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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 >Phase structures of gas atomized equiatomic CrFeNiMn high entropy alloy powder
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Phase structures of gas atomized equiatomic CrFeNiMn high entropy alloy powder

机译：气体雾化赤素CRFENIMN高熵合金粉的相结构

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摘要

In powder technologies such as sintering, 3-D printing, and thermal spraying, the characteristics of the powders are of uttermost importance. This holds for composition as well as for phase and grain structure. In this work, we characterize argon gas atomized Cr25.2Fe24.8Ni25.5Mn24.5 high entropy alloy powder, which is a material of high interest for applications requiring high strength and radiation resistance. The microstructure of gas atomized particles at different class sizes is characterized and the powder properties are determined by nanoindentation and magnetic measurements. The atomized particles have a smooth spherical shape with a fine surface pattern. The composition and phase structure as well as hardness and magnetic properties are particle size dependent, i.e., depend on cooling rate during atomization. The phase structure of the atomized powder is nearly single FCC phase with a small amount of BCC phase, the amount of which increased with the decreasing powder particle size. Average nano-hardness determined from nanoindentation of particle class sizes <20 mu m and 90-150 mu m are 4.25 +/- 0.73 GPa and 3.96 +/- 0.60 GPa, respectively. The particles are paramagnetic at room temperature, but at 10 K an increasing ferromagnetic contribution is observed with decreasing powder particle size and increasing fraction of dispersed BCC phase. The Curie point of this soft magnetic phase is about 205 K. (C) 2020 Published by Elsevier B.V.
机译：在粉末技术，如烧结，3-D印刷和热喷涂，粉末的特性具有最重要的。这适用于组合物以及相和晶粒结构。在这项工作中，我们表征了氩气雾化CR25.2FE24.8NI25.5MN24.5高熵合合金粉末，这是需要高强度和辐射抗性的应用的高兴趣材料。在不同级别尺寸下的气体雾化颗粒的微观结构表征，并通过纳米狭窄和磁测量确定粉末性能。雾化颗粒具有光滑的球形，具有细表面图案。组合物和相结构以及硬度和磁性是粒度，即取决于雾化期间的冷却速率。雾化粉末的相结构几乎单独的FCC相，少量的BCC阶段，其量随着粉末粒径的降低而增加。从颗粒类别尺寸<20μm和90-150μm的纳米狭窄测定的平均纳米硬度分别为4.25±0.73GPa和3.96 +/- 0.60GPa。颗粒在室温下是顺磁性的，但在10 k下，通过降低粉末粒度和增加的分散的BCC阶段，观察到10K增加的铁磁贡献。这种软磁相的居里点约为205 k。（c）2020由elestvier b.v发布。

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