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Cyclic suppression of chemical short-range ordering enhances fatigue resistance via phase transformation in CrCoNi medium-entropy alloy
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DOI：10.1016/j.mattod.2026.103374.png)
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Abstract
En 中文
Local chemical short-range ordering (SRO) is a subtle yet pervasive form of atomic-scale heterogeneity that modulates defect kinetics and can significantly influence the mechanical properties of multi-principal-element alloys (MPEAs). However, its dynamic behavior under cyclic loading remains largely unexplored, limiting the ability to design durable MPEAs. Here, we find that cyclic deformation fundamentally alters the kinetics of SRO in an equiatomic CrCoNi MPEA, establishing a new regime of mechanically restrained ordering. Unlike monotonic tension, which promotes defect-assisted ordering, cyclic loading suppresses SRO due to reversible dislocation glide. Chemical disorder persists in quenched alloys with low stacking-fault energy (SFE), thereby promoting the face-centered cubic-to-hexagonal close-packed phase transformation. In contrast, diffusion-induced SRO in aged alloys elevates the SFE, favoring deformation twinning. Transformation-mediated plasticity enables sustained hardening and delayed accumulation of damage, thereby suppressing cyclic softening and enhancing fatigue resistance. The interplay between SRO kinetics, SFE, and deformation mode defines a new design principle for fatigue-resistant advanced alloys through dynamic order–disorder transitions.
Keywords:
chemical short-range ordering
cyclic loading
fatigue resistance
phase transformation
CrCoNi alloy
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