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首页> 美国卫生研究院文献>Materials >Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance
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Microstructural Evolution of AlCoCrFeNiSi High-Entropy Alloy Powder during Mechanical Alloying and Its Coating Performance

机译：机械合金化过程中AlCoCrFeNiSi高熵合金粉末的组织演变及其涂层性能

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摘要

High-entropy alloys (HEAs) are promising structural materials due to their excellent comprehensive performances. The use of mechanically alloyed powders to deposit HEA coatings through atmospheric plasma spraying (APS) is an effective approach that can broaden the application areas of the HEAs. In this paper, a ductility–brittleness AlCoCrFeNiSi system was chosen as an object of study, and the detailed evolution of the surface morphology, particle size distribution, and microstructure of the powder during mechanical alloying was investigated. An AlCoCrFeNiSi HEA coating was deposited using powder milled for 10 h, which can be used as an ideal feedstock for APS. The surface morphology, microstructure, microhardness, and wear behavior of the coating at room temperature were investigated. The results showed that as the milling time increased, the particle size first increased, and then decreased. At the milling time of 10 h, simple body-centered cubic (BCC) and face-centered cubic (FCC) solid solution phases were formed. After spraying, the lamellar structure inside a single particle disappeared. An ordered BCC phase was detected, and the diffraction peaks of the Si element also disappeared, which indicates that phase transformation occurred during plasma spraying. A transmission electron microscopy analysis showed that nanometer crystalline grains with a grain size of about 30 nm existed in the APS coating. For the coating, an average microhardness of 612 ± 41 HV was obtained. Adhesive wear, tribo-oxidation wear, and slight abrasion wear took place during the wear test. The coating showed good wear resistance, with a volume wear rate of 0.38 ± 0.08 × 10−4 mm3·N−1·m−1, which makes it a promising coating for use in abrasive environments.
机译：高熵合金（HEA）由于其出色的综合性能而成为有前途的结构材料。使用机械合金化粉末通过大气等离子喷涂（APS）沉积HEA涂层是一种有效的方法，可以扩大HEA的应用领域。本文以延性-脆性AlCoCrFeNiSi体系为研究对象，研究了机械合金化过程中粉末的表面形貌，粒度分布和微观结构的详细演变。使用研磨10小时的粉末沉积AlCoCrFeNiSi HEA涂层，该粉末可用作APS的理想原料。研究了室温下涂层的表面形貌，显微组织，显微硬度和磨损行为。结果表明，随着研磨时间的增加，粒径先增大，然后减小。在10小时的研磨时间，形成了简单的体心立方（BCC）和面心立方（FCC）固溶相。喷涂后，单个颗粒内部的层状结构消失了。检测到有序的BCC相，并且Si元素的衍射峰也消失了，这表明在等离子喷涂过程中发生了相变。透射电子显微镜分析表明，在APS涂层中存在具有约30nm的晶粒尺寸的纳米晶粒。对于涂层，获得的平均显微硬度为612±41 HV。在磨损测试中发生了粘着磨损，摩擦氧化磨损和轻微磨损。涂层显示出良好的耐磨性，体积磨损率为0.38±0.08×10 −4 mm 3 ·N -1 ·m < sup> -1 ，这使其成为用于磨蚀性环境的有前途的涂料。

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