Structure of interface in Al-TiB2 composite studied by tem
Aleksander Kostka*, Józef Lelątko*, Marek Gigla*, Henryka Morawiec*, Andrzej Janas** *Uniwersytet Śląski, Instytut Fizyki i Chemii Metali, ul. Bankowa 12, 40-007 Katowice **Akademia Górniczo-Hutnicza, Wydział Odlewnictwa, al. Mickiewicza 30, 30-059 Kraków
Annals 2 No. 5, 2002 pages 297-301
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abstract The interface microstructure of Al-TiB2 composite was studied using the SEM, HREM, CBED and X-ray phase analyses. The micrograph of the studied composite (Fig. 1) shows homogenous arrangement of the TiB2 particles in aluminum matrix. The matrix show presence of relatively high dislocation density (Fig. 2). Some strongly refined phase were observed (Fig. 3). Fast Fourier transform of the HREM image obtained from that phase (Fig. 4) show that it can be strongly refined phase of titanium-boron. HREM images of the interface (Fig. 5) of the composite, after the computer processing, exhibit dislocation presence. The local strength of the matrix was investigated near the TiB2 particles, using TEM at CBED mode. Figure 6 shows studied area with well visible dots of the CBED measurement. Analyses of the HOLZ lines from CBED diffraction patterns (Fig. 7) allowed to determine changes of the lattice constant versus interface distance (Fig. 8).