VSE knjižnice (vzajemna bibliografsko-kataložna baza podatkov COBIB.SI)
  • TEM investigation of aluminium foam with closed-cell structure
    Feizpour, Darja ; Paulin, Irena ; Jenko, Monika, metalurginja
    Aluminium foams with closed-cell structure are manufactured with different foaming agents that are gas releasing substances. Closed-cell structure has high impact energy absorption that is very ... important mechanical property in military and car industry. Metal foams are uniform dispersion of a gaseous phase in the solid metal with low densities and novel physical and mechanical properties. Direct foaming of metallic melts or indirect foaming of powder compacts are two common and cost effective methods for fabrication of metal foams. In the both routes, the stability of the foamed melt during process is of crucial importance. It is known that the melt stability can be improved by adjusting the liquid metal viscosity and its surface tension by adding fine cramic particles or introducing alloying elements into the melt. When the powder compact melting process is employed, the metal oxides covered the initial powder particles or the solid component of the particular alloy can also induce foam stabilization. The parameters of foaming process such as the foaming temperature and heating rate are also effective. The sample of closed-cell aluminium foam was manufactured from Al powder (99,7 % purity) and 1 wt.% TiH2 as a foaming agent. Thin foil specimen was prepared using argon ion-slicing with JEOL EM-09100IS Ion Slicer and further analyzed by TEM (Jeol JEM-2100) at 200 kV using conventional transmission electron microscopy (CTEM), high-resolution TEM (HRTEM), energy dispersive X-ray spectroscopy (EDXS, Jeol JED-2300 Series), electron diffraction and scanning transmission electron microscopy (STEM) with bright-field (BF) detector and EDXS mapping. The study was focused on the analysis of cell walls. Detailed characterization of the microstructure was performed on thin section specimens, and electron diffraction method was used as well to carry out the microstructure-crystallographic analysis of the phases. At least two oxide layers with different ratios of aluminium and oxygen appeared at the interface aluminium-pore. The ongoing research will clarify the course of reactions.
    Vir: Program in knjiga povzetkov = Programme and book of abstracts (Str. 44)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2011
    Jezik - angleški
    COBISS.SI-ID - 862378

Vnos na polico