Evolution of microstructure and mechanical properties during annealing of heavily rolled AlCoCrFeNi2. 1 eutectic high-entropy alloy
Journal article, 2022

Changes in the microstructure and mechanical properties during annealing at 800 °C have been characterized in a 90% cold-rolled AlCoCrFeNi2.1 eutectic high-entropy alloy containing the FCC and B2 (ordered BCC) phases. In the as-rolled condition, the FCC phase is found to contain a high frequency of finely spaced deformation-induced boundaries, which provides a high driving force for recrystallization within this phase. Quantitative analysis of electron backscatter diffraction data from the annealed samples indicates that recrystallization progresses faster in the FCC phase than in B2 regions. Although recrystallization leads to substantial coarsening of the microstructure, the average recrystallized grain size remains in the submicron range even after 2 h at 800 °C. Tensile test data demonstrate that combinations of high yield strength and good ductility are obtained in partially recrystallized samples produced by annealing for 2.5–10 min. However, the work-hardening capacity of each annealed sample is lower than that of the cold-rolled sample. Furthermore, for the samples annealed for at least 5 min a yield drop is observed soon after the onset of plastic deformation. Analysis of the microstructure and mechanical behavior in several annealed AlCoCrFeNi2.1 samples indicates a clear correlation between the magnitude of the yield drop and the recrystallized fraction. The mechanical behavior of the AlCoCrFeNi2.1 alloy studied in this work is compared with that reported in previous publications.



High-entropy alloys

Mechanical properties



Adrianna Lozinko

Chalmers, Industrial and Materials Science, Materials and manufacture

Reza Gholizadeh

Kyoto University

Yubin Zhang

Technical University of Denmark (DTU)

Uta Klement

Chalmers, Industrial and Materials Science, Materials and manufacture

Nobuhiro Tsuji

Kyoto University

Oleg V. Mishin

Technical University of Denmark (DTU)

Sheng Guo

Chalmers, Industrial and Materials Science, Materials and manufacture

Materials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing

0921-5093 (ISSN)

Vol. 833 142558

Eutectic high entropy alloys: a promising new class of high temperature alloys

Swedish Research Council (VR) (2015-04087), 2016-01-01 -- 2020-12-31.

Subject Categories

Applied Mechanics

Other Materials Engineering

Metallurgy and Metallic Materials


Chalmers Materials Analysis Laboratory

Areas of Advance

Materials Science



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