Small-Scale Plastic Deformation of Nanocrystalline High Entropy Alloy

Sanghita Mridha; Mageshwari Komarasamy; Sanjit Bhowmick; Rajiv S Mishra; Sundeep Mukherjee

doi:10.3390/e20110889

Small-Scale Plastic Deformation of Nanocrystalline High Entropy Alloy

Entropy (Basel). 2018 Nov 20;20(11):889. doi: 10.3390/e20110889.

Authors

Sanghita Mridha¹, Mageshwari Komarasamy¹, Sanjit Bhowmick², Rajiv S Mishra¹, Sundeep Mukherjee¹

Affiliations

¹ Department of Materials Science and Engineering, University of North Texas, Denton, TX 76203, USA.
² Bruker Nano Surfaces, Minneapolis, MN 55344, USA.

Abstract

High entropy alloys (HEAs) have attracted widespread interest due to their unique properties at many different length-scales. Here, we report the fabrication of nanocrystalline (NC) Al_0.1CoCrFeNi high entropy alloy and subsequent small-scale plastic deformation behavior via nano-pillar compression tests. Exceptional strength was realized for the NC HEA compared to pure Ni of similar grain sizes. Grain boundary mediated deformation mechanisms led to high strain rate sensitivity of flow stress in the nanocrystalline HEA.

Keywords: deformation and fracture; high entropy alloy; nanocrystalline materials; sputtering; strain rate sensitivity.