Abstract
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.
Original language | English |
---|---|
Article number | 142558 |
Journal | Materials Science and Engineering A |
Volume | 833 |
Number of pages | 11 |
ISSN | 0921-5093 |
DOIs | |
Publication status | Published - 2022 |
Keywords
- High-entropy alloys
- Recrystallization
- Microstructure
- Texture
- Mechanical properties