Abstract
In this work the influences of Boron (B) content on the microstructure, hardness and mechanical properties of Al–15%Mg 2Si composite were investigated. The results showed that with the increase of B content, the average size of primary Mg 2Si particles decreased from ∼23 to ∼5 μm and the volume fraction of them decreased too, but the amount of alpha phase increased. It was found that with the addition of 0.3%B, the ultimate tensile strength (UTS) and elongation values reached from 252 to 273 MPa and 2.2% to 3.7%, respectively. It was revealed from hardness tests that B decreases the hardness values of the composite. Also, a small amount of Boride compounds formed as a result of the addition of B, which were the main reason of the decreasing of tensile properties at samples with high B.
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