Fracture Toughness Investigations of an Ion‐Irradiated Nanocrystalline TiZrNbHfTa Refractory High‐Entropy Alloy

Author:

Moschetti Michael1ORCID,Hohenwarter Anton2ORCID,Alfreider Markus2ORCID,Couzinié Jean‐Philippe3ORCID,Wei Tao4ORCID,Davis Joel4ORCID,Xu Alan45ORCID,Bhattacharyya Dhriti45ORCID,Kruzic Jamie Joseph1ORCID,Gludovatz Bernd1ORCID

Affiliation:

1. School of Mechanical and Manufacturing Engineering University of New South Wales (UNSW Sydney) Sydney NSW 2052 Australia

2. Department of Materials Science Montanuniversität Leoben Jahnstrasse 12 8700 Leoben Austria

3. Univ Paris Est Creteil CNRS, ICMPE, UMR 7182 2 Rue Henri Dunant Thiais 94320 France

4. Australian Nuclear Science and Technology Organisation Lucas Heights NSW 2234 Australia

5. School of Materials Science and Engineering University of New South Wales (UNSW Sydney) Sydney NSW 2052 Australia

Abstract

Refractory high‐entropy alloys (RHEAs) show potential for use in extreme environments, such as advanced nuclear reactors, owing to their high melting temperature, and often outstanding combinations of mechanical properties, corrosion resistance, and irradiation‐damage tolerance. This study evaluates the fracture toughness of a TiZrNbHfTa RHEA across different scales and microstructures, with a focus on the impact of He2+‐ion irradiation. Micro‐ and millimeter‐scale specimens with nanocrystalline (NC) microstructures are compared to existing ASTM standard sized coarse‐grained (CG) specimen data, with critical dimensions spanning over three orders of magnitude, from 10 μm to 12 mm. The ASTM standard sized CG specimens exhibit a fracture toughness 41‐fold greater than their NC microscale counterparts (210–5.1 MPa m1/2), while NC millimeter‐scale specimens show a 7.5‐fold higher fracture toughness than NC microscale specimens (38.1–5.1 MPa m1/2). He2+‐ion irradiation leads to a 27% decrease in fracture toughness in the NC microscale specimens. The results highlight the impact of sample dimensional scale, microstructure, and ion irradiation on the fracture toughness of the RHEA, indicating a need for thorough examination of such factors when investigating the mechanical properties of these materials.

Funder

Australian Research Council

Publisher

Wiley

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