Structure of interface in Al-TiC composite
* Henryk Morawiec, * Aleksander Kostka, * Józef Lelątko, * Marek Gigla, ** 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 1 No. 2, 2001 pages 228-232
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abstract The interface microstructure of Al-TiC composite was studied using the HREM, CBED and nanoindentation methods. The micrograph of the studied composite (Fig. 1) shows homogeneous arrangement of the TiC particles in aluminium matrix. The matrix as well as the TiC particles show the presence of relatively high dislocation density (Fig. 2). Some particles similar to Al13Fe4 phase (Tab. 1) were observed only at the grain boundaries of the matrix (Fig. 3). Obtained HREM images (Fig. 4), after the computer processing exhibit presence of dislocations on the interface. The local strength of the matrix was investigated near the TiC particles interface, using TEM at CBED mode. Figure 5a shows studied area with visible dots of the CBED measurement (Fig. 5b). Analysis of the HOLZ lines from CBED diffraction patterns allowed to determine changes of the lattice constant versus interface distance (Fig. 6). Also the near - interface region presented on Fig. 7, exhibits a higher stress field and elastic modulus which decreases with the distance of several μm (Fig. 8).