TY - JOUR
T1 - Nanostructural approach to the thickening behavior and oxidation of calcium-stabilized aluminum foams
AU - Nayebi, Behzad
AU - Mehrabian, Mehdi
AU - Shahedi Asl, Mehdi
AU - Shokouhimehr, Mohammadreza
N1 - Publisher Copyright:
© 2018
PY - 2018/12/1
Y1 - 2018/12/1
N2 - The influences of calcium content on thickening stage, dynamic oxidation and subsequent formation of cell walls in closed-cell aluminum foams were investigated by both precise thermodynamic and experimental studies. A novel technique was also used for the sample preparation, and the compendious characterization by transmission electron microscopy. Based on nanostructural investigations, the results indicated that in low calcium amounts (0.5 wt.%), the formation of complex oxide nanoparticles plays a key role in cell wall formation and bubble stabilization, when ignoring the effect of foaming agents. The higher calcium contents (1.5 wt.%) result in different thickening mechanism in which, relatively thick and brittle complex oxide layers are formed. Breaking of these oxide layers due to mechanical stirring causes the entrapment of several fragments in the interface of bubbles and consequently lead to cell wall stabilization. Due discussions were carried out about the effects of different thickening mechanism on the mechanical behavior of cell walls.
AB - The influences of calcium content on thickening stage, dynamic oxidation and subsequent formation of cell walls in closed-cell aluminum foams were investigated by both precise thermodynamic and experimental studies. A novel technique was also used for the sample preparation, and the compendious characterization by transmission electron microscopy. Based on nanostructural investigations, the results indicated that in low calcium amounts (0.5 wt.%), the formation of complex oxide nanoparticles plays a key role in cell wall formation and bubble stabilization, when ignoring the effect of foaming agents. The higher calcium contents (1.5 wt.%) result in different thickening mechanism in which, relatively thick and brittle complex oxide layers are formed. Breaking of these oxide layers due to mechanical stirring causes the entrapment of several fragments in the interface of bubbles and consequently lead to cell wall stabilization. Due discussions were carried out about the effects of different thickening mechanism on the mechanical behavior of cell walls.
KW - Aluminum foam
KW - Cell wall
KW - Nanostructure
KW - Thickening behavior
KW - Transmission Electron Microscopy
UR - http://www.scopus.com/inward/record.url?scp=85053501267&partnerID=8YFLogxK
U2 - 10.1016/j.matchemphys.2018.09.017
DO - 10.1016/j.matchemphys.2018.09.017
M3 - Article
AN - SCOPUS:85053501267
SN - 0254-0584
VL - 220
SP - 351
EP - 359
JO - Materials Chemistry and Physics
JF - Materials Chemistry and Physics
ER -