what is the mechanism behind reduction in coefficient of thermal expansion of composites in which Si powders are incorporated in Al matrix as compared to pure Al?
Dear Ravi Joham,
In a first approach I would suggest no mechanism, but the rule of mixtures. When applied this rule indicates that the resulting average coefficient of thermal expansion for an Al Si mixture is smaller than the coefficient of thermal expansion of pure Al, as for Si the value of the thermal expansion coefficient is much smaller than for pure Al. Surprising effects of this difference are dealt with in the Reference given by the link.
Article Unusual lattice parameters in two-phase systems after annealing
Elsewhere at this forum I have proposed (derived) a mixture rule to approximately predict the coefficient of thermal expansion (CTE) of isotropic and non-porous composite materials, from those of its components: https://www.researchgate.net/post/I_want_to_theoretically_calculate_the_CTE_of_particle_loaded_glass_reinforced_vinyl_ester_composite_Which_relation_will_give_better_results
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