Enhanced strength-ductility synergy by high density heterogeneous precipitation microstructure in high-entropy alloys

被引：0
作者：
Li, Wei [1 ]
Zhang, Jianbao [1 ,2 ]
Cui, Dexu [1 ]
Wang, Xinxin [1 ]
Zhang, Pengfei [1 ]
Wang, Hanming [1 ]
Zhang, Yiwen [1 ]
Wang, Haifeng [1 ]
Kai, Ji-jung [2 ]
机构：
[1] Northwestern Polytech Univ, Ctr Adv Lubricant & Seal Mat, State Key Lab Solidificat Proc, Xian 710072, Shaanxi, Peoples R China
[2] City Univ Hong Kong, Ctr Adv Nucl Safety & Sustainable Dev, Hong Kong, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2025年 / 928卷
基金：
中国博士后科学基金;
关键词：
High-entropy alloys; Heterogeneous microstructure; Precipitation strengthening; Deformation mechanisms; MECHANICAL-PROPERTIES; CRYOGENIC STRENGTH; EVOLUTION; SIZE; TRANSFORMATION; MARTENSITE;
D O I：
10.1016/j.msea.2025.147983
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Heterogeneous microstructures have become a crucial method for high-entropy alloys (HEAs) to overcome the limitations of strength and plasticity synergy, as well as to explore other unique material properties or novel materials. Here, a strategy has been reported for breaking the strength-ductility trade-off by introducing nonmetallic element Si in Fe55Co15Cr10Al8Ni12-xSix (x = 0, 3 at. %) alloys system. The microstructure evolution and its effect on the mechanical properties were systematically analyzed and discussed. The results suggested that the addition of Si elements facilitates the transformation of the face-centered cubic (FCC) into body-centered cubic (BCC) microstructures, in which the spherical Al, Ni-rich B2 nanoparticles are coherently dispersed in the Fe, Cr-rich BCC matrix. Namely, the microstructure of HEA devoid of the Si element exhibits FCC + BCC dual- phase heterogeneous structures, while the microstructure evolves into a BCC-based B2 precipitation heterogeneous structures after adding Si. The B2 precipitates in alloys act as strengtheners that can block dislocation motion thus enhance the work hardening capability to strengthen materials. The heterogeneous precipitation microstructure resulting from Si alloying significantly elevates the mechanical properties of the alloy, which exhibit excellent strength of 1.4 GPa at room temperature with minimal sacrifice in plasticity. This strategy of utilizing B2 precipitation heterogeneous structures provides a promising way for the development of next- generation structural materials.
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页数：12
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  • [1] Clement C., Lu Y., Wharry J.P., Decoupling irradiation effects on deformation-induced martensitic transformations in commercial Ni-Cr-Fe alloys, Mater. Sci. Eng., A, 920, (2025)
  • [2] Dolph C.K., da Silva D.J., Swenson M.J., Wharry J.P., Plastic zone size for nanoindentation of irradiated Fe–9%Cr ODS, J. Nucl. Mater., 481, pp. 33-45, (2016)
  • [3] Wharry J.P., Swenson M.J., Yano K.H., A review of the irradiation evolution of dispersed oxide nanoparticles in the b.c.c. Fe-Cr system: current understanding and future directions, J. Nucl. Mater., 486, pp. 11-20, (2017)
  • [4] Wharry J.P., Was G.S., The mechanism of radiation-induced segregation in ferritic–martensitic alloys, Acta Mater., 65, pp. 42-55, (2014)
  • [5] Yeh J.W., Chen S.K., Lin S.J., Gan J.Y., Chin T.S., Shun T.T., Tsau C.H., Chang S.Y., Nanostructured high-entropy alloys with multiple principal elements: novel alloy design concepts and outcomes, Mater. Sci. Eng., A, 6, 5, pp. 299-303, (2004)
  • [6] Zhang Y., Hackett B.L., Dong J., Xie K.Y., Pharr G.M., Evolution of dislocation substructures in metals via high-strain-rate nanoindentation, Proc. Natl. Acad. Sci. U. S. A., 120, 50, (2023)
  • [7] Otto F., Dlouhy A., Somsen C., Bei H., Eggeler G., George E.P., The influences of temperature and microstructure on the tensile properties of a CoCrFeMnNi high-entropy alloy, Acta Mater., 61, 15, pp. 5743-5755, (2013)
  • [8] Shi Y., Ye W., Hua D., Zhou Q., Huang Z., Liu Y., Li S., Guo T., Chen Y., Eder S.J., Wang H., Interfacial engineering for enhanced mechanical performance: high-entropy alloy/graphene nanocomposites, Materials Today Physics, 38, (2023)
  • [9] Yan X., Liaw P.K., Zhang Y., Ultrastrong and ductile BCC high-entropy alloys with low-density via dislocation regulation and nanoprecipitates, J. Mater. Sci. Technol., 110, pp. 109-116, (2022)
  • [10] Shi P., Ren W., Zheng T., Ren Z., Hou X., Peng J., Hu P., Gao Y., Zhong Y., Liaw P.K., Enhanced strength–ductility synergy in ultrafine-grained eutectic high-entropy alloys by inheriting microstructural lamellae, Nat. Commun., 10, 1, (2019)
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