Abstract
Interfaces play a crucial role in strain hardening, slip accommodation, and plastic flow stability of dual-phase alloys. The orientation relationship (OR) between phases critically governs the crystallographic discontinuity and imposes geometric constraints on the activation of deformation modes. In dual-phase 19Al-20Fe-20Co-41Ni high-entropy alloys, we demonstrate that weakening the Kurdjumov-Sachs (K-S) OR between the L12 and B2 phases via moderate plastic deformation and recrystallization, significantly improves ductility without sacrificing strength. The threefold increase in ductility compared to the as-cast alloy is attributed to a B2→body-centered tetragonal (BCT) transformation, promoted by weakening the interface OR. In contrast, the as-cast alloy with K-S OR constrained B2 remains untransformed. In situ synchrotron tensile testing confirms the phase transformation evolves progressively. Our analysis of the expected strain contribution reveals that transformation preferentially occurs in B2 grains adjacent to highly deformable neighbors. These findings highlight the critical role of OR in governing phase transformation and deformation.
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References
Miracle, D. B. & Senkov, O. N. A critical review of high entropy alloys and related concepts. Acta Mater. 122, 448–511 (2017).
Lu, Y. et al. A promising new class of high-temperature alloys: eutectic high-entropy alloys. Sci. Rep. 4, 6200 (2014).
George, E. P., Curtin, W. A. & Tasan, C. C. High entropy alloys: a focused review of mechanical properties and deformation mechanisms. Acta Mater. 188, 435–474 (2020).
Ren, J. et al. Strong yet ductile nanolamellar high-entropy alloys by additive manufacturing. Nature 608, 62–68 (2022).
Yang, X. et al. Tensile properties and strengthening mechanisms of eutectic high-entropy alloys induced by heterostructure. Mater. Charact. 208, 113464 (2024).
Liu, T. et al. Formation of hypoeutectic structure and strengthening mechanism of Co4Cr1.5Fe1.5Ni5 high entropy alloy alloyed by Al. J. Alloy. Compd. 923, 166372 (2022).
Shi, P. et al. Strong-yet-ductile eutectic alloys employing cocoon-like nanometer-sized dislocation cells. Adv. Mater. 36, 2405459 (2024).
Li, H., Wang, J., Zhao, J., Li, J. & Fu, M. W. Phase transformation within dynamically refined microbands inducing ultrahigh and sustained strain hardening in high-entropy alloys containing L12 precipitates. Acta Mater. 289, 120930 (2025).
Yang, Z. et al. Discontinuous coarsening leads to unchanged tensile properties in high-entropy alloys with different recrystallization volume fractions. Int. J. Plast. 176, 103963 (2024).
Wang, M. Z., Shen, Y. F., Jia, N., Xue, W. Y. & Wang, Z. D. Ultrahigh strength triggered by BCC and B2 eutectic-phase interfaces in a novel FeCrVNiAl high-entropy alloy. Mater. Res. Lett. 12, 745–755 (2024).
Jain, S., Jain, R., Kumar, V., Samal, S. & Lee, J. Design strategies and mechanical behaviour of high-strength eutectic high-entropy alloys: a comprehensive review. J. Alloy. Compd. 1022, 180000 (2025).
Chang, X., Zeng, M., Liu, K. & Fu, L. Phase engineering of high-entropy alloys. Adv. Mater. 32, 1907226 (2020).
Li, Z., Pradeep, K. G., Deng, Y., Raabe, D. & Tasan, C. C. Metastable high-entropy dual-phase alloys overcome the strength–ductility trade-off. Nature 534, 227–230 (2016).
Shi, P. et al. Enhanced strength–ductility synergy in ultrafine-grained eutectic high-entropy alloys by inheriting microstructural lamellae. Nat. Commun. 10, 489 (2019).
Nutor, R. K. et al. A dual-phase alloy with ultrahigh strength-ductility synergy over a wide temperature range. Sci. Adv. 7, eabi4404 (2021).
Wu, X. L., Yang, M. X., Yuan, F. P., Chen, L. & Zhu, Y. T. Combining gradient structure and TRIP effect to produce austenite stainless steel with high strength and ductility. Acta Mater. 112, 337–346 (2016).
Zou, C. et al. Integrating data mining and machine learning to discover high-strength ductile titanium alloys. Acta Mater. 202, 211–221 (2021).
Haftlang, F., Seol, J. B., Zargaran, A., Moon, J. & Kim, H. S. Chemical core-shell metastability-induced large ductility in medium-entropy maraging and reversion alloys. Acta Mater. 256, 119115 (2023).
Sathiyamoorthi, P. & Kim, H. S. High-entropy alloys with heterogeneous microstructure: processing and mechanical properties. Prog. Mater. Sci. 123, 100709 (2022).
Wu, P. et al. Unexpected sluggish martensitic transformation in a strong and super-ductile high-entropy alloy of ultralow stacking fault energy. Acta Mater. 261, 119389 (2023).
Wang, X. et al. Design metastability in high-entropy alloys by tailoring unstable fault energies. Sci. Adv. 8, eabo7333 (2022).
Wu, Q. et al. Uncovering the eutectics design by machine learning in the Al–Co–Cr–Fe–Ni high entropy system. Acta Mater. 182, 278–286 (2020).
Cheng, B. et al. Pressure-induced phase transition in the AlCoCrFeNi high-entropy alloy. Scr. Mater. 161, 88–92 (2019).
Wang, L. et al. Abundant polymorphic transitions in the Al0.6CoCrFeNi high-entropy alloy. Mater. Today Phys. 8, 1–9 (2019).
Wang, J., Zhou, Q., Shao, S. & Misra, A. Strength and plasticity of nanolaminated materials. Mater. Res. Lett. 5, 1–19 (2017).
Zhang, Z., Tang, Y., Zhao, Q., Huang, Q. & Zhou, H. Theoretical modeling of phase boundary mediated extra tensile strength and plasticity in high entropy alloys. J. Mech. Phys. Solids 200, 106106 (2025).
Wang, J. & Misra, A. Plastic homogeneity in nanoscale heterostructured binary and multicomponent metallic eutectics: an overview. Curr. Opin. Solid State Mater. Sci. 27, 101055 (2023).
Shao, S., Zhou, C., Misra, A. & Wang, J. Mesoscale Modeling of Dislocation-Interactions in Multilayered Materials. in Handbook of Materials Modeling (eds Andreoni, W. & Yip, S.) 1049–1078 (Springer International Publishing, Cham, 2020).
Liu, G., Wang, S., Misra, A. & Wang, J. Interface-mediated plasticity of nanoscale Al–Al2Cu eutectics. Acta Mater. 186, 443–453 (2020).
He, J. et al. Microstructure evolution and deformation behavior of Au–20Sn eutectic alloy during hot rolling process. J. Alloy. Compd. 831, 154824 (2020).
Sun, Y. et al. Atomic-level study of AuSn–Au5Sn eutectic interfaces. Appl. Phys. Lett. 120, 011603 (2022).
Sun, Y. et al. Uncovering deformation twins in intermetallic AuSn and Au5Sn. Acta Mater. 265, 119603 (2024).
Wang, J. & Misra, A. Strain hardening in nanolayered thin films. Curr. Opin. Solid State Mater. Sci. 18, 19–28 (2014).
Shu, Q. et al. A gradient B2-BCT transition introduced by deformation in eutectic high-entropy alloy. Mater. Lett. 366, 136549 (2024).
Wu, Q. et al. Phase-selective recrystallization makes eutectic high-entropy alloys ultra-ductile. Nat. Commun. 13, 4697 (2022).
Cai, W. et al. Enhanced strength-ductility synergy in medium entropy alloy via phase selective precipitation. Int. J. Plast. 184, 104204 (2025).
Brodie, J. et al. Stability of the B2 phase in refractory high entropy alloys containing aluminum. Acta Mater. 268, 119745 (2024).
Ma, L. et al. Microstructure and mechanical property of Al56-xCo24Cr20Nix eutectic high-entropy alloys with an ordered FCC/BCT phase structure. J. Alloy. Compd. 936, 168194 (2023).
Xu, N. et al. A novel CoCrNiAl duplex phase high entropy alloy featuring body-centered tetragonal structure. Intermetallics 185, 108868 (2025).
Ma, L., Wang, J. & Jin, P. Microstructure and mechanical properties variation with Ni content in Al0.8CoCr0.6Fe0.7Nix (x = 1.1, 1.5, 1.8, 2.0) eutectic high-entropy alloy system. Mater. Res. Express 7, 016566 (2020).
Lu, Y. et al. Directly cast bulk eutectic and near-eutectic high entropy alloys with balanced strength and ductility in a wide temperature range. Acta Mater. 124, 143–150 (2017).
Han, Q. et al. FCC/B2 phase boundary variant-sensitive fatigue cracking in a eutectic high entropy alloy at high temperature. Int. J. Plast. 185, 104223 (2025).
Gwalani, B. et al. Influence of ordered L12 precipitation on strain-rate dependent mechanical behavior in a eutectic high entropy alloy. Sci. Rep. 9, 6371 (2019).
Ji, W. et al. Designing maximal strength in nanolamellar eutectic high-entropy alloys. Adv. Mater. 2500149 (2025).
Zheng, M., Li, C., Liao, Y., Long, Z. & Gu, J. Hierarchical multiphase microstructure in additively manufactured (CoCrNi)83Al17 multi-principal element alloy with high strength. Scr. Mater. 263, 116655 (2025).
Wang, X., Zhai, W., Li, H., Wang, J. Y. & Wei, B. Ultrasounds induced eutectic structure transition and associated mechanical property enhancement of FeCoCrNi2.1Al high entropy alloy. Acta Mater. 252, 118900 (2023).
Wang, X., Zhai, W., Wang, J. Y. & Wei, B. Strength and ductility enhancement of high-entropy FeCoNi2Al0.9 alloy by ultrasonically refining eutectic structures. Scr. Mater. 225, 115154 (2023).
Li, H. et al. Achieving superior ductility with ultrahigh strength via deformation and strain hardening in the non-recrystallized regions of the heterogeneous-structured high-entropy alloy. Acta Mater. 283, 120572 (2025).
Acknowledgements
The authors gratefully acknowledge the financial support by the National Key Research and Development Program of China (grant no. 2022YFB370710, B.Z.) and the National Natural Science Foundation of China (grant 52171042, C.L.).
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B.Z., Q.S., and J.W. proposed the conceptualization, X.D., L.Z., and B.Z. supervised the project, Q.S., C.D., Y.L., N.S., and C.L. conducted the experimental study. B.Z., Q.S., and J.W. wrote the original draft and revised the paper. All authors contributed to the discussion.
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Communications Materials thanks Zhiming Li and the other anonymous reviewer(s) for their contribution to the peer review of this work. A peer review file is available.
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Shu, Q., Ding, X., Lu, Y. et al. Threefold enhancement of ductility in dual-phase L1₂–B2 high-entropy alloys via interface-orientation-weakening-induced B2→BCT phase transformation. Commun Mater (2026). https://doi.org/10.1038/s43246-026-01088-y
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DOI: https://doi.org/10.1038/s43246-026-01088-y
