Achieving Alloys with Concurrent High Strength and High Ductility
Received date: 2024-12-16
Revised date: 2025-01-07
Online published: 2025-01-09
Supported by
National Natural Sciences Foundation of China(52231001);National Natural Sciences Foundation of China(52371162);National Natural Science Fund for Excellent Young Scientists Fund Program (Overseas)
Increasing the yield strength of metallic materials is observed to almost always substantially reduce their tensile ductility. Here we unravel the origin of this perplexing “strength-ductility trade-off”, and conclude that this dilemma does not necessarily preclude concurrent high strength and high ductility. We discuss several strengthening and work hardening mechanisms that regulate dislocation behavior, including traditional ones that have been pushed to their extreme in recent years, as well as new ones that take advantage of the heightened structural and chemical heterogeneities; all these mechanisms are rendered more powerful by emerging complex concentrated alloys that bring in multiple principal elements. These mechanisms, while offering elevated strength, contribute to sustainable strain hardening under high flow stresses, delaying strain localization to allow prolonged uniform elongation. The current status in the pursuit for concurrent high strength and high ductility is reviewed. The goal we set for high yield strength ~2 GPa (rivaling super steels) together with large uniform elongation ~30% (much like un-strengthened elemental metals) is projected to be soon within reach. These take-home messages shed light on some existing puzzles regarding the strength-ductility synergy, and offer new insight into the innovative design of alloys.
MA En (MA Evan) , LIU Chang . Achieving Alloys with Concurrent High Strength and High Ductility[J]. Acta Metall Sin, 2025 , 61(5) : 665 -673 . DOI: 10.11900/0412.1961.2024.00422
| 1 | Ma E, Zhu T. Towards strength-ductility synergy through the design of heterogeneous nanostructures in metals [J]. Mater. Today, 2017, 20: 323 |
| 2 | Zhang Z J, Qu Z, Xu L, et al. Relationship between strength and uniform elongation of metals based on an exponential hardening law [J]. Acta Mater., 2022, 231: 117866 |
| 3 | Liu X R, Feng H, Wang J, et al. Mechanical property comparisons between CrCoNi medium-entropy alloy and 316 stainless steels [J]. J. Mater. Sci. Technol., 2022, 108: 256 |
| 4 | Shi P J, Li R G, Li Y, et al. Hierarchical crack buffering triples ductility in eutectic herringbone high-entropy alloys [J]. Science, 2021, 373: 912 |
| 5 | Yang T, Zhao Y L, Tong Y, et al. Multicomponent intermetallic nanoparticles and superb mechanical behaviors of complex alloys [J]. Science, 2018, 362: 933 |
| 6 | Hart E W. Theory of the tensile test [J]. Acta Metall., 1967, 15: 351 |
| 7 | Hutchinson J W, Neale K W. Influence of strain-rate sensitivity on necking under uniaxial tension [J]. Acta Metall., 1977, 25: 839 |
| 8 | Li Z M, Pradeep K G, Deng Y, et al. Metastable high-entropy dual-phase alloys overcome the strength-ductility trade-off [J]. Nature, 2016, 534: 227 |
| 9 | Yang Y, Chen T Y, Tan L Z, et al. Bifunctional nanoprecipitates strengthen and ductilize a medium-entropy alloy [J]. Nature, 2021, 595: 245 |
| 10 | Wei D X, Wang L Q, Zhang Y J, et al. Metalloid substitution elevates simultaneously the strength and ductility of face-centered-cubic high-entropy alloys [J]. Acta Mater., 2022, 225: 117571 |
| 11 | Wang Y M, Chen M W, Zhou F H, et al. High tensile ductility in a nanostructured metal [J]. Nature, 2002, 419: 912 |
| 12 | Wu X L, Yuan F P, Yang M X, et al. Nanodomained nickel unite nanocrystal strength with coarse-grain ductility [J]. Sci. Rep., 2015, 5: 11728 |
| 13 | Wu X L, Yang M X, Yuan F P, et al. Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility [J]. Proc. Natl. Acad. Sci. USA, 2015, 112: 14501 |
| 14 | Li X Y, Lu L, Li J G, et al. Mechanical properties and deformation mechanisms of gradient nanostructured metals and alloys [J]. Nat. Rev. Mater., 2020, 5: 706 |
| 15 | Ashby M F. The deformation of plastically non-homogeneous materials [J]. Philos. Mag., 1970, 21: 399 |
| 16 | Miracle D B, Senkov O N. A critical review of high entropy alloys and related concepts [J]. Acta Mater., 2017, 122: 448 |
| 17 | Ma E, Liu C. Chemical inhomogeneities in high-entropy alloys help mitigate the strength-ductility trade-off [J]. Prog. Mater. Sci., 2024, 143: 101252 |
| 18 | Ma E, Ding J. Compositional fluctuation and local chemical ordering in multi-principal element alloys [J]. J. Mater. Sci. Technol., 2025, 220: 233 |
| 19 | Wang L, Ding J, Chen S S, et al. Tailoring planar slip to achieve pure metal-like ductility in body-centred-cubic multi-principal element alloys [J]. Nat. Mater., 2023, 22: 950 |
| 20 | Ding Q Q, Zhang Y, Chen X, et al. Tuning element distribution, structure and properties by composition in high-entropy alloys [J]. Nature, 2019, 574: 223 |
| 21 | Li Q J, Sheng H, Ma E. Strengthening in multi-principal element alloys with local-chemical-order roughened dislocation pathways [J]. Nat. Commun., 2019, 10: 3563 |
| 22 | Chen X F, Wang Q, Cheng Z Y, et al. Direct observation of chemical short-range order in a medium-entropy alloy [J]. Nature, 2021, 592: 712 |
| 23 | Jiao M Y, Lei Z F, Wu Y, et al. Manipulating the ordered oxygen complexes to achieve high strength and ductility in medium-entropy alloys [J]. Nat. Commun., 2023, 14: 806 |
| 24 | Bu Y Q, Wu Y, Lei Z F, et al. Local chemical fluctuation mediated ductility in body-centered-cubic high-entropy alloys [J]. Mater. Today, 2021, 46: 28 |
| 25 | An Z B, Li A, Mao S C, et al. Negative mixing enthalpy solid solutions deliver high strength and ductility [J]. Nature, 2024, 625: 697 |
| 26 | Li H, Zong H X, Li S Z, et al. Uniting tensile ductility with ultrahigh strength via composition undulation [J]. Nature, 2022, 604: 273 |
| 27 | Han L L, Maccari F, Souza Filho I R, et al. A mechanically strong and ductile soft magnet with extremely low coercivity [J]. Nature, 2022, 608: 310 |
| 28 | Yang T, Zhao Y L, Li W P, et al. Ultrahigh-strength and ductile superlattice alloys with nanoscale disordered interfaces [J]. Science, 2020, 369: 427 |
| 29 | Chen E Z, Tamm A, Wang T, et al. Modeling antiphase boundary energies of Ni3Al-based alloys using automated density functional theory and machine learning [J]. npj Comput. Mater., 2022, 8: 80 |
| 30 | Meng C G, Guo J T, Hu Z Q. Mechanism of macroalloying-induced ductility in Ni3Al [J]. J. Mater. Sci. Technol., 1994, 10: 279 |
| 31 | Chiba A, Hanada S, Watanabe S. Improvement in ductility of Ni3Al by γ former doping [A]. High Temperature Aluminides and Intermetallics [M]. London: Elsevier, 1992: 108 |
| 32 | Lü B L, Chen G Q, Qu S, et al. Effect of alloying elements on <111> dislocation in NiAl: A first-principles study [J]. Physica, 2013, 417B: 9 |
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