放电等离子体烧结的含钨难熔高熵合金

Yongchul Yoo; Xiang Zhang; Fei Wang; Xin Chen; Xing-Zhong Li; Michael Nastasi; Bai Cui

doi:10.1007/s12613-023-2711-9

Volume 31 Issue 1

Jan. 2024

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文章导航 > 矿物冶金与材料学报（英文） > 2024 > 31(1): 146-154

Yongchul Yoo, Xiang Zhang, Fei Wang, Xin Chen, Xing-Zhong Li, Michael Nastasi, and Bai Cui, Spark plasma sintering of tungsten-based WTaVCr refractory high entropy alloys for nuclear fusion applications, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 146-154. https://doi.org/10.1007/s12613-023-2711-9

Cite this article as:

Yongchul Yoo, Xiang Zhang, Fei Wang, Xin Chen, Xing-Zhong Li, Michael Nastasi, and Bai Cui, Spark plasma sintering of tungsten-based WTaVCr refractory high entropy alloys for nuclear fusion applications, Int. J. Miner. Metall. Mater., 31(2024), No. 1, pp. 146-154. https://doi.org/10.1007/s12613-023-2711-9

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研究论文

放电等离子体烧结的含钨难熔高熵合金

1)
Department of Mechanical & Materials Engineering, University of Nebraska–Lincoln, Lincoln, NE 68588, USA
2)
Nebraska Center for Materials and Nanoscience, University of Nebraska–Lincoln, Lincoln, NE 68588, USA
3)
Department of Nuclear Engineering, Texas A & M University, College Station, TX 77843, USA

通讯作者:
Bai Cui E-mail: bcui3@unl.edu

文章亮点

(1) 开发了机械合金化结合放电等离子体烧结的粉末冶金工艺来制备含钨难熔高熵合金。

(2) 揭示了高熵合金基体中钽钒氧化物的形成机理。

(3) 发现WTaVCr的硬度高于钨和其他含钨高熵合金而且能保持到1000摄氏度。

中文摘要

WTaVCr难熔高熵合金是聚变堆中面向等离子体部件的一种新型候选材料。本研究用一种机械合金化结合放电等离子体烧结的粉末冶金工艺来制备这种合金。通过X射线衍射，能量色散X射线谱和选区电子衍射分析，高熵合金样品包含体心立方结构的难熔高熵合金基体和钽钒氧化物颗粒两种相。热力学计算表明，钽和钒的高氧亲和力可以解释钽钒氧化物的形成。电子背散射衍射揭示高熵合金的平均晶粒尺寸为6.2 μm。WTaVCr在室温下的抗压强度为2997 MPa，微米和纳米硬度都显著高于钨和其他文献报道过的含钨高熵合金，其高洛氏硬度能够保持到1000°C。

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Research Article

Spark plasma sintering of tungsten-based WTaVCr refractory high entropy alloys for nuclear fusion applications

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Abstract

Abstract

W-based WTaVCr refractory high entropy alloys (RHEA) may be novel and promising candidate materials for plasma facing components in the first wall and diverter in fusion reactors. This alloy has been developed by a powder metallurgy process combining mechanical alloying and spark plasma sintering (SPS). The SPSed samples contained two phases, in which the matrix is RHEA with a body-centered cubic structure, while the oxide phase was most likely Ta₂VO₆ through a combined analysis of X-ray diffraction (XRD), energy-dispersive spectroscopy (EDS), and selected area electron diffraction (SAED). The higher oxygen affinity of Ta and V may explain the preferential formation of their oxide phases based on thermodynamic calculations. Electron backscatter diffraction (EBSD) revealed an average grain size of 6.2 μm. WTaVCr RHEA showed a peak compressive strength of 2997 MPa at room temperature and much higher micro- and nano-hardness than W and other W-based RHEAs in the literature. Their high Rockwell hardness can be retained to at least 1000°C.
- refractory high entropy alloy;
- plasma-facing material;
- fusion reactor;
- spark plasma sintering

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