Behavior of Hydrogen in Tensile-Deformed Aluminum Alloys

Abstract:

Behavior of hydrogen in tensile-deformed Al-9mass%Mg and Al-5.8mass%Zn-2.4mass%Mg alloys was investigated by means of hydrogen microprint technique, HMPT, a method to visualize the microscopic location of hydrogen evolution from specimen surface as silver particles. Both in the two alloys, surface relief was formed at most grain boundaries by the stretching, while hydrogen evolution was observed at some grain boundaries. The evolution of hydrogen was discussed with parameters such as the angle between grain boundary on the specimen surface and tensile direction, the angle between grain boundary on the surface and slip line inside the grain, the height of the surface relief, and maximum gradient of the surface relief. The results indicated that the shear deformation along grain boundary caused transportation of hydrogen atoms with gliding dislocations to the surface, breakage of surface oxide film. In the Al-Zn-Mg alloy, it was suggested that the preferential deformation in the precipitate free zone was attributed to hydrogen evolution.

• Periodical: Materials Science Forum (Volume 941)
• Pages: 1295-1299
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.941.1295
• Online since: December 2018
• Authors: Toshiaki Manaka, Goroh Itoh*
• Keywords: Aluminium Alloy, Grain Boundary, Hydrogen, Plastic Deformation, Precipitate Free Zone

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