“…These ill-defined wavy substructures were more related to the stage of multiple slips with a higher M L . This was also verified by the results for low-cycle fatigue in FCC CoCrFeMnNi high-entropy alloys [41].…”
Section: δM L Model Based On Dislocation Evolution and Slip Modesupporting
“…These ill-defined wavy substructures were more related to the stage of multiple slips with a higher M L . This was also verified by the results for low-cycle fatigue in FCC CoCrFeMnNi high-entropy alloys [41].…”
Section: δM L Model Based On Dislocation Evolution and Slip Modesupporting
“…The thermal/fluidic edge effects at the contact of molten pool and powder beds lead to near-surface defects, [207] which would degrade the fatigue performance of 3D-printed components. [208] Though several researchers have studied the cyclic plasticity of conventionally produced HEAs, [9,[209][210][211][212][213] the corresponding exploration of 3D-printed HEAs is relatively nascent and scarce in contemporary materials science. [214] Since the microstructure of the 3D-printed metals is primarily different from traditionally manufactured materials, [208] their fatigue properties pose a wide research gap with tremendous potential.…”
The 3D‐printing of high‐entropy alloys (HEAs) is capable of enhancing the design and manufacturing flexibilities for the novel materials. Owing to the rapid solidification, the 3D‐printed HEAs exhibit markedly different microstructures than their conventionally‐manufactured equivalents, leading to peculiar mechanical properties. Many additively‐manufactured HEAs also break down the strength‐ductility trade‐off dilemma. Novel dynamics regarding the simultaneous and sequential nature of deformation mechanisms are emerging through recent intensive research on these materials. Herein the deformation behavior of 3D‐printed HEAs is reviewed and explained on the basis of the latest advances in this area. A comprehensive picture regarding the role of cellular dislocation networks, twinning‐induced plasticity (TWIP), and transformation‐induced plasticity (TRIP) in the monotonic and cyclic deformation of 3D‐printed HEAs is presented. Special emphasis is placed on fatigue characteristics due to the enormous interest in this burgeoning area. The effect of post‐fabrication thermomechanical processing on plasticity is discussed along with the microstructural evolution in the 3D‐printed HEAs. Several innovative developments that carry latent potential for further research are also deliberated in this review. Finally, the present understanding of the deformation behavior of 3D‐printed HEAs is summarized while gauging the future directions.This article is protected by copyright. All rights reserved.
“… Fig. 5 Graphical compilation of low-cycle fatigue data of high-entropy alloys at the temperature of T = 298 K and strain ratio of R = −1 27 – 34 . ( a ) Total strain amplitude.…”
Fatigue failure of metallic structures is of great concern to industrial applications. A material will not be practically useful if it is prone to fatigue failures. To take the advantage of lately emerged high-entropy alloys (HEAs) for designing novel fatigue-resistant alloys, we compiled a fatigue database of HEAs from the literature reported until the beginning of 2022. The database is subdivided into three categories, i.e., low-cycle fatigue (LCF), high-cycle fatigue (HCF), and fatigue crack growth rate (FCGR), which contain 15, 23, and 28 distinct data records, respectively. Each data record in any of three categories is characteristic of a summary, which is comprised of alloy compositions, key fatigue properties, and additional information influential to, or interrelated with, fatigue (e.g., material processing history, phase constitution, grain size, uniaxial tensile properties, and fatigue testing conditions), and an individual dataset, which makes up the original fatigue testing curve. Some representative individual datasets in each category are graphically visualized. The dataset is hosted in an open data repository, Materials Cloud.
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