Hyperadaptor; Temperature-insensitive tensile properties of Ni-based high-entropy alloy a wide temperature range

Abstract

This study introduces the concept of ‘Hyperadaptor’ alloys, materials engineered to maintain consistent performance across a wide range of environmental conditions. We present a Ni-based high-entropy alloy (HEA) that exhibits minimal sensitivity to temperature variations from 77 K to 873 K, maintaining both strength and ductility due to nano-sized L12 precipitates, coarse grain, and high stacking fault energy. The temperature-independent mechanism of dislocation slip-induced plasticity further supports its stability. Our findings highlight the potential of Ni-based HEA for demanding applications in aerospace, automotive, and energy sectors, establishing them as pioneering materials in alloy development.HIGHLIGHTS Introduces the concept of ‘Hyperadaptor’ materials, which exhibits minimal environmental sensitivity, and demonstrates Ni-based high-entropy alloys (HEAs) as prime examples, showing consistent mechanical properties across a wide temperature range from 77 K to 873 K.Demonstrates minimal temperature sensitivity of Ni-based HEA through analyses of nano-sized L12 precipitates and high stacking fault energy, enhancing strength and ductility.Employs various characterization techniques, including EBSD, ECCI, and TEM, to illustrate the dislocation slip-induced plasticity and precipitation hardening, achieving temperature-independent mechanical performance.Validates the potential of Ni-based HEAs for critical applications in the aerospace, automotive, and energy sectors, emphasizing their consistent mechanical properties under extreme temperature fluctuations.