On the development of a novel multi-phase high entropy alloy with transformation-induced plasticity effect

•Enhancement of the yield strength up to 1 GPa along with a ductility of 10% is achieved after thermo-mechanical processing of a novel HEA.•TRIP and thermally induced recrystallization are shown to be influential in dictating the resulting mechanical behavior of this multiphase HEA.•The extent of th...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-06, Vol.905, p.164014, Article 164014
Main Authors: Radi, Amin, Asghari-Rad, Peyman, Kim, Hyoung Seop, Yapici, Guney Guven
Format: Article
Language:English
Subjects:
Annealing
Evolution
Heat of transformation
Heterogeneous structure
High entropy alloy (HEA)
High entropy alloys
Mechanical analysis
Mechanical behavior
Mechanical properties
Microstructure
Multi-phase
Multiphase
Phase distribution
Plastic deformation
Plastic properties
Recrystallization
Sigma phase
Thermo-mechanical processing
Thermomechanical treatment
Transformation-induced plasticity (TRIP)
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Summary:•Enhancement of the yield strength up to 1 GPa along with a ductility of 10% is achieved after thermo-mechanical processing of a novel HEA.•TRIP and thermally induced recrystallization are shown to be influential in dictating the resulting mechanical behavior of this multiphase HEA.•The extent of the TRIP mechanism is strongly related to the adjustment of pertinent thermo-mechanical processing parameters.•Synergistic deformation mechanisms involving dislocation slip and phase transformation operate for improved strain hardening ability. In the present work, microstructural evolution, and mechanical behavior of a novel high entropy alloy (HEA) are investigated through thermo-mechanical processing. The homogenized samples possess a single-phase cubic structure with high ductility. The rolled and subsequently annealed samples at various treatment conditions exhibit multi-phase microstructures. This study confirms that the sigma phase contribution becomes more significant on the mechanical response at higher annealing temperatures. Effects of phase distribution and degree of recrystallization on the microstructural evolution are examined in detail to probe the variation in the mechanical response. Samples subjected to annealing exhibit transformation-induced plasticity (TRIP) under plastic deformation. As such, the designed TRIP-assisted multi-phase HEA enables a combination of 1 GPa yield strength and about 10% of strain at failure.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.164014