Abstract
<p class="AMSmaintext">Gibbs free energy of chemical reactions between SiC particles and the Mg matrix at the different temperature has been calculated based on the Gibbs-Helmholtz equation and thermodynamic equilibrium of chemical reactions. The thermodynamic stability of Al<sub>4</sub>C<sub>3</sub> and MgAl<sub>2</sub>O<sub>4 </sub>in the interface was investigated. The results showed that when the activity of Si on interface is more than a critical value of A°si . A stable Al<sub>3</sub>C<sub>4 </sub>cannot formed when A si is more than A°si, which is not a constant, increasing with the temperature. The mass fraction and distribution of SiO<sub>2</sub>in the interface have directly effects on the reactions of SiO<sub>2 </sub>with Mg and Al. There is a critical value of A °Mg , A °Al and A 1Al , which increases with the temperature. When the mass fraction of Si in the interface is greater than a critical value, there is no interfacial reaction at a certain temperature. The interface reaction models have been proposed.</p>
Highlights
Particle reinforced magnesium matrix composites have a high specific strength and modulus of elasticity, good damping properties and low coefficient of thermal expansion, which have a great potential in aerospace, automotive and military fields
The effect of the distribution of SiC particle size on magnesium matrix composites has illustrated that the reinforcing effect is optimal due to the particles completely distributed in grains [5]
In the SiCp/AZ91D composites fabricated by vacuum pressure infiltration process, the SiC particles were homogenously distributed, the interface bonding of the particles and the matrix were favourable [7]
Summary
Particle reinforced magnesium matrix composites have a high specific strength and modulus of elasticity, good damping properties and low coefficient of thermal expansion, which have a great potential in aerospace, automotive and military fields. The thermodynamic conditions of interface reactions in the SiC/Mg matrix composite, thermodynamic stability of Al4C3 and MgAl2O4 and the process of interfacial reactions have been investigated.
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