Resumo

CONTRERAS, A.  e  BEDOLLA, E.. Fabricación y caracterización de materiales compuestos de matriz metálica Al-Cu y Al-Mg reforzados con partículas de TiC. Rev. mex. fis. [online]. 2004, vol.50, n.5, pp.495-500. ISSN 0035-001X.

The pressureless melt infiltration of Al-Cu and Al-Mg alloys into particulate 56 vol. % TiC preforms was studied. The infiltration of aluminum alloys varying the Mg and Cu content was compared with the infiltration rate of pure aluminum and were carried out in a thermogravimetric analyzer. It was found that the infiltration rate of Al-Mg_x increases as the magnesium content increases. On the contrary, infiltration rate of Al-Cu_x increases with decreasing copper content. For both systems the higher the temperature the faster the infiltration rate. Comparing the results at the infiltration temperature of 900°C, the infiltration rate was greater with the Al-Cu_x alloys than Al-Mg_x alloys, but never was greater than pure Al. Moreover, the infiltration of pure magnesium into the preforms was faster than the Al-Mg_x alloys. XRD studies of composites containing copper confirmed the formation of CuAl₂ phase, the amount increasing with the Cu content in the composites. For the AlMg_x matrix composites, no reaction phase was detected.

Palavras-chave : Composites; TiC; Al-Mg alloys; Al-Cu alloys; infiltration.

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