Intermediate Temperature Fatigue Induced Precipitation and Associated Corrosion in CrMnFeCoNi High Entropy Alloy  

作　　者：Tiezhuang Han Jing Wang Bo Li Shuang Li Kaisheng Ming Fucheng Wang Bin Miao Shijian Zheng 

机构地区：[1]Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology,School of Materials Science and Engineering,Hebei University of Technology,Tianjin,300401,China

出　　处：《Acta Metallurgica Sinica(English Letters)》2023年第11期1857-1869,共13页金属学报（英文版）

基　　金：the National Natural Science Foundation of China(Nos.52201072,12204143 and 52101013);the Natural Science Foundation of Hebei Province(No.E2020202009);the Technology Project of Hebei Education Department(No.QN2020150);the China Postdoctoral Science Foundation(No.2020M680843);the Central Funds Guiding the Local Science and Technology Development of Hebei Province(No.226Z1001G);the Central Funds Guiding the Local Science and Technology Development of Hebei Province(No.226Z1012G).

摘　　要：Understanding the corrosion behavior of high entropy alloys(HEAs)after intermediate temperature fatigue is critical to prevent their catastrophic failures from the reduction of corrosion resistance.Here,we investigated the corrosion behavior of CrMnFeCoNi HEA after 500℃ fatigue test with strain amplitudes of 0.2%and 0.5%.The intermediate temperature fatigue induced two types of precipitates,which were determined as Cr-richσphase and NiMn-rich L10 phase.Higher strain amplitude not only promoted precipitates generations but also spread the nucleation sites from intergranular to both intergranular and intragranular.Furthermore,we found that the deterioration in corrosion resistance of the alloy was derived from the increase of precipitates,which destroyed the stability of the passive film.The above results revealed that intermediate temperature fatigue impaired the stabilization of the solid solution state and subsequent corrosion resistance of CrMnFeCoNi HEA,where the higher strain amplitude led to more precipitates and more severe corrosion.

关 键 词：High entropy alloy CORROSION Intermediate temperature fatigue Phase stability PRECIPITATE 

分 类 号：TG139[一般工业技术—材料科学与工程]