中文版 | English
Title

Preliminary exploration of a WTaVTiCr high-entropy alloy as a plasma-facing material

Author
Corresponding AuthorZhu, Qiang
Publication Years
2022-12-01
DOI
Source Title
ISSN
0029-5515
EISSN
1741-4326
Volume62Issue:12
Abstract

With great power comes great challenges. For nuclear fusion, the holy grail of energy, taming the flame of a miniature star in a solid container remains one of the most fundamental challenges. A tungsten armour for the solid container marks a temporary triumph-a solution adopted by the world's largest fusion experiment, ITER-but may be insufficient for future challenges. High-entropy alloys (HEAs), which are characteristic of a massive compositional space, may bring new solutions. Here, we explore their potential as plasma-facing materials (PFMs) with a prototype W57Ta21V11Ti8Cr3 HEA that was designed by exploiting the natural-mixing tendency among low-activation refractory elements. Revealed by x-ray diffraction analysis and energy-dispersive x-ray spectroscopy, it predominantly consists of a single bcc-phase but with V, Ti, and Cr segregation to grain boundaries and at precipitates. Its yield strength improves similar to 60% at room temperature and oxidation rate reduces similar to 6 times at 1273 K, compared with conventionally used W. The Ti-V-Cr rich segregations and the formed CrTaO4 compound contribute to the improved oxidation resistance. However, the Ti-V-Cr rich segregations, along with the decreasing valence-electron concentration of the matrix by the addition of Ta, V and Ti elements, considerably increase the deuterium retention of the W57Ta21V11Ti8Cr3 HEA to similar to 675 multiples of recrystallized W. Moreover, its thermal conductivity decreases, being similar to 40% of W at 973 K. However, the maximum tolerable steady-state heat load is still similar to 84% of W because of its exceedingly high yield strength at elevated temperatures. Overall, despite being preliminary, we expect HEAs to play an important role in the development of advanced PFMs, for their disadvantages are likely to be compensated by their advantages or be overcome by composition optimization.

Keywords
URL[Source Record]
Indexed By
Language
English
SUSTech Authorship
First ; Corresponding
Funding Project
China Postdoctoral Science Foundation[2022M711468] ; Shenzhen Science and Technology Innovation Commission[
WOS Research Area
Physics
WOS Subject
Physics, Fluids & Plasmas
WOS Accession No
WOS:000859467400001
Publisher
ESI Research Field
PHYSICS
Data Source
Web of Science
Citation statistics
Cited Times [WOS]:0
Document TypeJournal Article
Identifierhttp://kc.sustech.edu.cn/handle/2SGJ60CL/406046
DepartmentDepartment of Mechanical and Energy Engineering
理学院_物理系
Affiliation
1.Southern Univ Sci & Technol, Dept Mech & Energy Engn, Shenzhen 518055, Peoples R China
2.Shenzhen Key Lab Addit Mfg High Performance Mat, Shenzhen 518055, Peoples R China
3.Beihang Univ, Sch Phys, Beijing 100191, Peoples R China
4.Southern Univ Sci & Technol, Dept Phys, Shenzhen 518055, Peoples R China
5.Chinese Acad Sci, HFIPS, Inst Plasma Phys, Hefei 230031, Peoples R China
6.Univ Sci & Technol China, Hefei 230026, Peoples R China
First Author AffilicationDepartment of Mechanical and Energy Engineering
Corresponding Author AffilicationDepartment of Mechanical and Energy Engineering
First Author's First AffilicationDepartment of Mechanical and Energy Engineering
Recommended Citation
GB/T 7714
Li, Yu,Sun, Yuhan,Cheng, Long,et al. Preliminary exploration of a WTaVTiCr high-entropy alloy as a plasma-facing material[J]. Nuclear Fusion,2022,62(12).
APA
Li, Yu.,Sun, Yuhan.,Cheng, Long.,Yuan, Yue.,Jia, Baohai.,...&Zhu, Qiang.(2022).Preliminary exploration of a WTaVTiCr high-entropy alloy as a plasma-facing material.Nuclear Fusion,62(12).
MLA
Li, Yu,et al."Preliminary exploration of a WTaVTiCr high-entropy alloy as a plasma-facing material".Nuclear Fusion 62.12(2022).
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