The microstructure and He+ ion irradiation behavior of novel low-activation W-Ta-Cr-V refractory high entropy alloy for nuclear applications

被引：12

作者：

Kalita, D. ^{[1
]}

Jozwik, I. ^{[1
]}

Kurpaska, L. ^{[1
]}

Zhang, Y. ^{[2
,3
]}

Mulewska, K. ^{[1
]}

Chrominski, W. ^{[1
,4
]}

O'Connell, J. ^{[5
]}

Ge, Y. ^{[6
]}

Boldman, W. L. ^{[3
]}

Rack, P. D. ^{[3
]}

Wang, Y. ^{[7
]}

Weber, W. J. ^{[3
]}

Jagielski, J. ^{[8
,9
]}

机构：

[1] Natl Ctr Nucl Res, Nomaten Ctr Excellence, A Soltana 7 St, PL-05400 Otwock, Poland

[2] Idaho Natl Lab, Condensed Matter Phys Energy & Environm Sci & Tech, Idaho Falls, ID 83415 USA

[3] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA

[4] Warsaw Univ Technol, Fac Mat Sci & Engn, Woloska 141 St, PL-02507 Warsaw, Poland

[5] Nelson Mandela Univ, Ctr HRTEM, ZA-6031 Port Elizabeth, South Africa

[6] VTT Tech Res Ctr Finland Ltd, Jyvaskyla, Finland

[7] Los Alamos Natl Lab, Mat Sci & Technol Div, Los Alamos, NM USA

[8] Natl Ctr Nucl Res, A Soltana 7 St, PL-05400 Otwock, Poland

[9] Lukasiewicz Res Network, Inst Microelect & Photon, Al Lotnikow 32-46, Warsaw, Poland

来源：

NUCLEAR MATERIALS AND ENERGY | 2023年 / 37卷

基金：

新加坡国家研究基金会;

关键词：

High-entropy alloys; HEA; Ion irradiation; He bubbles; Radiation damage; He irradiation; IN-SITU TEM; MECHANICAL-PROPERTIES; ION IRRADIATION; LOW-ENERGY; BUBBLE FORMATION; THIN-FILMS; TUNGSTEN; HELIUM; NANOINDENTATION; DEPENDENCE;

D O I：

10.1016/j.nme.2023.101513

中图分类号：

TL [原子能技术]; O571 [原子核物理学];

学科分类号：

0827 ; 082701 ;

摘要：

Microstructure and nanohardness of a nearly equimolar W-Ta-Cr-V high entropy alloy (HEA), as well as its irradiation response under He+ irradiation, were investigated. The single-phase body-centered cubic nano- structured alloy with a 1 mu m thick layer was fabricated on a silicon substrate using a magnetron sputtering method. The HEA film has a complex microstructure consisting of micrometric domains that exhibit internal nanostructure controlled by their crystal orientation. The measured nanohardness of the W-Ta-Cr-V alloy is 13 +/- 2 GPa, which significantly exceeds the hardness of nanocrystalline tungsten as a result of the high solid-solution strengthening effect. In order to evaluate the irradiation resistance of the HEA film, the material was irradiated with 200 keV He+ ions at room temperature, with two different ion fluences: 1 x1016 and 5 x1016 ions/cm2. Using transmission electron microscopy, a high density of extremely fine He bubbles is observed that were uniformly distributed in the matrix. The increase of He+ ion fluence increased the density of bubbles, whereas their size remained at a similar level, which indicates that the damage proceeds by the nucleation of additional He bubbles, not by their growth.

引用

页数：12