Thermal desorption spectroscopy (TDS) technique has been used to study hydrogen behaviour in rapidly solidified (RS) aluminium (Al) both as-cast and exposed to humid air (HA). The surface morphology of the foils was studied through atomic force microscopy (AFM). Analysis was made of the effect of rapid solidification processing (RSP) on H/microstructure interactions, including investigation of alloying element (0.05 at % Ti) influence on H trapping in Al.
The thermal desorption spectroscopy has been applied to analyse hydrogen desorption from foils of Al-Cr alloys containing up to 3.0 mol% Cr produced by centrifugal melt quenching. Surface morphology of the alloys was monitored using atomic force microscopy and scanning electron microscopy. It was revealed that hydrogen behaviour is strongly affected by microstructural features available due to rapid solidification and represents at least four hydrogen trap sites in Al-Cr alloys. The Cr atoms in lattice sites are identified as predominant trap site. The occupancy of dislocations was estimated to be rather high in contrast to vacancies and pores in alloys. The amount of hydrogen trapped by vacancies is drastically decreased with increase in Cr concentration. These hydrogen/microstructure interactions were discussed regarding rapidly solidified pure aluminum as well as traditionally processed aluminum samples.
The wettability of rapidly solidified foils of Al-In alloys containing up to 4.7 at.% of In was investigated by means of sessile-drop method and atomic force microscopy. It was found that In significantly changes wetting properties of pure Al from a hydrophobic behaviour to a hydrophilic one. The effect of topography on the wetting properties of nano-rough foils demonstrates that an increase in In content up to 0.7 at.% resulted in a transition from a homogeneous to a heterogeneous wetting behaviour when decreasing the roughness of the surface makes it more hydrophilic. Streszczenie. Zwilżalność szybko skrystalizowanych foli stopu Al-In zawierających In do 4,7 at.% została zbadana za pomocą metody "siedzącej kropli" oraz mikroskopii sił atomowych. Określono, że dodatek In znacząco zmienia właściwości zwilżające czystego Al z hydrofobowych na hydrofilowe. Wpływ topografii na właściwości zwilżające nano-chropowatych folii przedstawia, że wzrost zawartości In do 0,7 at.% skutkuje w zmianie właściwości zwilżających z homogenicznych na heterogeniczne oraz zwiększająca się chropowatość powierzchni powoduje, że stają się one hydrofilowe. (Wpływ topografii powierzchni na zwilżalność szybko skrystalizowanego stopu Al-In).
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