Plasma and X-ray radiation-induced damage mechanisms in a tungsten heavy alloy

JOURNAL OF NUCLEAR MATERIALS

卷:539

Article

An, Qi^1,2  Elshafiey, Ahmed³  Huang, Lujun²  Hammer, David A.³  Hassani, Mostafa¹ 

[1] Cornell Univ, Sibley Sch Mech & Aerosp Engn, Ithaca, NY 14850 USA

[2] Harbin Inst Technol, Sch Mat Sci & Engn, Harbin 150001, Peoples R China

[3] Cornell Univ, Sch Elect & Comp Engn, Ithaca, NY 14850 USA

关键词: Tungsten heavy alloys;    Extreme conditions;    Plasma damage;    X-ray radiation;    X-pinch;   

DOI  :  10.1016/j.jnucmat.2020.152325

来源: Elsevier

【 摘 要 】

Tungsten-based materials are among the main candidate plasma-facing materials for future fusion reactors where extreme conditions of thermomechanical stresses, radiation, and energetic particles must be withstood. Here a hybrid X-pinch platform combined with a pulsed power machine was used to study damage mechanisms in 90W-4Cu-6Ni tungsten heavy alloy as a result of exposure to high energy density plasma, X-ray radiation, and the resulting thermal shock. It was found that the plasma-facing surface of the material undergoes severe melting and ablation with the extent of ablation being higher in the Cu-Ni phase than the W particles. Rapid melting and solidification transform the W particles into fine dendrite morphologies embedded in the Cu-Ni solid solution. Cracking was also observed in the subsurface layers at the interfaces between the W particles and the Cu-rich phase of the Cu-Ni matrix. X-ray radiation, on the other hand, cause slight melting on the surface without significant ablation and no cracking. (C) 2020 Elsevier B.V. All rights reserved.

【 授权许可】

Free