Irradiation Resistance Properties of Wtavcr Alloy Coatings

Abstract

WTaVCr alloy coatings with different elemental contents and W substrates were selected for He ion irradiation experiments (irradiation energy 50 eV, irradiation dose of 1×1025 m-2, irradiation temperature 1273 K). After irradiation, the tungsten substrate showed a "fuzz" structure on the surface, while pinholes and convoluted structures appeared on the surface of WTaVCr. The irradiated WTaVCr alloy coatings exhibited a hardening phenomenon, The W25Ta23.5V20.8Cr30.6 alloy coating exhibits the lowest hardening rate, and the TEM observations of W25Ta23.5V20.8Cr30.6 show that the number density of He bubbles in the alloy was significantly lower than that of pure tungsten, which exhibits excellent resistance to irradiation.

Keywords: WTaVCr alloy coatings, He ion irradiation, lowest hardening rate, He bubbles