Excellent Hydrogen Embrittlement Resistance of CoCrFeMnNi high-entropy Alloy Compared with 304 and IN718 Alloys | Chapter 8 | Current Innovations in Chemical and Materials Sciences Vol. 4

 The hydrogen embrittlement (HE) presence of the CoCrFeMnNi high-deterioration alloy (HEA), 304 stainless gird (304SS) and IN718 alloy were studied by way of slow strain rate tensile tests, and break surface analysis before and after electrochemical hydrogen pre-taxing. An equiatomic CoCrFeMnNi ingot was adapted by using drawing levitation softening technology. Clean metals (>99.9 wt.%) were used all the while this process. The results demonstrate that the HEA shown the greatest HE-fighting, followed by 304SS and then IN718 alloy, when the alloys were accused at 1.79 mA cm-2 for 24 h and 48 h, and 179 mA cm-2 for 2 h. Hydrogen-induced decline in ductility was noticed for 304SS and IN718 alloys, whereas the hydrogen-impressed fracture strain of the HEA was helpless on the hydrogen charging period. The short hydrogen changing opportunity 24h showed an bettering in the resistance to HE while it reduced at the 48h taxing time. This is accredit the competing methods between hydrogen-embellished twin formation and HEDE (hydrogen-reinforced decohesion). The number of nano twins (2.71) and the breadth of SF bundles (5.77 nm) in the hydrogen-assisted tense zone is higher in amount in uncharged samples (2.57 and 5.02 nm). It clearly illustrates that the presence of hydrogen promotes the establishment of stacking faults and identical twins in CoCrFeMnNi alloy.

Author(s) Details:

Xinfeng Li,
Sino-French Institute of Nuclear Engineering and Technology, Sun Yat-Sen University, Zhuhai, 519082, China.

Zheng Feng,
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.

Xiaolong Song,
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China.

Tang Gu,
College of Mechanical and Electrical Engineering, Harbin Engineering University, Harbin, 150001, China.

Yong Zhang,
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083, China.

Please see the link here: https://stm.bookpi.org/CICMS-V4/article/view/12979