Czasopismo | INŻYNIERIA MATERIAŁOWA | Rocznik 2013 - zeszyt 3

Effect of MgO single crystal orientation on microstructure of reaction products formed in liquid Al/MgO couples

nr katalogowy: 78032

Aluminium is a common alloying addition in many industrially important high temperature alloys, while MgO is either main constituent or sintering aid in advanced refractories used in melting and casting of such alloys. Thus information on reactivity in Al/MgO system is of a great practical importance. Furthermore, knowledge on interaction at the Al/MgO interface is vital for understanding the mechanism of in-situ synthesis of DIMOX (Direct Matrix Oxidation) type composites, i.e. Al-Al2O3 [1, 2]. The early wetting experiments [3?€6] performed in vacuum with Al/MgO system showed that liquid Al reacts with MgO to form inside the substrate a thick reaction product region (RPR). Both its thickness and structure were found to depend on substrate structure (monocrystalline or polycrystalline, crystallographic orientation). Mcevoy et al. [3] suggested the formation of MgAl2O4 inside the RPR, while Fujii and Nakae [4] reported Al2O3. However, the more recent study of the group led by Fujii [5] clearly evidenced that both MgAl2O4 and Al2O3 phases can be formed. Simultaneously, they claimed that the type of alumina formed in RPR depends on the substrate orientation, i.e. ?ż-Al2O3 for (100) MgO and ?Č?Ś- ?Č- and ?Â-Al2O3 for (110) MgO and (111) MgO, respectively. Our experiments involving [100], [110] and [111] MgO substrates showed that in all cases, the reaction starts with the formation of Al2O3 separated by Al channels [6?€8]. Only in later stages, locally the layer composed of MgAl2O4 and Al starts to form as well [6, 7]. The analysis of the electron diffraction patterns acquired from the Al2O3 crystallites indicated that they were always of the same corundum ?ż-Al2O3 type, independently of substrate orientation. The characterization of RPR microstructure in the Al/MgO is as important as phase identification but the former so far gained much less attention. The early investigation performed with the help of optical micros[...]

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