Publication

High strength and plasticity of AlxCoCrFeNi/Al2O3 high-entropy alloy asymmetric nanolaminates

Johann Michler
2026

Abstract

High-entropy alloys (HEAs) have demonstrated exceptional strengths, while nanolaminate architectures offer precise control over grain size in thin films. In this work, magnetron-sputtered AlxCoCrFeNi HEA is combined with ultrathin atomic layer deposition amorphous Al2O3 to create crystalline-amorphous nanolaminates, improving both strength and plasticity in micromechanical testing. At 5.2 GPa, the best-performing nanolaminate achieves one of the highest strengths of any comparable system, while transmission electron microscopy shows that the amorphous interlayers accommodate up to 100 % biaxial strain without fracture. These results demonstrate how crystalline-amorphous nanolaminate architectures can improve the mechanical performance of HEA thin films, furthering the potential of HEAs as next-generation alloys.

Official source

https://infoscience.epfl.ch/entities/publication/47495382-09ea-49ae-a238-6c47da0965ec

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Johann Michler
2026

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/47495382-09ea-49ae-a238-6c47da0965ec

About this result

Related concepts (22)

Ultimate tensile strength

Ultimate tensile strength (also called UTS, tensile strength, TS, ultimate strength or in notation) is the maximum stress that a material can withstand while being stretched or pulled before breaking. In brittle materials the ultimate tensile strength is close to the yield point, whereas in ductile materials the ultimate tensile strength can be higher. The ultimate tensile strength is usually found by performing a tensile test and recording the engineering stress versus strain.

Specific strength

The specific strength is a material's (or muscle's) strength (force per unit area at failure) divided by its density. It is also known as the strength-to-weight ratio or strength/weight ratio or strength-to-mass ratio. In fiber or textile applications, tenacity is the usual measure of specific strength. The SI unit for specific strength is Pa⋅m3/kg, or N⋅m/kg, which is dimensionally equivalent to m2/s2, though the latter form is rarely used.

Compressive strength

In mechanics, compressive strength (or compression strength) is the capacity of a material or structure to withstand loads tending to reduce size (as opposed to tensile strength which withstands loads tending to elongate). In other words, compressive strength resists compression (being pushed together), whereas tensile strength resists tension (being pulled apart). In the study of strength of materials, tensile strength, compressive strength, and shear strength can be analyzed independently.

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High strength and plasticity of AlxCoCrFeNi/Al2O3 high-entropy alloy asymmetric nanolaminates

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