摘要
制备了Fe_(34)Cr_(30)Mo_(15)Ni_(15)Nb_(3)Al_(3)高熵合金,铸态组织包含FCC相、Laves相和B2-NiAl相。随后将高熵合金置于500℃、氧浓度为10-6%(质量分数)的液态铅铋合金中进行1000~2000 h的静态腐蚀实验。结果表明:高熵合金未发生明显的元素溶解、铅铋渗透和相变。静态腐蚀1000~2000 h后,Laves相区域表面只生成了Fe-Cr尖晶石。但腐蚀1000 h后,FCC/B2-NiAl相区域表面除了内层生成了Fe-Cr尖晶石,外层还生成了贫Cr的FeCr尖晶石;随着腐蚀时间增加到1500 h,FCC/B2-NiAl相区域外层贫Cr的Fe-Cr尖晶石发生脱落;腐蚀2000 h后,Fe3O4开始生成,覆盖FCC/B2-NiAl相区域外表面。高熵合金表面的氧化层均较薄,厚度不超过3μm,表现出较好的耐腐蚀性。高熵合金具有良好耐腐蚀的原因是由于Laves相分布均匀,抑制了金属元素的向外扩散。
In this paper,a high-entropy alloy Fe_(34)Cr_(30)Mo_(15)Ni_(15)Nb_(3)Al_(3) was prepared via vacuum induction melting technique.The cast alloy consists of FCC phase,Laves phase and B2-NiAl phase.Then,the high-entropy alloy was subjected to corrosion test at 500℃ in static molten Pb-Bi eutectic(MBE)containing 10-6%oxygen(in mass fraction)for 1000,1500 and 2000 h,respectively.The results showed that after corrosion test,the high entropy alloy did not show obvious signs of being attacked by molten Pb-Bi eutectic,namely,there was no obvious dissolution of alloy components and phase transformation,and no obvious inward permeation of Pb and Bi from MBE into the alloy.Only a continuous Fe-Cr spinel scale was formed on the Laves phase region after static corrosion from 1000 h to 2000 h.It is worth mentioning in particular that after exposure for 1000 h,both of Fe-Cr spinel and Cr-depleted Fe-Cr spinel was formed on the surface of FCC/B2-NiAl phase region.As the corrosion time increased to 1500 h,the outer scale of Cr-depleted Fe-Cr spinel formed on the FCC/B2-NiAl phase region spalled off.After exposure for 2000 h,Fe3O4 was generated above the Fe-Cr spinel scale,and covered the entire surface of FCC/B2-NiAl phase region.In conclusion,the oxide scales formed on the high-entropy alloy are very thin and compact,with a maximum thickness less than 3µm,so that the high-entropy alloy presented good resistance to MBE corrosion.The outstanding corrosion resistance of high-entropy alloy may be attributed to the homogeneous distribution of Laves phase,which effectively suppresses the outward diffusion of components of the high-entropy alloy.
作者
潘宗宇
刘静
姜志忠
罗林
贾寒冰
刘欣雨
PAN Zongyu;LIU Jing;JIANG Zhizhong;LUO Lin;JIA Hanbing;LIU Xinyu(Institutes of Physical Science and Information Technology,Anhui University,Hefei 230601,China;Institute of Nuclear Energy Safety Technology,Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China;University of Science and Technology of China,Hefei 230026,China)
出处
《中国腐蚀与防护学报》
CAS
CSCD
北大核心
2024年第5期1353-1360,共8页
Journal of Chinese Society For Corrosion and Protection
基金
国家重点研发计划(2022YFB1902502)
中国科学院合肥大科学中心重点研发项目(2022HSC-CIP028)
中国科学院合肥物质科学研究院院长基金(YZJJ2022QN39)。
