University of Oulu

Patnamsetty, M., Ghosh, S., Somani, M. C., & Peura, P. (2022). Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map. Journal of Alloys and Compounds, 914, 165341.

Characterization of hot deformation behavior of Al0.3CoCrFeNi high-entropy alloy and development of processing map

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Author: Patnamsetty, Madan1; Ghosh, Sumit2; Somani, Mahesh C.2;
Organizations: 1Materials Science and Environmental Engineering, Tampere University, 33720 Tampere, Finland
2Materials and Mechanical Engineering, Centre for Advanced Steels Research, University of Oulu, 90014 Oulu, Finland
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 38.7 MB)
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Language: English
Published: Elsevier, 2022
Publish Date: 2022-09-09


This study presents the characteristics of hot deformation behavior of a Al0.3CoCrFeNi high–entropy alloy in the temperature and strain rate ranges of 1023–1423 K and 10–3–10 s–1, respectively. The constitutive flow behavior was modeled based on the hyperbolic–sinusoidal Arrhenius–type equations and a mathematical relation was used to observe the influence of true strain on material constants. To define the hot workability of the alloy, a processing map was developed based on the principles of the dynamic materials model. Accordingly, a dynamic recrystallization (DRX) domain was identified as prudent for processing in the temperature and strain rate ranges of 1273–1423 K and 10–2–2 × 10–1 s–1 respectively, with a peak efficiency of ~45% at 1423 K/6 × 10–2 s–1. At lower temperatures (1048–1148 K) and strain rates (10–3–3 × 10–3 s–1), a dynamic recovery (DRV) domain was identified with a peak efficiency of 38% at 1123 K/10–3 s–1. A large instability regime occurred above 3 × 10–1 s–1 with an increased tendency of adiabatic shear bands. It extended to lower strain rates 10–2–10–1 s–1 at temperatures < 1123 K, manifested by localized shear bands and grain boundary cracking. At low strain rates (5 × 10–3–10–3 s–1) and temperatures (1148–1298 K), particle stimulated nucleation of new DRX grains occurred at B2 precipitates, though the efficiency of power dissipation dropped sharply to ∼9%.

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Series: Journal of alloys and compounds
ISSN: 0925-8388
ISSN-E: 1873-4669
ISSN-L: 0925-8388
Issue: 914
Article number: 165341
DOI: 10.1016/j.jallcom.2022.165341
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Dataset Reference: Supplementary data associated with this article can be found in the online version at doi:10.1016/j.jallcom.2022.165341.
Copyright information: © 2022 The Author(s). CC_BY_4.0.