激光粉末床熔融成形(Fe45Mn35Co10Cr10)99C1高熵合金的显微组织和变形机制

李湘龙; 耿赵文; 陈超; 罗晋如; 周科朝

doi:10.19976/j.cnki.43-1448/TF.2025026

粉末冶金材料科学与工程 >

2025 , Vol. 30 >Issue 5: 395 - 404

DOI: https://doi.org/10.19976/j.cnki.43-1448/TF.2025026

工艺技术

激光粉末床熔融成形(Fe₄₅Mn₃₅Co₁₀Cr₁₀)₉₉C₁高熵合金的显微组织和变形机制

李湘龙 ,
耿赵文 ,
陈超 ,
罗晋如 ,
周科朝

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1.中南大学粉末冶金研究院,长沙 410083;
2.北京科技大学钢铁冶金系,北京 100083

收稿日期: 2025-03-19

修回日期: 2025-09-23

网络出版日期: 2025-11-27

基金资助

国家自然科学基金资助项目(52271046); 湖南省自然科学基金资助项目(2022JJ20061); 湖南省教育厅优秀青年项目(24B0011)

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Microstructure and deformation mechanism of (Fe₄₅Mn₃₅Co₁₀Cr₁₀)₉₉C₁ high-entropy alloy by laser powder bed fusion

LI Xianglong ,
GENG Zhaowen ,
CHEN Chao ,
LUO Jinru ,
ZHOU Kechao

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1. Powder Metallurgy Research Insitute, Central South University, Changsha 410083, China;
2. Department of ?Iron and Steel Metallurgy, University of Science and Technology Beijing, Beijing 100083, China

Received date: 2025-03-19

Revised date: 2025-09-23

Online published: 2025-11-27

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摘要

以气雾化(Fe₄₅Mn₃₅Co₁₀Cr₁₀)₉₉C₁预合金粉末为原料,采用激光粉末床熔融(laser powder bed fusion, LPBF)技术制备FeMnCoCrC高熵合金,通过扫描电子显微镜、透射电子显微镜、X射线衍射仪和室温拉伸测试研究LPBF工艺参数对合金显微组织和力学性能的影响,并揭示合金的变形机制。结果表明：FeMnCoCrC高熵合金具有稳定的单相FCC结构,晶粒取向随机且没有明显的织构,同时LPBF成形过程中,合金形成了丰富的位错胞状结构,未观察到碳化物的析出。在激光功率为120 W、扫描速度为400 mm/s的最优参数下成形的合金,在屈服强度提高的同时保持了良好的伸长率,其屈服强度达到603 MPa,抗拉强度为850 MPa,伸长率为44.0%。FeMnCoCrC高熵合金的塑性变形机制以位错滑移和孪晶诱导塑性变形为主,两者共同提供了稳定的加工硬化能力,变形过程中的马氏体诱导塑性变形机制被完全抑制。

关键词： FeMnCoCr高熵合金; 激光粉末床熔融; 间隙强化; 力学性能; 显微组织

本文引用格式

李湘龙 , 耿赵文 , 陈超 , 罗晋如 , 周科朝 . 激光粉末床熔融成形(Fe₄₅Mn₃₅Co₁₀Cr₁₀)₉₉C₁高熵合金的显微组织和变形机制[J]. 粉末冶金材料科学与工程, 2025 , 30(5) : 395 -404 . DOI: 10.19976/j.cnki.43-1448/TF.2025026

Abstract

FeMnCoCrC high-entropy alloys were fabricated using laser powder bed fusion (LPBF) from pre-alloyed (Fe₄₅Mn₃₅Co₁₀Cr₁₀)₉₉C₁ gas-atomized powder. The effects of LPBF process parameters on the microstructure and mechanical properties of the alloy were investigated by scanning electron microscope, transmission electron microscope, X-ray diffractometer, and room-temperature tensile test, with the aim of elucidating the underlying deformation mechanisms. The results indicate that the FeMnCoCrC high-entropy alloy exhibits a stable single-phase FCC structure, with randomly oriented grains and no significant texture. Furthermore, rich dislocation cell structures formed during the LPBF process, while no carbide precipitation is observed. The alloy fabricated under the optimal parameters (laser power of 120 W and scanning speed of 400 mm/s) demonstrates a enhanced yield strength while maintaining good elongation, achieving a yield strength of 603 MPa, a tensile strength of 850 MPa, and an elongation of 44.0%. The plastic deformation mechanism of the FeMnCoCrC high-entropy alloy is primarily governed by dislocation slip and twinning-induced plasticity, which collectively contribute to a sustained work-hardening capacity. In contrast, the martensite-induced plasticity mechanism is completely suppressed during deformation.

Key words： FeMnCoCr high-entropy alloy; laser powder bed fusion; interstitial strengthening; mechanical property; microstructure

参考文献

[1] 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(7606): 227-230.
[2] LI Z M, TASAN C C, SPRINGER H, et al.Interstitial atoms enable joint twinning and transformation induced plasticity in strong and ductile high-entropy alloys[J]. Scientific Reports, 2017, 7: 40704.
[3] RITCHIE R O.The conflicts between strength and toughness[J]. Nature Materials, 2011, 10(11): 817-822.
[4] YANG F, DONG L M, CAI L, et al.Mechanical properties of FeMnCoCr high entropy alloy alloyed with C/Si at low temperatures[J]. Journal of Alloys and Compounds, 2021, 859: 157876.
[5] FU Z H, WU P F, ZHU S Y, et al.Effects of interstitial C and N on hydrogen embrittlement behavior of non-equiatomic metastable FeMnCoCr high-entropy alloys[J]. Corrosion Science, 2022, 194: 109933.
[6] SU Z X, SHI T, YANG J X, et al.The effect of interstitial carbon atoms on defect evolution in high entropy alloys under helium irradiation[J]. Acta Materialia, 2022, 233: 117955.
[7] 杨紫微, 陈超, 吴谊友, 等. 选区激光熔化成形Al-Ce-Sc-Zr合金的工艺优化与组织性能[J]. 粉末冶金材料科学与工程, 2023, 28(2): 170-179.
YANG Ziwei, CHEN Chao, WU Yiyou, et al.Process optimization, microstructure and mechanical properties of Al-Ce-Sc-Zr alloy by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2023, 28(2): 170-179.
[8] 艾永康, 刘祖铭, 张亚洲, 等. 选区激光熔融制备Cu-Cr-Nb-Ce合金组织与性能的高温稳定性[J]. 粉末冶金材料科学与工程, 2022, 27(5): 478-487.
AI Yongkang, LIU Zuming, ZHANG Yazhou, et al.High-temperature stability of microstructure and properties of Cu-Cr-Nb-Ce alloy fabricated by selective laser melting[J]. Materials Science and Engineering of Powder Metallurgy, 2022, 27(5): 478-487.
[9] LI R D, NIU P D, YUAN T C, et al.Displacive transformation as pathway to prevent micro-cracks induced by thermal stress in additively manufactured strong and ductile high-entropy alloys[J]. Transactions of Nonferrous Metals Society of China, 2021, 31(4): 1059-1073.
[10] ZHANG W, SHEN J J, OLIVEIRA J P, et al.Deformation processes of additively manufactured interstitial- strengthened high entropy alloy: in-situ high-energy synchrotron X-ray diffraction and microstructural appraisal[J]. Additive Manufacturing, 2023, 76: 103791.
[11] ZHANG W Y, YAN D S, LU W J, et al.Carbon and nitrogen co-doping enhances phase stability and mechanical properties of a metastable high-entropy alloy[J]. Journal of Alloys and Compounds, 2020, 831: 154799.
[12] CHEN L B, WEI R, TANG K, et al.Heavy carbon alloyed FCC-structured high entropy alloy with excellent combination of strength and ductility[J]. Materials Science and Engineering A, 2018, 716: 150-156.
[13] HE M Y, SHEN Y F, JIA N, et al.C and N doping in high-entropy alloys: a pathway to achieve desired strength- ductility synergy[J]. Applied Materials Today, 2021, 25: 101162.
[14] LIU X L, ZHAO X R, CHEN J, et al.Effect of C addition on microstructure and mechanical properties of as-cast HEAs (Fe₅₀Mn₃₀Co₁₀Cr₁₀)₁₀₀-_xC_x[J]. Materials Chemistry and Physics, 2020, 254: 123501.
[15] GUO Z H, JING S R, YU M H, et al.Effects of rolling at different temperatures and subsequent recovery annealing on the mechanical properties of a metastable carbon containing FeMnCoCr high-entropy alloy[J]. Materials Characterization, 2024, 217: 114328.
[16] CHABOK A, ZHANG W, SHEN J J, et al.On the orientation-dependent mechanical properties of interstitial solute-strengthened Fe_49.5Mn₃₀Co₁₀Cr₁₀C_0.5 high entropy alloy produced by directed energy deposition[J]. Additive Manufacturing, 2024, 79: 103914.
[17] GALY C, LE GUEN E, LACOSTE E, et al.Main defects observed in aluminum alloy parts produced by SLM: from causes to consequences[J]. Additive Manufacturing, 2018, 22: 165-175.
[18] WEI K W, ZENG X Y, HUANG G, et al.Selective laser melting of Ti-5Al-2.5Sn alloy with isotropic tensile properties: the combined effect of densification state, microstructural morphology, and crystallographic orientation characteristics[J]. Journal of Materials Processing Technology, 2019, 271: 368-376.
[19] WEI S L, KIM J, TASAN C C.Boundary micro-cracking in metastable Fe₄₅Mn₃₅Co₁₀Cr₁₀ high-entropy alloys[J]. Acta Materialia, 2019, 168: 76-86.
[20] DEBROY T, WEI H L, ZUBACK J S, et al.Additive manufacturing of metallic components: process, structure and properties[J]. Progress in Materials Science, 2018, 92: 112-224.
[21] SAEED-AKBARI A, IMLAU J, PRAHL U, et al.Derivation and variation in composition-dependent stacking fault energy maps based on subregular solution model in high-manganese steels[J]. Metallurgical and Materials Transactions A, 2009, 40(13): 3076-3090.
[22] ZHU Z G, AN X H, LU W J, et al.Selective laser melting enabling the hierarchically heterogeneous microstructure and excellent mechanical properties in an interstitial solute strengthened high entropy alloy[J]. Materials Research Letters, 2019, 7(11): 453-459.
[23] LIU L F, DING Q Q, ZHONG Y, et al.Dislocation network in additive manufactured steel breaks strength-ductility trade-off[J]. Materials Today, 2018, 21(4): 354-361.
[24] WANG Y M, VOISIN T, MCKEOWN J T, et al.Additively manufactured hierarchical stainless steels with high strength and ductility[J]. Nature Materials, 2018, 17(1): 63-71.
[25] SINGH P, PICAK S, SHARMA A, et al.Martensitic transformation in Fe??Mn₈₀-??Co₁₀Cr₁₀ high-entropy alloy[J]. Physical Review Letters, 2021, 127(11): 115704.
[26] YANG Z B, LU S, TIAN Y Z, et al.Theoretical and experimental study of phase transformation and twinning behavior in metastable high-entropy alloys[J]. Journal of Materials Science & Technology, 2022, 99: 161-168.
[27] GAN K F, YAN D S, ZHU S Y, et al.Interstitial effects on the incipient plasticity and dislocation behavior of a metastable high-entropy alloy: nanoindentation experiments and statistical modeling[J]. Acta Materialia, 2021, 206: 116633.
[28] SCHNEIDER M, LAPLANCHE G.Effects of temperature on mechanical properties and deformation mechanisms of the equiatomic CrFeNi medium-entropy alloy[J]. Acta Materialia, 2021, 204: 116470.
[29] ZHANG W, WANG H, KOOI B J, et al.Additive manufacturing of interstitial-strengthened high entropy alloy: scanning strategy dependent anisotropic mechanical properties[J]. Materials Science and Engineering A, 2023, 872: 144978.

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