Abstract
An equal-molar CoCrFeMnNi, face-centered-cubic (fcc) high-entropy alloy (HEA) and a nickel-based superalloy are studied using in situ neutron diffraction experiments. With continuous measurements, the evolution of diffraction peaks is collected for microscopic lattice strain analyses. Cyclic hardening and softening are found in both metallic systems. However, as obtained from the diffraction-peak-width evolution, the underneath deformation mechanisms are quite different. The CoCrFeMnNi HEA exhibits distinct lattice strain and microstructure responses under tension-compression cyclic loadings.
Highlights
Fracture toughness and fatigue behavior are the key to the practical applications of high entropy alloys (HEAs) [1]
Thurston et al [5] report that fatigue behavior of the Cantor alloy is comparable to the austenitic stainless steels and twinning induced plasticity (TWIP) steels
There are few reports revealing the polymorphism of CoCrFeMnNi, which is induced by tension [7] and compression [8,9,10], respectively
Summary
Fracture toughness and fatigue behavior are the key to the practical applications of high entropy alloys (HEAs) [1]. Despite the convenience of four-point-bending high-cycle fatigue (HCF), more detailed fatigue mechanisms, especially in the low-cycle fatigue (LCF) in HEAs, need to be further explored, since the deformation behaviors under HCF and LCF regimes are very different, as suggested by Chen et al.’s review [4]. Thurston et al [5] report that fatigue behavior of the Cantor alloy is comparable to the austenitic stainless steels and twinning induced plasticity (TWIP) steels. There are few reports revealing the polymorphism of CoCrFeMnNi, which is induced by tension [7] and compression [8,9,10], respectively. The cyclic tension-compression effects as well as predominant mechanisms during the LCF process in CoCrFeMnNi still remain elusive
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