Boronizing of CoCrFeMnNi High-Entropy Alloys Using Spark Plasma Sintering
Boronizing of CoCrFeMnNi High-Entropy Alloys Using Spark Plasma Sintering
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DOI：
10.3390/jmmp6020029
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发表时间：
2022-02
影响因子：
3.2
通讯作者：
Hiroaki Nakajo;A. Nishimoto
中科院分区：
文献类型：
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作者：
Hiroaki Nakajo;A. Nishimoto
在本研究中，我们研究了面心立方高熵合金（HEA）保护涂层的形成。涂层采用扩散涂层法形成。在传统的扩散涂层方法中，由于长时间的高温处理，基材的力学性能下降是一个主要问题。因此，我们使用火花等离子烧结（SPS）形成陶瓷层，通过快速加热抑制晶粒生长，实现快速，低温加工。本研究的目的是利用SPS方法在CoCrFeMnNi HEAs表面形成硼化物，并研究其性质。以铸造法制备的CoCrFeMnNi HEA为基材，B4C和KBF4的粉末状混合物为硼源。对经过sps处理的样品表面进行分析，发现HEA表面形成了M2B、MB和mn3b4型硼化物。由于在HEA表面形成陶瓷层，表面硬度为2000 ~ 2500 HV，元素分析表明某些元素表现出特有的扩散行为。
In this study, we investigated the formation of a protective coating on a face-centered cubic high-entropy alloy (HEA). The coating was formed by a diffusion coating method. In the conventional diffusion coating method, the degradation of the mechanical properties of the base material owing to prolonged high-temperature treatment is a major issue. Therefore, we formed a ceramic layer using spark plasma sintering (SPS), which suppresses grain growth with rapid heating and enables fast, low-temperature processing. The objective of this study was to form borides on the surface of CoCrFeMnNi HEAs using the SPS method and to investigate their properties. A CoCrFeMnNi HEA prepared by the casting method was used as the base material, and a powdered mixture of B4C and KBF4 was used as the boron source. The analysis of the surfaces of the SPS-treated samples revealed the formation of M2B, MB, and Mn3B4-type borides on the HEA surface. The surface hardness was 2000–2500 HV owing to the formation of a ceramic layer on the HEA surface, and elemental analysis showed that certain elements exhibited characteristic diffusion behaviors.