梯度异质结构CoCrNi中熵合金的设计及变形机理研究

梯度异质结构CoCrNi中熵合金的设计及变形机理研究

罗仙敏，苏鸿宏，安子冰，毛圣成^*，张  泽，韩晓东

(1. 北京工业大学材料与制造学部，北京100124；2. 浙江大学材料科学与工程学院，浙江 杭州 310027 )

摘  要  CoCrNi是一种典型的中熵合金，其具有塑性高但拉伸强度较低的特点，这种强塑性权衡问题限制了其工程应用范围。本文采用轧制退火和旋转加速喷丸工艺，在CrCoNi中熵合金中引入梯度晶粒尺寸和孪晶的异质结构。结果表明，这种设计实现了优良的强塑性，其屈服强度和抗拉强度分别为665 MPa和950 MPa，同时断裂塑性达到40.6 %。在拉伸变形过程中，梯度晶粒异质结构能够产生非均匀变形诱导硬化，提升合金屈服强度的同时，保持高的加工硬化率和优异的延展性。因此，基于轧制退火和旋转喷丸工艺，引入梯度晶粒异质结构是克服合金强度-延展性失衡问题的有效途径。

关键词  CoCrNi中熵合金；梯度晶粒异质结构；非均匀变形强化；

中图分类号：TG335.12；TG156.2；TG139；TG115.21⁺5.3     文献标识码：A    doi:10.3969/j.issn.1000-6281.2024.01.009

Design and deformation mechanism of CoCrNi medium entropy alloy with gradient heterostructure

LUO Xian-min¹，SU Hong-hong¹，MAO Sheng-cheng^1*，ZHANG Ze²，HAN Xiao-dong¹

1. Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124；2. School of Materials Science and Engineering, Zhejiang University, Hangzhou Zhejinag, 310027, China)

Abstract   CoCrNi is a typical medium entropy alloy with high plasticity but low tensile strength. The trade-off problem limits its engineering applications. In this work, the heterogeneous structure of the gradient grain and twin was introduced into a CrCoNi medium entropy alloy by rolling annealing and rotating accelerated shot peening. The results show that this design achieves an excellent strong plasticity with the yield strength, tensile strength and fracture plasticity of 665 MPa, 950 MPa and 40.6%, respectively. During tensile deformation, the gradient heterostructure can produce the hetero deformation-induced hardening, improve the yield strength of the alloy, and maintain a high work hardening rate and an excellent ductility. Therefore, the introduction of the gradient heterostructure based on rolling, annealing, and rotating shot peening is an effective way to overcome the trade-off between strength and ductility.

Keywords   CoCrNi medium entropy alloy；gradient heterostructure；hetero-deformation induced hardenging

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[1]    GLUDOVATZ B, HOHENWARTER A, CATOOR D, et al. A fracture-resistant high-entropy alloy for cryogenic applications [J]. Science, 2014, 345(6201): 1153-1158.

[2]    GLUDOVATZ B, HOHENWARTER A, THURSTON K V, et al. Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures [J]. Nature Communications, 2016, 7(1): 10602.

[3]    POLETTI M G, FIORE G, GILI F, et al. Development of a new high entropy alloy for wear resistance: FeCoCrNiW0.3 and FeCoCrNiW0.3+5at.% of C [J]. Materials & Design, 2017, 115: 247-254.

[4]    LUO H, SOHN S S, LU W, et al. A strong and ductile medium-entropy alloy resists hydrogen embrittlement and corrosion [J]. Nature Communications, 2020, 11(1):3081.

[5]    MUANGTONG P, RODCHANAROWAN A, CHAYSUWAN D, et al. The corrosion behaviour of CoCrFeNi-x (x = Cu, Al, Sn) high entropy alloy systems in chloride solution [J]. Corrosion Science, 2020, 172: 108740.

[6]    LU C, NIU L, CHEN N, et al. Enhancing radiation tolerance by controlling defect mobility and migration pathways in multicomponent single-phase alloys [J]. Nature Communications, 2016, 7:13564.

[7]    GRANBERG F, NORDLUND K, ULLAH M W, et al. Mechanism of radiation damage reduction in equiatomic multicomponent single phase alloys [J]. Physical Review Letters, 2016, 116(13): 135504.

[8]    TONG Y, CHEN D, HAN B, et al. Outstanding tensile properties of a precipitation-strengthened FeCoNiCrTi0.2 high-entropy alloy at room and cryogenic temperatures [J]. Acta Materialia, 2019, 165: 228-40.

[9]    KIM D G, JO Y H, YANG J, et al. Ultrastrong duplex high-entropy alloy with 2 GPa cryogenic strength enabled by an accelerated martensitic transformation [J]. Scripta Materialia, 2019, 171: 67-72.

[10]   ZHANG Z, SHENG H, WANG Z, et al. Dislocation mechanisms and 3D twin architectures generate exceptional strength-ductility-toughness combination in CrCoNi medium-entropy alloy [J]. Nature Communications, 2017, 8:14390.

[11]   DIAO H Y, FENG R, DAHMEN K A, et al. Fundamental deformation behavior in high-entropy alloys: An overview [J]. Current Opinion in Solid State and Materials Science, 2017, 21(5): 252-266.

[12]   GAO M C, YEH J-W, LIAW P K, et al. High-entropy alloys [M]. Cham: Springer International Publishing, 2016:16.

[13]   MIRACLE D B, SENKOV O N. A critical review of high entropy alloys and related concepts [J]. Acta Materialia, 2017, 122: 448-511.

[14]   YOSHIDA S, BHATTACHARJEE T, BAI Y, et al. Friction stress and Hall-Petch relationship in CoCrNi equi-atomic medium entropy alloy processed by severe plastic deformation and subsequent annealing [J]. Scripta Materialia, 2017, 134: 33-36.

[15]   LAPLANCHE G, KOSTKA A, REINHART C, et al. Reasons for the superior mechanical properties of medium-entropy CrCoNi compared to high-entropy CrMnFeCoNi [J].  Acta Materialia, 2017, 128: 292-303.

[16]   熊婷, 郑士建, 马秀良. 高熵合金AlCoCrFeNi2.1的共晶组织及析出相研究[J].电子显微学报, 2020, 39(5):470-475.

[17]   LAPLANCHE G, KOSTKA A, REINHART C, et al. Reasons for the superior mechanical properties of medium-entropy CrCoNi compared to high-entropy CrMnFeCoNi [J]. Acta Materialia, 2017, 128: 292-303.

[18]   OKAMOTO N L, FUJIMOTO S, KAMBARA Y, et al.  Size effect, critical resolved shear stress, stacking fault energy, and solid solution strengthening in the CrMnFeCoNi high-entropy alloy [J]. Scientific Reports, 2016, 6(1): 35863.

[19]   符晓倩, 余倩, 张泽.  TWIP高熵合金中塑性变形机理的原位电镜研究[J]. 电子显微学报, 2019, 38(5):452-458.

[20]   陈思静, 余倩. NiCoCr高熵合金中Cr含量对其变形行为影响的原位透射电镜研究[J].电子显微学报, 2020, 39(6):628-634.

[21]   ZHANG F X, ZHAO S, JIN K, et al. Local structure and short-range order in a NiCoCr solid solution alloy [J]. Physical Review Letters, 2017, 118(20): 205501.

[22]   DING J, YU Q, ASTA M, et al. Tunable stacking fault energies by tailoring local chemical order in CrCoNi medium-entropy alloys [J]. Proceedings of the National Academy of Sciences, 2018, 115(36): 8919-8924.

[23]   XU D, WANG M, LI T, et al. A critical review of the mechanical properties of CoCrNi-based medium-entropy alloys [J]. Microstructures, 2022, 2(1): 2022001.

[24]   JUAN C C, TSAI M H, TSAI C W, et al. Simultaneously increasing the strength and ductility of a refractory high-entropy alloy via grain refining [J]. Materials Letters, 2016, 184: 200-203.

[25]   SATHIYAMOORTHI P, BASU J, KASHYAP S, et al. Thermal stability and grain boundary strengthening in ultrafine-grained CoCrFeNi high entropy alloy composite [J]. Materials & Design, 2017, 134: 426-433.

[26]   ZHAO Y L, YANG T, TONG Y, et al. Heterogeneous precipitation behavior and stacking-fault-mediated deformation in a CoCrNi-based medium-entropy alloy [J]. Acta Materialia, 2017, 138: 72-82.

[27]   YUAN F, YAN D, SUN J, et al. Ductility by shear band delocalization in the nano-layer of gradient structure [J]. Materials Research Letters, 2019, 7(1): 12-17.

[28]   ASHBY M. The deformation of plastically non-homogeneous materials [J]. The Philosophical Magazine: A Journal of Theoretical Experimental and Applied Physics, 1970, 21(170): 399-424.

[29]   GAO H, HUANG Y. Geometrically necessary dislocation and size-dependent plasticity [J]. Scripta Materialia, 2003, 48(2): 113-118.

[30]   WU X, YANG M, YUAN F, et al. Heterogeneous lamella structure unites ultrafine-grain strength with coarse-grain ductility [J]. Proceedings of the National Academy of Sciences, 2015, 112(47): 14501-14505.

[31]   LU K. Making strong nanomaterials ductile with gradients [J].  Science, 2014, 345(6203): 1455-1456.

[32]   LU K. Stabilizing nanostructures in metals using grain and twin boundary architectures [J]. Nature Reviews Materials, 2016, 1(5): 16019.

[33]   WU X, ZHU Y. Heterogeneous materials: A new class of materials with unprecedented mechanical properties [J]. Materials Research Letters, 2017, 5(8): 527-532.

[34]   ZHU Y, WU X. Perspective on hetero-deformation induced (HDI) hardening and back stress [J]. Materials Research Letters, 2019, 7(10): 393-398.

[35]   WU X, YANG M, JIANG P, et al. Deformation nanotwins suppress shear banding during impact test of CrCoNi medium-entropy alloy [J]. Scripta Materialia, 2020, 178: 452-456.

[36]   MA E, ZHU T. Towards strength–ductility synergy through the design of heterogeneous nanostructures in metals [J]. Materials Today, 2017, 20(6): 323-331.

[37]   MA E, WU X. Tailoring heterogeneities in high-entropy alloys to promote strength–ductility synergy [J]. Nature Communications, 2019, 10(1): 5623.

[38]   LEE H H, PARK H K, JUNG J, et al. Multi-layered gradient structure manufactured by single-roll angular-rolling and ultrasonic nanocrystalline surface modification [J]. Scripta Materialia, 2020, 186: 52-56.

[39]   WU X, YUAN F, YANG M, et al. Nanodomained nickel unite nanocrystal strength with coarse-grain ductility [J]. Scientific Reports, 2015, 5(1): 11728.

[40]   GUO W, PEI Z, SANG X, et al. Shape-preserving machining produces gradient nanolaminate medium entropy alloys with high strain hardening capability [J]. Acta Materialia, 2019, 170: 176-186.

[41]   MA Y, YUAN F, YANG M, et al. Dynamic shear deformation of a CrCoNi medium-entropy alloy with heterogeneous grain structures [J]. Acta Materialia, 2018, 148: 407-418.

[42]   WANG X, LI Y, ZHANG Q, et al. Gradient structured copper by rotationally accelerated shot peening [J]. Journal of Materials Science & Technology, 2017, 33(7): 758-761.

[43]   DING L, HILHORST A, IDRISSI H, et al. Potential TRIP/TWIP coupled effects in equiatomic CrCoNi medium-entropy alloy [J]. Acta Materialia, 2022, 234: 118049.

[44]   HE J, MAKINENI S K, LU W, et al. On the formation of hierarchical microstructure in a Mo-doped NiCoCr medium-entropy alloy with enhanced strength-ductility synergy [J]. Scripta Materialia, 2020, 175: 1-6.

[45]   YASNIKOV I S, VINOGRADOV A, ESTRIN Y. Revisiting the Considère criterion from the viewpoint of dislocation theory fundamentals [J]. Scripta Materialia, 2014, 76: 37-40.

[46]   胡赓祥，蔡珣，戎咏华. 材料科学基础（第三版）[M]. 上海：上海交通大学出版社, 2010年.

[47]   YANG M, PAN Y, YUAN F, et al. Back stress strengthening and strain hardening in gradient structure [J]. Materials Research Letters, 2016, 4(3): 145-151.

[48]   FANG X, XUE Q, YU K, et al. Superior strength-ductility synergy by hetero-structuring high manganese steel [J]. Materials Research Letters, 2020, 8(11): 417-423.