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6. Initiating, growing and cracking of hydrogen blisters

Author

Qiao Lijie, Cui Yinhui, Shan Guangbin, Jiang Bo, SU Yanjing, Chu Wuyang, Ren Xuechong, Chen Gang, and Gao Kewei

Subjects
Supersaturation, Multidisciplinary, Materials science, Amorphous metal, Hydrogen, Metallurgy, chemistry.chemical_element, Blisters, law.invention, Cracking, chemistry, Optical microscope, law, Vacancy defect, Cluster (physics), medicine, medicine.symptom, Composite material
Abstract

The growing process of a hydrogen blister in a wheel steel was observed in situ with an optical microscope, and the fracture surfaces formed from broken blisters on a wheel steel and bulk metallic glass were investigated. The initiating, growing, cracking and breaking of hydrogen blisters are as follows. Supersaturated vacancies can increase greatly during charging and gather together into a vacancy cluster (small cavity). Hydrogen atoms become hydrogen molecules in the vacancy cluster and hydrogen molecules can stabilize the vacancy cluster. The small cavity becomes the nucleus of hydrogen blister. The blister will grow with entering of vacancies and hydrogen atoms. With increasing hydrogen pressure, plastic deformation occurs first, the hydrogen blister near the surface extrudes, and then cracks initiate along the wall of the blister with further increasing hydrogen pressure. A cracked blister can grow further through propagating of cracks until it breaks.

Published
2005

7. Initiating, growing and cracking of hydrogen blisters.

Author

Ren Xuechong, Shan Guangbin, Chu Wuyang, Su Yanjing, Gao Kewei, Qiao Lijie, Jiang Bo, Chen Gang, and Cui Yinhui

Subjects
HYDROGEN, MICROSCOPES, METALLIC glasses, MOLECULES, PHYSICAL & theoretical chemistry
Abstract

The growing process of a hydrogen blister in a wheel steel was observed in situ with an optical microscope, and the fracture surfaces formed from broken blisters on a wheel steel and bulk metallic glass were investigated. The initiating, growing, cracking and breaking of hydrogen blisters are as follows. Supersaturated vacancies can increase greatly during charging and gather together into a vacancy cluster (small cavity). Hydrogen atoms become hydrogen molecules in the vacancy cluster and hydrogen molecules can stabilize the vacancy cluster. The small cavity becomes the nucleus of hydrogen blister. The blister will grow with entering of vacancies and hydrogen atoms. With increasing hydrogen pressure, plastic deformation occurs first, the hydrogen blister near the surface extrudes, and then cracks initiate along the wall of the blister with further increasing hydrogen pressure. A cracked blister can grow further through propagating of cracks until it breaks. [ABSTRACT FROM AUTHOR]

Published
2005
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