Scaling and Complexity of Stress Fluctuations Associated with Smooth and Jerky Flow in FeCoNiTiAl High-Entropy Alloy

Recent observations of jerky flow in high-entropy alloys (HEA) revealed a high role of self-organization of dislocations in their plasticity. The present work reports the first results of the investigation of stress fluctuations during plastic deformation of an FeCoNiTiAl alloy, examined in a wide t...

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Bibliographic Details
Published in:Metals (Basel ) 2023-10, Vol.13 (10), p.1770
Main Authors: Lebyodkin, Mikhail, Brechtl, Jamieson, Lebedkina, Tatiana, Wen, Kangkang, Liaw, Peter K., Shen, Tongde
Format: Article
Language:English
Subjects:
Alloys
Analysis
complexity
Deformation
Engineering Sciences
Entropy
High entropy alloys
Investigations
MATERIALS SCIENCE
mesoscopic-scale plasticity
Microstructure
Nonlinear Sciences
Plastic deformation
Plastic flow
Plastic properties
serrated flow
Specialty metals industry
Spectrum analysis
statistical analysis
Time series
Work hardening
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Summary:Recent observations of jerky flow in high-entropy alloys (HEA) revealed a high role of self-organization of dislocations in their plasticity. The present work reports the first results of the investigation of stress fluctuations during plastic deformation of an FeCoNiTiAl alloy, examined in a wide temperature range covering both smooth and jerky flow. These fluctuations, which accompany the overall deformation behavior representing an essentially slower stress evolution controlled by the work hardening, were processed using complementary approaches comprising Fourier spectral analysis, refined composite multiscale entropy, and multifractal formalisms. The joint analysis at distinct scales testified that even a macroscopically smooth plastic flow is accompanied by nonrandom fluctuations, disclosing the self-organized dynamics of dislocations. Qualitative changes in such a fine-scale “noise” were found with varying temperature. The observed diversity is significant for understanding the relationships between different scales of plasticity of HEAs and crystal materials in general.
ISSN:2075-4701
2075-4701
DOI:10.3390/met13101770