Serration behavior and brittle phase-induced mechanical transitions in wrought Al0.3CoCrFeNi high-entropy alloy from 100 °C to 800 °C

Yaqi Wu; Jamieson Brechtl; Changwei Li; Peter K. Liaw; Guihong Geng; Yong Zhang

doi:10.1016/j.msea.2025.148261

Serration behavior and brittle phase-induced mechanical transitions in wrought Al_0.3CoCrFeNi high-entropy alloy from 100 °C to 800 °C

Yaqi Wu
, Jamieson Brechtl
, Changwei Li
, Peter K. Liaw
, Guihong Geng
, Yong Zhang

Multifunctional Equipment Integration

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

In this work, the serrated flows and temperature-dependent behavior of Al_0.3CoCrFeNi were investigated. The refined composite multiscale entropy (RCMSE) method was used to model and analyze the serration behavior. The results revealed that serrated flow exhibited dynamically complex behavior, with complexity increasing with temperature. Experimental results showed that the serration type changed from type-A (regular, high-frequency serrations associated with dynamic strain aging (DSA) effects) and type B (irregular, medium-frequency serrations linked to localized dislocation motion) to type-C (low-frequency, large-amplitude serrations caused by interactions between deformation twins and dislocations) between 300 °C and 600 °C due to the transition from dynamic strain aging (DSA) effects to interactions between deformation twins and dislocations. Additionally, grain boundary segregation led to a transition from ductile to brittle fracture at 700 °C. These findings highlight the significance of understanding serration and temperature-dependent behaviors during the deformation of the Al_0.3CoCrFeNi alloy, which is crucial for research on the temperature-dependent failure and application of high-entropy alloys.

Original language	English
Article number	148261
Journal	Materials Science and Engineering: A
Volume	932
DOIs	https://doi.org/10.1016/j.msea.2025.148261
State	Published - Jun 2025

Funding

The author, Yaqi Wu, would like to thank Professor Gerhard Wild for his review of the paper. This work is supported by the National Natural Science Foundation of China (No.52273280); the Creative Research Groups of China (No.51921001); the National Science Foundation (DMR – 1611180, 1809640, and 2226508) and the Army Research Office (W911NF-13–1-0438 and W911NF-19–2-0049).

Keywords

Brittle fracture
High-entropy alloys
Serration behavior
Serration simulation
Temperature dependence

Access to Document

10.1016/j.msea.2025.148261

Cite this

@article{f884b6fab63c4d38b54a2db28a2e260f,

title = "Serration behavior and brittle phase-induced mechanical transitions in wrought Al0.3CoCrFeNi high-entropy alloy from 100 °C to 800 °C",

abstract = "In this work, the serrated flows and temperature-dependent behavior of Al0.3CoCrFeNi were investigated. The refined composite multiscale entropy (RCMSE) method was used to model and analyze the serration behavior. The results revealed that serrated flow exhibited dynamically complex behavior, with complexity increasing with temperature. Experimental results showed that the serration type changed from type-A (regular, high-frequency serrations associated with dynamic strain aging (DSA) effects) and type B (irregular, medium-frequency serrations linked to localized dislocation motion) to type-C (low-frequency, large-amplitude serrations caused by interactions between deformation twins and dislocations) between 300 °C and 600 °C due to the transition from dynamic strain aging (DSA) effects to interactions between deformation twins and dislocations. Additionally, grain boundary segregation led to a transition from ductile to brittle fracture at 700 °C. These findings highlight the significance of understanding serration and temperature-dependent behaviors during the deformation of the Al0.3CoCrFeNi alloy, which is crucial for research on the temperature-dependent failure and application of high-entropy alloys.",

keywords = "Brittle fracture, High-entropy alloys, Serration behavior, Serration simulation, Temperature dependence",

author = "Yaqi Wu and Jamieson Brechtl and Changwei Li and Liaw, \{Peter K.\} and Guihong Geng and Yong Zhang",

note = "Publisher Copyright: {\textcopyright} 2025 Elsevier B.V.",

year = "2025",

month = jun,

doi = "10.1016/j.msea.2025.148261",

language = "English",

volume = "932",

journal = "Materials Science and Engineering: A",

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publisher = "Elsevier",

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T1 - Serration behavior and brittle phase-induced mechanical transitions in wrought Al0.3CoCrFeNi high-entropy alloy from 100 °C to 800 °C

AU - Wu, Yaqi

AU - Brechtl, Jamieson

AU - Li, Changwei

AU - Liaw, Peter K.

AU - Geng, Guihong

AU - Zhang, Yong

PY - 2025/6

Y1 - 2025/6

N2 - In this work, the serrated flows and temperature-dependent behavior of Al0.3CoCrFeNi were investigated. The refined composite multiscale entropy (RCMSE) method was used to model and analyze the serration behavior. The results revealed that serrated flow exhibited dynamically complex behavior, with complexity increasing with temperature. Experimental results showed that the serration type changed from type-A (regular, high-frequency serrations associated with dynamic strain aging (DSA) effects) and type B (irregular, medium-frequency serrations linked to localized dislocation motion) to type-C (low-frequency, large-amplitude serrations caused by interactions between deformation twins and dislocations) between 300 °C and 600 °C due to the transition from dynamic strain aging (DSA) effects to interactions between deformation twins and dislocations. Additionally, grain boundary segregation led to a transition from ductile to brittle fracture at 700 °C. These findings highlight the significance of understanding serration and temperature-dependent behaviors during the deformation of the Al0.3CoCrFeNi alloy, which is crucial for research on the temperature-dependent failure and application of high-entropy alloys.

AB - In this work, the serrated flows and temperature-dependent behavior of Al0.3CoCrFeNi were investigated. The refined composite multiscale entropy (RCMSE) method was used to model and analyze the serration behavior. The results revealed that serrated flow exhibited dynamically complex behavior, with complexity increasing with temperature. Experimental results showed that the serration type changed from type-A (regular, high-frequency serrations associated with dynamic strain aging (DSA) effects) and type B (irregular, medium-frequency serrations linked to localized dislocation motion) to type-C (low-frequency, large-amplitude serrations caused by interactions between deformation twins and dislocations) between 300 °C and 600 °C due to the transition from dynamic strain aging (DSA) effects to interactions between deformation twins and dislocations. Additionally, grain boundary segregation led to a transition from ductile to brittle fracture at 700 °C. These findings highlight the significance of understanding serration and temperature-dependent behaviors during the deformation of the Al0.3CoCrFeNi alloy, which is crucial for research on the temperature-dependent failure and application of high-entropy alloys.

KW - Brittle fracture

KW - High-entropy alloys

KW - Serration behavior

KW - Serration simulation

KW - Temperature dependence

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