ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract The phase transformation of δAl2O3 occurring in Saffil fibres during their infiltration with molten Mg-8 wt% Li alloy was studied by secondary ion mass spectroscopy, X-ray diffraction and infrared spectroscopy methods. It has been shown, that lithium penetrates very quickly into the whole fibre volume, attaining up to Li/Al ≈ 0.25–0.30 ion ratio. The metastable spinel-like compound, γ(Li), was formed by incorporation of Li+ ions into the δAl2O3 lattice in which the basic spinel structure unit has been assigned by the formula Al8 [Al(40−x)/3□(8−2x )/3]Li x ]O32. During long-term annealing, a further transformation γ(Li) → LiAl5O8 proceeded, and LiAlO2 aluminate was also identified in Saffil fibres with high Li/Al concentration ratio values. In parallel with lithium, magnesium also penetrated the Saffil fibres within an infiltration period; however, the incorporation of magnesium into the spinel lattice has not been observed.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00357869
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