首页|Fe34Cr30Mo15Ni15Nb3Al3高熵合金在500℃下氧含量为10-6%的液态铅铋合金中腐蚀行为研究

Fe34Cr30Mo15Ni15Nb3Al3高熵合金在500℃下氧含量为10-6%的液态铅铋合金中腐蚀行为研究

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制备了 Fe34Cr30Mo15Ni15Nb3Al,高熵合金,铸态组织包含FCC相、Laves相和B2-NiA1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Fe-Cr尖晶石;随着腐蚀时间增加到1500h,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3 μm,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.
Corrosion Behavior of Fe34Cr30Mo15Ni15Nb3Al3 High-entropy Alloy in Molten Pb-Bi Eutectic Containing 10-6%Oxygen at 500℃
In this paper,a high-entropy alloy Fe34Cr30Mo15Ni15Nb3Al3 was prepared via vacuum induc-tion 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)contain-ing 10-6%oxygen(in mass fraction)for 1000,1500 and 2000 h,respectively.The results showed that af-ter corrosion test,the high entropy alloy did not show obvious signs of being attacked by molten Pb-Bi eu-tectic,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-Ni-Al phase region.In conclusion,the oxide scales formed on the high-entropy alloy are very thin and com-pact,with a maximum thickness less than 3 μm,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 ho-mogeneous distribution of Laves phase,which effectively suppresses the outward diffusion of compo-nents of the high-entropy alloy.

Fe34Cr30Mo15Ni15Nb3Al3 high-entropy alloyLiquid lead-bismuth eutectic alloy corrosionLaves phaseFe-Cr spinel

潘宗宇、刘静、姜志忠、罗林、贾寒冰、刘欣雨

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l安徽大学物质科学与信息技术研究院 合肥 230601

中国科学院合肥物质科学研究院核能安全技术研究所 合肥 230031

中国科学技术大学 合肥 230026

Fe34Cr30Mo15Ni15Nb3Al3高熵合金 液态铅铋合金腐蚀 Laves相 Fe-Cr尖晶石

国家重点研发计划中国科学院合肥大科学中心重点研发项目中国科学院合肥物质科学研究院院长基金

2022YFB19025022022HSC-CIP028YZJJ2022QN39

2024

中国腐蚀与防护学报
中国腐蚀与防护学会 中国科学院金属研究所

中国腐蚀与防护学报

CSTPCD北大核心
影响因子:0.819
ISSN:1005-4537
年,卷(期):2024.44(5)