（HEA）涂层（镍含量为 47.1 wt.%，钴含量为 23 wt.%，铬含量为 17 wt.%，铝含量为 12.5 wt.%，镍含量为 0.4 wt.%）。沉积后的涂层厚度约为 300 μm，孔隙率小于 1%。涂层的微观结构由固溶体中分散的次生相/金属间化合物组成。在原位微柱压缩的帮助下，在微尺度上研究了这种涂层的应力应变行为。实验结果表明，涂层横截面上的屈服应力和压缩应力（分别为 1.27 ± 0.10 MPa 和 2.19 ± 0.10 GPa）高于平面方向上的屈服应力和压缩应力（分别为 0.85 ± 0.09 MPa 和 1.20 ± 0.08 GPa）。根据奥罗恩机制，涂层微观结构中存在的各种次生/金属间相（γ′-Ni3Al、β-NiAl）阻碍了压缩过程中的晶格运动。此外，加载方向与相/板层边界的取向决定了裂纹的扩展结构，从而导致微观力学性能的差异。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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