Corrosion Behavior in Different Media and Mechanical Properties of Al0.5CoCrFeNi High-entropy Alloy After Heat Treatment

doi:10.11902/1005.4537.2024.294

Journal of Chinese Society for Corrosion and protection

2025, Vol. 45

Issue (4): 983-994 DOI: 10.11902/1005.4537.2024.294

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Corrosion Behavior in Different Media and Mechanical Properties of Al_0.5CoCrFeNi High-entropy Alloy After Heat Treatment

DUAN Jingmin, DONG Yong(

), MIAO Dongmei, YANG Yujing, MAO Lingbo, ZHANG Zhengrong

School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006, China

Cite this article:

DUAN Jingmin, DONG Yong, MIAO Dongmei, YANG Yujing, MAO Lingbo, ZHANG Zhengrong. Corrosion Behavior in Different Media and Mechanical Properties of Al_0.5CoCrFeNi High-entropy Alloy After Heat Treatment. Journal of Chinese Society for Corrosion and protection, 2025, 45(4): 983-994.

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Abstract

The Al_0.5CoCrFeNi high-entropy alloy was smelted by vacuum medium frequency induction melting, followed by homogenization heat-treatment and cold rolling with 40% reduction, and then post-heat treatment at 800, 1000 and 1200 ℃ respectively. The microstructure and mechanical properties, as well as the corrosion behavior in solutions of 0.5 mol/L H₂SO₄, 0.5 mol/L NaOH and 3.5%NaCl of as the cast alloy and the rolled + post heat-treated alloys were studied by XRD, SEM, EDS, AFM, universal testing machine and electrochemical corrosion test. The microstructure analysis shows that the as-cast high entropy alloy has a typical dendrite structure composed of fcc-phase and bcc-phase (B2) with precipitates of flocculent structure-like fine fcc-phase within the B2-phase, however after rolling+heat treatment, the fine fcc-phase within the B2 phase is completely dissolved, while certain amount of acicular B2-phase is precipitated within the fcc-phase. Mechanical analysis shows that the precipitation of the hard and brittle acicular B2-phase increases the yield strength and hardness of the alloy. After rolling + heat treatment, the potential difference within the B2 phase is eliminated, but the potential difference between B2-phase and fcc-phase is increased, nevertheless, which gradually decreases with the increase of heat treatment temperature. The electrochemical corrosion test results show that in 0.5 mol/L H₂SO₄ solution, the corrosion properties of the alloy at different temperatures are linearly related to the Cr content in B2-phase. In 0.5 mol/L NaOH solution, the as-cast alloy and rolled + 1000 ℃ heat treated alloy showed excellent corrosion resistance. In contrast, the rolled + 1200 ℃ heat treated alloy has the best corrosion resistance in 3.5%NaCl solution.

Key words: high-entropy alloy flocculent fcc phase needle-like B2 phase corrosion behavior

Received: 11 September 2024 32134.14.1005.4537.2024.294

ZTFLH:

TG174

Fund: National Natural Science Foundation of China(51801029);Natural Science Foundation of Guangdong Province(2022A0505050052);Natural Science Foundation of Guangdong Province(2022A1515012591)

Corresponding Authors: DONG Yong, E-mail: dongyong5205@163.com

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	DUAN Jingmin
	DONG Yong
	MIAO Dongmei
	YANG Yujing
	MAO Lingbo
	ZHANG Zhengrong

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https://www.jcscp.org/EN/10.11902/1005.4537.2024.294 OR https://www.jcscp.org/EN/Y2025/V45/I4/983

Fig.1 Dimensions of tensile specimen (unit: mm)

Fig.2 XRD patterns (a) and volume fractions of fcc and bcc (B2) phases (b) for as-cast alloy and as-rolled alloys with heat treatment at different temperatures

Fig.3 BSE images and EDS element mappings of as-cast alloy (a1, a2) and as-rolled alloys with heat treatment at 800 ℃ (b1, b2), 1000 ℃ (c1, c2) and 1200 ℃ (d1, d2)

Table 1 EDS determined chemical compositions of the marked regions in Fig.3 for as-cast alloy and as-rolled alloys with heat treatment at different temperatures

Fig.4 Tensile curves (a) and hardness values (b) of as-cast alloy and as-rolled alloys with heat treatment at different temperatures

Table 2 Mechanical properties of as-cast alloy and as-rolled alloys with heat treatment at different temperatures

Fig.5 Tensile fracture morphologies of as-cast alloy (a1, a2) and as-rolled alloys with heat treatment at 800 ℃ (b1, b2), 1000 ℃ (c1, c2) and 1200 ℃ (d1, d2)

Fig.6 SKPFM morphologies (a1, b1) and Volta potential diagrams (a2, b2) of as-cast alloy: (a1) overall view, (b1) B2 phase

Fig.7 SKPFM morphologies (a1-c1) and Volta potential diagrams (a2-c2) of as-rolled alloys with heat treatment at 800 ℃ (a1, a1), 1000 ℃ (b1, b2) and 1200 ℃ (c1, c2)

Fig.8 Potentiodynamic polarization curves of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 0.5 mol/L H₂SO₄ solution

Table 3 Fitting electrochemical parameters of polarization curves and EIS of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 0.5 mol/L H₂SO₄ solution

Fig.9 Nyquist (a) and Bode (b) plots of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 0.5 mol/L H₂SO₄ solution

Fig.10 Equivalent circuit model for fitting EIS data of alloys in 0.5 mol/L H₂SO₄ solution

Fig.11 SEM images of as-cast alloy (a) and as-rolled alloys with heat treatment at 800 ℃ (b), 1000 ℃ (c) and 1200 ℃ (d) after corrosion in 0.5 mol/L H₂SO₄ solution

Fig.12 Potentiodynamic polarization curves of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 0.5 mol/L NaOH solution

Table 4 Fitting parameters of polarization curves and EIS of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 0.5 mol/L NaOH solution

Fig.13 Nyquist (a) and Bode (b) plots of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 0.5 mol/L NaOH solution

Fig.14 SEM images of as-cast alloy (a) and as-rolled alloys with heat treatment at 800 ℃ (b), 1000 ℃ (c) and 1200 ℃ (d) in 0.5 mol/L NaOH solution

Fig.15 Potentiodynamic polarization curves of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 3.5%NaCl solution

Table 5 Fitting parameters of potentiodynamic polarization curves of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 3.5%NaCl solution

Fig.16 EIS curves of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 3.5% NaCl solution: (a) Nyquist plots, (b) Bode plots

Fig.17 Equivalent circuit for fitting EIS data of alloys in 3.5%NaCl solution

Table 6 Fitting parameters of EIS of as-cast alloy and as-rolled alloys with heat treatment at different temperatures in 3.5%NaCl solution

Fig.18 SEM images of as-cast alloy (a) and as-rolled alloys with heat treatment at 800 ℃ (b), 1000 ℃ (c) and 1200 ℃ (d) after corrosion in 3.5%NaCl solution

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