Abstract
In this study, bulk fine structured B4C/2024 Al composites with various B4C content are prepared by mechanical milling and subsequent hot consolidation. Scanning electron microscopy (SEM) observation revealed that the higher the B4C content, the finer the B4C particle size in the bulk composites. Transmission electron microscopy (TEM) observation indicates that the grain size of the Al matrix around the B4C particles is much finer compared to other, area due to the large difference in coefficients of thermal expansion (CTE) between the Al matrix and the B4C particles. Room temperature compression test reveals that with increasing B4C content, the compression strength of the bulk samples first increases and then decreases. The significant change of the mechanical properties is discussed based on the microstructure observed.
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