Effects of Cr replacing Fe on microstructure and properties of AlCoCrFeNi2.1 eutectic high entropy alloy

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t Pub Date : 2025-09-17 DOI:10.1016/j.jmrt.2025.09.153

Jingmin Duan, Saiyang Luo, Chenglin Hou, Yong Dong, Lingbo Mao

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引用次数: 0

Abstract

The AlCoCr_xFe_2-xNi_2.1 (x = 1.1, 1.2, 1.3, 1.4 and 1.5) eutectic high-entropy alloys (EHEAs) were designed and its microstructure, mechanical and corrosion properties were studied. The alloys exhibited uniform face-centered cube (FCC)/ordered body-centered cube (B2) dual-phases eutectic structure. The volume percentage of B2 phases increased from 44 % to 50 % with the increase of Cr contents. A large number of Cr-enriched bcc-structured nanoparticles formed in B2 phases. In addition, the compressive yield strength increases linearly from 672 MPa to 810 MPa while the fracture strength increases from 2385 MPa to 2667 MPa. The electrochemical experiment results showed that the corrosion resistance of the AlCoCr_xFe_2-xNi_2.1 alloys increased first and then decreased when the values of x increased from 1.1 to 1.5. Among the alloys, the AlCoCr₁_·₂Fe₀_·₈Ni_2.1 alloy had the most outstanding corrosion resistance performance with the values of corrosion current density (I_corr) 1.06 μA/cm², passivation current density (I_pass) 3.70 μA/cm², pitting potential (E_pit) 457 mV_SCE, corrosion potential (E_corr) −365 mV_SCE, and polarization resistance (R_p) 410.10 kΩ cm², respectively.

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Cr取代Fe对AlCoCrFeNi2.1共晶高熵合金组织和性能的影响

设计了AlCoCrxFe2-xNi2.1 （x = 1.1, 1.2, 1.3, 1.4和1.5）共晶高熵合金（EHEAs），研究了其显微组织、力学性能和腐蚀性能。合金表现出均匀的面心立方(FCC)/有序的体心立方（B2）双相共晶结构。随着Cr含量的增加，B2相的体积百分比从44%增加到50%。在B2相中形成了大量富cr的bcc结构纳米颗粒。抗压屈服强度从672 MPa增加到810 MPa，断裂强度从2385 MPa增加到2667 MPa。电化学实验结果表明，当x值从1.1增大到1.5时，AlCoCrxFe2-xNi2.1合金的耐蚀性先增大后减小。其中，AlCoCr1·2Fe0·8Ni2.1合金的耐蚀性能最为突出，腐蚀电流密度（Icorr）为1.06 μA/cm2，钝化电流密度（Ipass）为3.70 μA/cm2，点蚀电位（Epit）为457 mVSCE，腐蚀电位（Ecorr）为−365 mVSCE，极化电阻（Rp）为410.10 kΩ cm2。

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来源期刊

Journal of Materials Research and Technology-Jmr&t Materials Science-Metals and Alloys

CiteScore

8.80

自引率

9.40%

发文量

1877

审稿时长

35 days

期刊介绍： The Journal of Materials Research and Technology is a publication of ABM - Brazilian Metallurgical, Materials and Mining Association - and publishes four issues per year also with a free version online (www.jmrt.com.br). The journal provides an international medium for the publication of theoretical and experimental studies related to Metallurgy, Materials and Minerals research and technology. Appropriate submissions to the Journal of Materials Research and Technology should include scientific and/or engineering factors which affect processes and products in the Metallurgy, Materials and Mining areas.