Abstract
The aluminum matrix composites (AlB2+α-Al2O3)/Al were fabricated by in situ reaction synthesis from an Al-B2O3 system. The reaction pathways, apparent activation energies and tensile properties were analyzed by using differential scanning calorimetry (DSC), X-ray diffraction (XRD), scanning electron microscopy (SEM), and equipped energy dispersive spectroscopy (EDS). The results showed that there are two-step reactions in the Al-B2O3 system. The first-step is 15Al+7B2O3→7α-Al2O3+AlB12+2B and the second-step is 2B+AlB12+6Al→7AlB2. Their corresponding apparent activation energies are 352 and 444 kJ/mol, respectively. The tensile strength and elongation rate of the composites are 190.5 MPa and 6.6%, respectively.Compared with ordinary aluminum base material, the performance is superior. There are many dimple and cracked α-Al2O3 reinforcements in tensile fracture surface layer.
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