Abstract
TiB2 reinforced aluminum metal matrix composites (MMCs) were in-situ synthesized by laser surface alloying (LSA). SEM, XRD and EBSD were used to investigate the effect of TiB2 particles on the microstructure characteristics, phase constitution and crystallographic orientation. The results indicated that TiB2 particles mainly exhibited hexagonal plate-like morphology and distributed at high angle grain boundaries (HAGBs). The average grain size of the composites decreased with increasing TiB2 content, and the crystallographic orientation changed from (0 0 1) orientation to (1 1 1) and (1 0 1) orientations. The composites exhibited enhanced nanohardness of 2.74 ± 0.08 GPa, which was about 9.5 times of the matrix. Dislocation strengthening (ΔσCTE) and dispersion strengthening (ΔσOrowan) played dominating role in strengthening mechanism.
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