A novel bulk eutectic high-entropy alloy with outstanding as-cast specific yield strengths at elevated temperatures

Due to their excellent properties and great potential for industrial application, eutectic high-entropy alloys (EHEAs) have been a hot topic of study over the past few years. The current study reports a novel AlCr1.3TiNi2 EHEA with a low density and outstanding mechanical properties at elevated temperatures. A kilogram-scale EHEA ingot with uniform and ultrafine L2(1) and BCC lamellar structures (interlamellar spacing similar to 400 nm) was firstly prepared by a direct solidification method. The as-cast AlCr1.3TiNi2 EHEA exhibits much higher room- and high-temperature hardness and specific yield strength values than most reported refractory high-entropy alloys (RHEAS), EHEAs, and conventional Ni- and Ti-based alloys. (C) 2021 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.