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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Microstructure evolution and mechanical properties of atmosphere plasma sprayed AlCoCrFeNi high-entropy alloy coatings under post-annealing
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Microstructure evolution and mechanical properties of atmosphere plasma sprayed AlCoCrFeNi high-entropy alloy coatings under post-annealing

机译：黄色等离子喷涂AlcoCrfeni高熵合金涂层的微观结构演化与机械性能

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摘要

In this work, atmosphere plasma spraying (APS) was employed to fabricate thick AlCoCrFeNi high entropy alloy (HEA) coatings from commercial HEA powders. Effects of annealing treatments on the phase transformation, microstructure and mechanical properties of HEA coating were systematically investigated. Results showed that the as-sprayed HEA coating exhibited typical lamellar microstructures with some oxidation strips. The as-sprayed coating was composed of two BCC phases-Fe-Cr rich (A2) and Al-Ni rich phase (B2). The transformation from BCC to FCC structure (A1) occurred during post-annealing, which became more apparent with increasing temperature in the range of 600 & ndash;900 degrees C. The rod-shape A2 phase was embedded in the B2 matrix and merged to grow larger with increasing temperature. EPMA analysis revealed that the diffusion of Al and Cr made A2 phase of (Fe, Cr) separate from B2 phase of (Al, Ni), accompanying with the formation of A1 phase (Fe, Ni). Microhardness and nano-indentation test showed that the hardness and elastic modulus of as-annealed coatings reached the peak value at 600 degrees C (576 HV) and 700 degrees C (232.4 GPa), respectively, then decreased with further increasing temperature (800 & ndash;1000 degrees C). The mechanical performance showed close relationship with the volume fraction change of A2 and B2 phase.
机译：在这项工作中，大气等离子喷涂（APS）用于从商用HEA粉末制备厚AlCoCrFeNi高熵合金（HEA）涂层。系统研究了退火处理对HEA涂层相变、组织和力学性能的影响。结果表明，喷涂态HEA涂层呈现出典型的层状组织，并伴有一些氧化带。喷涂态涂层由两个BCC相组成：富Fe-Cr（A2）和富Al-Ni相（B2）。BCC向FCC结构（A1）的转变发生在后退火过程中，在600&ndash范围内随着温度的升高而变得更加明显；900摄氏度。棒状A2相嵌入B2基体中，并随着温度的升高合并成更大。EPMA分析表明，铝和铬的扩散使（Fe，Cr）的A2相与（Al，Ni）的B2相分离，并伴随着A1相（Fe，Ni）的形成。显微硬度和纳米压痕试验表明，退火涂层的硬度和弹性模量分别在600摄氏度（576 HV）和700摄氏度（232.4 GPa）时达到峰值，然后随着温度的进一步升高（800&ndash；1000摄氏度）而降低。力学性能与A2和B2相的体积分数变化密切相关。

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