退火对室温与液氮温度轧制后CrCoNi中熵合金组织与力学性能影响

陈今良; 金学元; 易健宏

doi:10.7513/j.issn.1004-7638.2025.03.023

退火对室温与液氮温度轧制后CrCoNi中熵合金组织与力学性能影响

doi: 10.7513/j.issn.1004-7638.2025.03.023

1.
攀枝花学院钒钛学院, 四川攀枝花 617000
2.
攀枝花学院公共实验教学中心, 四川攀枝花 617000
3.
昆明理工大学材料科学与工程学院, 云南昆明 650093

基金项目: 攀枝花市科技项目（2022ZD-G-14）。

详细信息

作者简介:
陈今良，1983年出生，男，湖南隆回人，博士，主要从事高熵合金材料研究，E-mail：chenjinliang@126.com

中图分类号: TF76, TG174.4
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出版历程
- 收稿日期: 2024-04-12
- 网络出版日期: 2025-06-30
- 刊出日期: 2025-06-30

Effect of annealing on microstructure and mechanical properties of CrCoNi medium entropy alloy rolled at room temperature and liquid nitrogen temperature

1.
Institute of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, Sichuan, China
2.
Public Experimental Teaching Center, Panzhihua University, Panzhihua 617000, Sichuan, China
3.
School of Materials Science and Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan, China

摘要

摘要: 将铸态CrCoNi中熵合金分别在室温与液氮温度下轧制变形，随后分别采用中低温短时间退火工艺处理，对比室温轧制+退火、液氮温度轧制+退火对合金强塑性改善差异。结果表明：当退火参数为700 ℃/30 min时，两种轧制条件下合金的屈服强度均远高于1000 MPa，且LNTR-700 ℃试样的断裂延伸率维持在26.2%，远高于现有文献报道中同等参数退火态的强度和塑性值；当退火参数为800 ℃/30 min时，RTR-800 ℃合金的抗拉强度为987 MPa，断裂延伸率为37.2%，而LNTR-800 ℃试样的抗拉强度为947 MPa，断裂延伸率达到58%。即相比于室温轧制+退火，采用液氮温度轧制+退火工艺，对CrCoNi中熵合金的强塑性改善更为显著，原因是液氮温度轧制+退火后晶粒更为细小，形成更为明显的异质晶粒结构。
- CrCoNi中熵合金 /
- 室温轧制 /
- 液氮温度轧制 /
- 中低温退火 /
- 组织与性能
Abstract: The as-casted CrCoNi medium entropy alloy was rolled at room temperature and liquid nitrogen temperature, respectively, and then annealed at medium and low temperatures in short period respectively. The difference of strength and improvement of the alloy under room temperature rolling + annealing and liquid nitrogen temperature rolling + annealing conditions was studied. The experimental results show that when the annealing parameter is 700 ℃/30 min, the yield strengths of studied alloy under both two rolling conditions are much higher than 1000 MPa, and the fracture elongation of LNTR-700℃ sample is 26.2%, which is much higher than the reported values of strength and elongation for same alloy under same annealing conditions. When the annealing parameter is 800 ℃/30 min, the yield strength of RTR-800℃ alloy is 987 MPa and the fracture elongation is 37.2%, while the yield strength of LNTR-800℃ sample is 947 MPa and the fracture elongation is 58%. In other words, compared with room temperature rolling + annealing, liquid nitrogen temperature rolling + annealing process can significantly improve the strength and ductility of CrCoNi medium entropy, which is attributed to the finer grains, higher recrystallization degree and lower dislocation density benefited from liquid nitrogen temperature rolling + annealing process.
- CrCoNi medium entropy alloy /
- room temperature rolling /
- liquid nitrogen temperature rolling /
- medium and low temperature annealing /
- structure and properties

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图 1 RTR、LNTR试样相应退火后CrCoNi中熵合金XRD谱

（a）RTR及相应退火态；（b）LNTR及相应退火态

Figure 1. XRD patterns of CrCoNi alloy after corresponding annealing of RTR and LNTR samples

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图 2 室温与液氮温度轧制及相应退火态金相组织

（a）室温轧制态；（b）液氮温度轧制态；（c）（d）650 ℃/30 min退火；（e）（f）700 ℃/30 min退火；（g）（h）800 ℃/30 min退火

Figure 2. Microstructure of annealed alloys after rolling at room temperature and liquid nitrogen temperature

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图 3 CrCoNi中熵合金在800 ℃退火后晶粒取向分布

Figure 3. Grain orientation distribution of CrCoNi alloy after annealing at 800 ℃

（a）RTR-800 ℃；（b）LNTR-800 ℃

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图 4 CrCoNi中熵合金在800 ℃退火后再结晶晶粒分布与比例

（a）RTR-800 ℃试样；（b）LNTR-800 ℃试样；（c）再结晶比例

Figure 4. Recrystallization grain distribution and ratio of CrCoNi alloy after annealing at 800 ℃

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图 5 CrCoNi中熵合金在800 ℃退火后GND位错分布KAM图

Figure 5. KAM map of GND dislocation distribution of CrCoNi alloy after annealing at 800 ℃

（a）RTR-800 ℃；（b）LNTR-800 ℃

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图 6 CrCoNi中熵合金退火后工程应力应变曲线

（a）室温轧制后；（b）液氮温度轧制后

Figure 6. Engineering stress-strain curves of CrCoNi alloy rolling annealing

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图 7 CrCoNi中熵合金退火后真实应力应变曲线及加工硬化率曲线

（a）室温轧制后；（b）液氮温度轧制后

Figure 7. True stress-strain curve and work-hardening rate curves of CrCoNi alloy annealing

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图 8 CrCoNi中熵合金退火后断口形貌

Figure 8. Fracture morphology of CrCoNi alloy after annealing

(a) RTR-650 ℃；(b) LNTR-650 ℃；(c) RTR-700 ℃；(d) LNTR-700 ℃；(e) RTR-800 ℃；(f) LNTR-800 ℃

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参考文献(17)

[1]	YEH J, CHEN S, LIN S. Nanostructured high-entropy alloys with multiple principal elements: Novel alloy design concepts and outcomes[J]. Advanced Engineering Materials, 2004,6:299-303. doi: 10.1002/adem.200300567
[2]	CANTOR B, CHANG I T H, KNIGHT P. Microstructural development in equiatomic multicomponent alloys[J]. Materials Science and Engineering A, 2004,375:213-218.
[3]	HSU Y J, CHIANG W C, WU J K. Corrosion behavior of FeCoNiCrCu_x high-entropy alloys in 3.5% sodium chloride solution[J]. Materials Chemistry and Physics, 2005,92(1):112-117. doi: 10.1016/j.matchemphys.2005.01.001
[4]	ZHANG W, LIAW P K, ZHANG Y. Science and technology in high-entropy alloys[J]. Science China Materials, 2018,61(1):2-22. doi: 10.1007/s40843-017-9195-8
[5]	GAO M C, YEH J W, LIAW P K, et al. High-entropy alloys[J]. Cham: Springer International Publishing, 2016.
[6]	ZHANG Y. High-entropy materials[J]. Springer Nature Singapore Pte Ltd, 2019,2:215-232.
[7]	MIAHRA R S, HARIDAS R S, AGRAWAL P. High entropy alloys – tunability of deformation mechanisms through integration of compositional and microstructural domains[J]. Materials Science and Engineering: A, 2021,812:141085. doi: 10.1016/j.msea.2021.141085
[8]	ZHANG Y, ZUO T T, TANG Z, et al. Microstructures and properties of high-entropy alloys[J]. Progress in Materials Science, 2014,61:1-93. doi: 10.1016/j.pmatsci.2013.10.001
[9]	YEH J. Alloy design strategies and future trends in high-entropy alloys[J]. JOM, 2013,65(12):1759-1771. doi: 10.1007/s11837-013-0761-6
[10]	TSAI K Y, TSAI M H, YEH J W. Sluggish diffusion in Co–Cr–Fe–Mn–Ni high-entropy alloys[J]. Acta Materialia, 2013,61(13):4887-4897. doi: 10.1016/j.actamat.2013.04.058
[11]	SLONE C E, MIAO J, GEORGE E P, et al. Achieving ultra-high strength and ductility in equiatomic CrCoNi with partially recrystallized microstructures[J]. Acta Materialia, 2019,165:496-507. doi: 10.1016/j.actamat.2018.12.015
[12]	WU Z, BEI H, PHARR G M, et al. Temperature dependence of the mechanical properties of equiatomic solid solution alloys with face-centered cubic crystal structures[J]. Acta Materialia, 2014, 81: 428.
[13]	SONG Li Y, WANG Y F, WANG M S, et al. Microstructure and mechanical behavior of CrCoNi medium entropy alloys in 1000 MPa grade[J]. Joural of Aeronautical Materials, 2020,40(4):62-70. (宋凌云, 王艳飞, 王明赛, 等. 1000 MPa级CrCoNi中熵合金的微观组织和力学行为[J]. 航空材料学报, 2020,40(4):62-70. SONG Li Y, WANG Y F, WANG M S, et al. Microstructure and mechanical behavior of CrCoNi medium entropy alloys in 1000 MPa grade[J]. Joural of Aeronautical Materials, 2020, 40（4）: 62-70.
[14]	PRAVEEN S, BAE J W, ASGHARI Rad P, et al. Ultra-high tensile strength nanocrystalline CoCrNi equiatomic medium entropy alloy processed by high-pressure torsion[J]. Materials Science and Engineering: A, 2018,735:394-397. doi: 10.1016/j.msea.2018.08.079
[15]	SCHNEIDER M, GEORGE E P, MANESCAU T J, et al. Analysis of strengthening due to grain boundaries and annealing twin boundaries in the CrCoNi medium-entropy alloy[J]. International Journal of Plasticity, 2020,124:155-169. doi: 10.1016/j.ijplas.2019.08.009
[16]	LIANG Y, YANG X, MING K. et al. In situ observation of transmission and reflection of dislocations at twin boundary in CoCrNi alloys[J]. Science China Technological Sciences volume, 2021,64:407-413. doi: 10.1007/s11431-019-1517-8
[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. doi: 10.1016/j.actamat.2017.02.036