Although the porosity in Al-SiC metal matrix composites (MMC) can be diminished; its existence is unavoidable. The purpose of this work is to study the effect of porosity on Young's modulus of SiC reinforced aluminum matrix composites. Finite element analysis is performed based on the unit cell and the representative volume element approaches. The reliability of the models is validated by comparing the numerical predictions against several experimental data ranging in lowand high-volume fractions and good agreement is found. It is found that despite the stress transfer from the soft matrix to the reinforcement remains effective in the presence of pores, there is a drop in the stress gathering capability of the particles and thus, the resulting effective elastic modulus of composite decreases. The elastic property of the composite is more sensitive to pores away the reinforcement. It is confirmed, qualitatively, that the experimentally reported in the literature decrease in the elastic modulus is caused by the presence of pores.
The objective of this study is to analyze the effect of MgO content and the slag basicity on the stability of the mineralogical species of the SiO 2 -CaO-MgO-Cr 2 O 3 system. Slag samples were prepared in equilibrium at 1600 °C under reducing conditions (pO 2 = 10 -9 atm). The MgO content ranged from 0 to 12 mass%, Cr 2 O 3 was 10 % and the slag basicity was held at 1 and 1.
ResumenEl objetivo de este estudio es analizar el efecto del contenido de MgO y la basicidad de la escoria sobre la estabilidad de las especies mineralógicas del sistema de escoria SiO 2 -CaOMgO-Cr 2 O 3 . Se realizaron ensayos al equilibrio a 1600 °C bajo condiciones reductoras (pO 2 =10 -9 atm). El contenido de MgO fue de 0 a 12 % masa, el Cr 2 O 3 de 10% y la basicidad de 1 y 1,5. También se realizó un análisis termodinámico para determinar las fases mineralógicas más estables en la escoria. Los resultados experimentales y calculados muestran que el Cr 2 O 3 se encuentra principalmente ligado en una fase espinela MgCr 2 O 4 , incluso a bajos contenidos de MgO. Los resultados obtenidos por microscopia electrónica de barrido (MEB-EDS), muestran la evidencia de tres estructuras cristalinas: (A) Octaedros, los cuales corresponden a la espinela MgCr 2 O 4 , (B) Cristales alargados que corresponden a la formación de silicatos cálcicos y (C) Matriz de silicatos cálcicos con impurezas de Mg y Cr que no cristalizaron por completo.
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