Corrosion Behavior of Several High-entropy Alloys in High Temperature High Pressure Water

doi:10.11902/1005.4537.2016.024

Journal of Chinese Society for Corrosion and protection

2016, Vol. 36

Issue (2): 107-112 DOI: 10.11902/1005.4537.2016.024

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Corrosion Behavior of Several High-entropy Alloys in High Temperature High Pressure Water

Chao XIANG^1,²,Jiazhen WANG¹,Huameng FU³,En-Hou HAN¹(

),Haifeng ZHANG³,Jianqiu WANG¹,Zhiming ZHANG¹

1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials and Metallurgy, Northeastern University, Shenyang 110004, China
3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

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Abstract

Three high-entropy alloys Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1, AlCoCrFeNiSi_0.1 and TaNbHfZrTi were prepared by arc melting. Their phase structure, microstructure and chemical composition were studied by means of X-ray diffraction (XRD) and scanning electron microscopy (SEM). A commercial alloy 690TT was used as the contrast material. The repassivation kinetics of the three high entropy alloys in high temperature pressurized water was investigated by means of electrochemical test. The results show that Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1, AlCoCrFeNiSi_0.1 and TaNbHfZrTi high entropy alloys are all composed of single phase. The crystallographic structure of Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1 alloy is fcc, while that of the alloys AlCoCrFeNiSi_0.1 and TaNbHfZrTi is bcc. The SEM results show that the Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1 alloy showed a typical dendritic microstructure, of which the dendrite riches in Cr and Fe, but the interdendrite zone riches in Ti and Ni. There is no obvious element segregation observed in the AlCoCrFeNiSi_0.1 alloy. The TaNbHfZrTi alloy also exhibited a dendritic microstucture, of which the dendrite riches in Ta and Nb, and the interdendrite zone riches in Hf, Zr and Ti. The repassivation rates of these four alloys in high-temperature pressurized water may be ranked as the following sequence: TaNbHfZrTi>Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1>690TT>AlCoCrFeNiSi_0.1.

Key words: high-entropy alloy high temperature high pressure water corrosion repassivation

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	Chao XIANG
	Jiazhen WANG
	Huameng FU
	En-Hou HAN
	Haifeng ZHANG
	Jianqiu WANG
	Zhiming ZHANG

Cite this article:

Chao XIANG,Jiazhen WANG,Huameng FU,En-Hou HAN,Haifeng ZHANG,Jianqiu WANG,Zhiming ZHANG. Corrosion Behavior of Several High-entropy Alloys in High Temperature High Pressure Water. Journal of Chinese Society for Corrosion and protection, 2016, 36(2): 107-112.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.024 OR https://www.jcscp.org/EN/Y2016/V36/I2/107

Fig.1 XRD patterns of Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1 (a),AlCoCrFeNiSi_0.1 (b) and TaNbHfZrTi (c)alloys

Fig.2 SEM images of Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1 (a), AlCoCrFeNiSi_0.1 (b) and TaNbHfZrTi (c) alloys

Table 1 Chemical compositions of Co_1.5CrFeNi_1.5Ti_0.5Mo_0.1alloy by EDS analysis (atomic fraction / %)

Fig.3 Potentiodynamic polarization curves for different materials in high temperature water at 300 ℃ (DO=100 μg/kg, scan rate=0.5 mV/s)

Table 2 Chemical compositions of AlCoCrFeNiSi_0.1 alloy by EDS analysis (atomic fraction / %)

Fig.4 Variations of transient current density of different materials during the scratching test in high temperature water with DO=100 μg/kg at 300 ℃

Table 3 Chemical compositions of TaNbHfZrTi alloy by EDS analysis (atomic fraction / %)

Fig.5 Curves of transient current density I vs the reciprocal of charged density 1/Q for different materials in high temperature water with DO=100 μg/kg at 300 ℃

Fig.6 cBV values of different materials in high temperature water with DO=100 μg/kg at 300 ℃

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