The Mechanism of the High Resistance to Hydrogen-Induced Strength Loss in Ultra-High Strength High-Entropy Alloy

The resistance of the Al0.5Cr0.9FeNi2.5V0.2 high-entropy alloy (HEA) to hydrogen embrittlement (HE) was investigated by a slow strain rate test (SSRT), and the fracture surface was examined through a scanning electron microscope. Compared with other high-strength steels, Al0.5Cr0.9FeNi2.5V0.2 showed...

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Bibliographic Details
Published in:Metals (Basel ) 2022-06, Vol.12 (6), p.971
Main Authors: Gao, Zhenhuan, Xue, Yunfei, Li, Jinxu, Xu, Lining, Qiao, Lijie
Format: Article
Language:English
Subjects:
Alloys
Dimpling
dislocation
Dislocation density
Ductility
Fracture surfaces
Fractures
Grain boundaries
High entropy alloys
High resistance
High strength alloys
High strength steels
high-entropy alloy
Hydrogen
Hydrogen charging
Hydrogen embrittlement
hydrogen-induced strength loss
Mechanical properties
Morphology
precipitate
Precipitates
Slow strain rate
Steel
Stress-strain curves
Tensile strength
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Summary:The resistance of the Al0.5Cr0.9FeNi2.5V0.2 high-entropy alloy (HEA) to hydrogen embrittlement (HE) was investigated by a slow strain rate test (SSRT), and the fracture surface was examined through a scanning electron microscope. Compared with other high-strength steels, Al0.5Cr0.9FeNi2.5V0.2 showed insignificant strength loss after hydrogen charging. The fracture surface of the hydrogen-charged specimens mainly consisted of dimples, and no intergranular morphology was observed. The coupling effect of the dispersed nano-structured precipitates and high-density dislocations in Al0.5Cr0.9FeNi2.5V0.2 improves the resistance to hydrogen-induced strength loss.
ISSN:2075-4701
2075-4701
DOI:10.3390/met12060971