The Serrated-Flow Behavior in High-Entropy Alloys

TL;DR

This literature review summarizes the serrated flow phenomenon in high-entropy alloys, highlighting its dependence on testing conditions, composition, and microstructure, and discusses modeling techniques and future research directions.

Contribution

Provides a comprehensive overview of serrated flow in HEAs, including effects of testing parameters, analytical modeling methods, and future research topics.

Findings

Serrated flow varies with strain rate and temperature.

Different analytical methods have been used to model serration behavior.

Future studies should explore twinning and irradiation effects.

Abstract

This chapter presents a literature review of the serrated flow phenomenon in high-entropy alloys (HEAs). The serrated flow is important as it can result in permanent macroscopic and microstructural changes in HEAs. The literature reveals several important findings regarding the effect of strain rate and test temperature on the serrated flow. Furthermore, this chapter explores the relationship among the composition, microstructure, testing condition, and serration behavior. Towards the end of the chapter, a concise summary is presented for the temperature, strain rate, mechanical-testing type (compression/tension/nanoindentation), and serration type for HEAs. This chapter also provides an overview of the different types of analytical methods that have been successfully implemented to model and analyze the serration behavior in HEAs. Such techniques include the mean-field theory (MFT) formalism, complexity-analysis method, and multifractal technique. Finally, future research topics in this area are presented, such as the effects of twinning and irradiation on the serration behavior.