文献类型：期刊文献

英文题名：Enhancement of hydrogen embrittlement resistance in CoCrFeNi high-entropy alloy through the addition of MoB elements

作者：Li, Xinfeng[1];Cui, Yan[2,3];Zhang, Jin[4]

机构：[1]Sun Yat Sen Univ, Sino French Inst Nucl Engn & Technol, Zhuhai 519082, Guangdong, Peoples R China;[2]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China;[3]East China Univ Sci & Technol, Inst Fine Chem, Feringa Nobel Prize Scientist Joint Res Ctr, Sch Chem & Mol Engn, Shanghai 200237, Peoples R China;[4]Beijing Normal Univ, Fac Arts & Sci, Zhuhai 519087, Peoples R China

年份：2024

卷号：92

起止页码：1306

外文期刊名：INTERNATIONAL JOURNAL OF HYDROGEN ENERGY

收录：;EI(收录号：20244517307906);WOS:【SCI-EXPANDED(收录号:WOS:001349527100001)】；

基金：This work was supported by the National Natural Science Foundation of China (Grant No. 12104057) , the Guangdong Basic and Applied Basic Research Foundation (2023A1515240074) . Yan C. acknowledges the support by National Natural Science Foundation of China (Grant No. 52005184) .

语种：英文

外文关键词：High-entropy alloy; Tensile tests; Hydrogen embrittlement; Gradient twins

摘要：The effect of co-existence of Mo and B on hydrogen embrittlement (HE) of equiatomic CoCrFeNi and (CoCrFeNi)96.96Mo3B0.04 (MoB-doped) alloys are investigated through electrochemical hydrogen charging, tensile tests and advanced microstructural characterization. The MoB-doped alloy exhibits higher HE resistance than CoCrFeNi alloy, which is attributed to MoB-promoted twinning deformation process instead of conventionally strengthening grain boundary (GB) effect resulting from Mo and B segregation. As hydrogen charging time increases, the ductility of both alloys first increases and then decreases, which correlates with the competition relation between H-promoted formation of gradient twins/stacking faults and hydrogen-enhanced decohesion mechanism. For the samples charged 3 h, the beneficial effect of gradient nanostructure caused by chemical composition gradients of hydrogen overcompensates its HE effect, leading to the defeating HE of the alloys by hydrogen itself. This result indicates that the introduction of gradient nanostructures through hydrogenconcentration gradients could be a way forward for designing hydrogen-tolerant alloys.