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中国腐蚀与防护学报  2016, Vol. 36 Issue (2): 107-112    DOI: 10.11902/1005.4537.2016.024
  本期目录 | 过刊浏览 |
几种高熵合金在核电高温高压水中的腐蚀行为研究
向超1,2,王家贞1,付华萌3,韩恩厚1(),张海峰3,王俭秋1,张志明1
1. 中国科学院金属研究所 中国科学院核用材料与安全评价重点实验室 沈阳 110016
2. 东北大学材料与冶金学院 沈阳 110004
3. 中国科学院金属研究所 沈阳材料科学国家 (联合) 实验室 沈阳 110016
Corrosion Behavior of Several High-entropy Alloys in High Temperature High Pressure Water
Chao XIANG1,2,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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摘要: 

通过电弧炉熔炼制备了3种不同成分的高熵合金Co1.5CrFeNi1.5Ti0.5Mo0.1,AlCoCrFeNiSi0.1和TaNbHfZrTi。并通过XRD和SEM等方法对以上几种材料的相结构、微观组织和化学成分进行分析。以核电站中商用690TT合金作为对比材料,采用高温电化学手段研究了这3种高熵合金在高温高压水中的再钝化动力学参数。结果表明,Co1.5CrFeNi1.5Ti0.5Mo0.1,AlCoCrFeNiSi0.1和TaNbHfZrTi 3种合金均由单一相组成,Co1.5CrFeNi1.5Ti0.5Mo0.1为fcc结构,AlCoCrFeNiSi0.1和TaNbHfZrTi为bcc结构。Co1.5CrFeNi1.5Ti0.5Mo0.1合金铸态组织为枝晶结构,枝晶为富Cr和富Fe相,枝晶间相为富Ni和富Ti相。AlCoCrFeNiSi0.1合金的晶粒内部和晶界处存在较小的成分差异。TaNbHfZrTi合金铸态组织为枝晶结构,枝晶为富Ta和富Nb相,枝晶间相为富Hf,富Zr和富Ti相。Co1.5CrFeNi1.5Ti0.5Mo0.1,AlCoCrFeNiSi0.1,TaNbHfZrTi和690TT合金在高温高压水中再钝化速率由快到慢的顺序为：TaNbHfZrTi>Co1.5CrFeNi1.5Ti0.5Mo0.1>690TT>AlCoCrFeNiSi0.1。
关键词 ： 高熵合金,  高温高压水,  腐蚀,  再钝化    
Abstract：

Three high-entropy alloys Co1.5CrFeNi1.5Ti0.5Mo0.1, AlCoCrFeNiSi0.1 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 Co1.5CrFeNi1.5Ti0.5Mo0.1, AlCoCrFeNiSi0.1 and TaNbHfZrTi high entropy alloys are all composed of single phase. The crystallographic structure of Co1.5CrFeNi1.5Ti0.5Mo0.1 alloy is fcc, while that of the alloys AlCoCrFeNiSi0.1 and TaNbHfZrTi is bcc. The SEM results show that the Co1.5CrFeNi1.5Ti0.5Mo0.1 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 AlCoCrFeNiSi0.1 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>Co1.5CrFeNi1.5Ti0.5Mo0.1>690TT>AlCoCrFeNiSi0.1.
Key words： high-entropy alloy    high temperature high pressure water    corrosion    repassivation
    
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向超
王家贞
付华萌
韩恩厚
张海峰
王俭秋
张志明

引用本文:

向超,王家贞,付华萌,韩恩厚,张海峰,王俭秋,张志明. 几种高熵合金在核电高温高压水中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2016, 36(2): 107-112.
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.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2016.024      或      https://www.jcscp.org/CN/Y2016/V36/I2/107

图1  3种高熵合金的XRD谱
图2  Co1.5CrFeNi1.5Ti0.5Mo0.1,AlCoCrFeNiSi0.1和TaNbHfZrTi合金的SEM像
Region Co Cr Fe Ni Ti Mo
Nominal 26.75 18.75 18.75 26.75 8.00 1.00
DR 26.82 19.28 20.46 26.52 5.83 1.09
ID 26.02 10.34 12.77 32.48 17.64 0.75
表1  Co1.5CrFeNi1.5Ti0.5Mo0.1合金化学成分的EDS分析结果
图3  不同材料在300 ℃高温水中的动电位极化曲线
Region Al Co Cr Fe Ni Si
Nominal 19.60 19.60 19.60 19.60 19.60 2.00
A 20.34 19.49 18.54 20.10 19.64 1.90
B 18.44 19.81 20.39 21.66 18.18 1.53
C 16.56 20.36 21.01 21.13 18.21 2.73
表2  AlCoCrFeNiSi0.1高熵合金化学成分的EDS分析结果
图4  不同材料在划伤过程中的暂态电流密度变化曲线
Region Ta Nb Hf Zr Ti
Nominal 20.00 20.00 20.00 20.00 20.00
DR 24.40 18.68 23.40 16.55 16.97
ID 14.94 15.32 24.58 24.38 20.78
表3  TaNbHfZrTi合金化学成分的EDS分析结果
图5  暂态电流密度I的对数与积分电量密度的倒数1/Q的关系曲线
图6  不同材料在300 ℃下的cBV值
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