Fabricación y caracterización de materiales compuestos de matriz metálica Al-Cu y Al-Mg reforzados con partículas de TiC

Abstract

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$^\circ$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 CuAl$_{2}$ phase, the amount increasing with the Cu content in the composites. For the AlMg$_{x}$ matrix composites, no reaction phase was detected.