Abstract
AbstractThe effect induced by adding nanoparticles to cast hypo‐eutectic aluminum 7 % silicon alloys (A356) is continually reported to show enhanced mechanical properties. The experimental results show a strengthening effect associated with an increase in ductility and/or toughness, induced by adding nanoparticles. The aim of this work is to add a contribution towards understanding the strengthening effect observed in the nanoparticles‐reinforced A356 alloy. This is done by calculating the conventional incremental summation of several strengthening mechanisms contributing to strengthening and reinforcement in composites. The results obtained by applying the mathematical calculations are compared with the experimental results reported in literature. Based on the mathematical approach, this work shows that the main strengthening mechanisms acting for metal matrix nano composites (MMNCs) are those contributing to the strengthening of the matrix. These result from contributions by Orowan strengthening and coefficient of thermal expansion (CTE) and elastic modulus (EM) mismatch.
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