In situ analysis highlights dislocation-mediated plasticity and deformation mechanisms in alloy Fe36Ni18Mn33Al13, suggesting implications for strength and ductility.
Eutectic FeNiMnAl multi-principal element alloys exhibit exceptional strength–ductility synergy, yet their dynamic deformation mechanisms remain poorly characterized. This study employs in situ transmission electron microscopy to investigate dislocation-mediated plasticity in Fe36Ni18Mn33Al13—a lamellar FCC/B2 alloy with balanced properties. Real-time observations under tensile loading (at a strain rate of 0.1 μm/s, with a resolution of ~2 nm) reveal coordinated dislocation planar glide, cross-slip at obstacles, and pile-up formation at phase boundaries. Planar slip bands dominate early deformation, while cross-slip facilitates barrier bypass and strain homogenization. The coarse microstructure of Fe36Ni18Mn33Al13 promotes extensive dislocation storage, reducing strength but enhancing ductility compared to finer FeNiMnAl variants.
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Meng et al. (2025) studied this question.
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