Fatigue Behavior of High-Entropy Alloys

TL;DR

This paper reviews the recent progress in understanding the fatigue behavior of high-entropy alloys, highlighting experimental findings, theoretical insights, and future research directions in this emerging field.

Contribution

It provides a comprehensive summary of experimental and theoretical studies on HEA fatigue behavior over the past decade, including models and unresolved issues.

Findings

HEAs exhibit superior fatigue properties compared to conventional alloys

Processing and testing methods significantly influence HEA fatigue performance

Prediction models vary in accuracy and need further refinement

Abstract

High-entropy alloys (HEAs) refer to alloys composed of five or more elements in equal or near-equal amounts or in an atomic concentration range of 5 to 35 atomic percent (at%). Different elemental ratios will affect the microstructures of HEAs and provide them with unique properties. Based on past research, HEAs have exhibited superior performance, relative to most conventional alloys, with respect to many properties, such as strength, toughness, corrosion resistance, magnetic behavior, etc. Among them, fatigue behavior has been a topic of focus, due to its importance in industrial applications. In this article, we summarized the research progress in the HEA-fatigue behavior in the past ten years, including experimental results and theoretical studies in subdivisions, such as high-cycle fatigue, low-cycle fatigue, fatigue-crack growth, fatigue mechanisms, etc. The influence of the processing and test methods on HEAs is described. The accuracy of several commonly used prediction models is also outlined. Finally, unresolved issues and suggestions on the direction of future research efforts are presented.