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Titanium matrix composites reinforced with a-Al_2O_3 and TiB_2 particles were fabricated by in situ synthesis from a Ti-Al-B_2O_3 system. The reaction processes and microstructure were analyzed by using differential scanning calorimetry(DSC), scanning electron microscopy(SEM) and X-ray diffraction(XRD). The results showed that the reactions in the Ti-Al-B_2O_3 system can occur spontaneously and consist of three steps: 1) 15 Al + 7B_2O_3 → 7α-Al_2O_3 + AlB_(12) + 2B; 2) 14 B + 2Al → AlB_(12) + AlB_2 and 3) 7Ti + AlB_(12) + AlB_2 → 7TiB_2 + 2Al. The final reinforcements were composed of a-Al_2O_3 and TiB_2 particles, which were uniformly distributed in the titanium matrix.
Titanium matrix composites reinforced with a-Al 2 O 3 and TiB 2 particles were fabricated by in situ synthesis from a Ti-Al-B 2 O 3 system. The reaction processes and microstructure were analyzed by using differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and X The results showed that the reactions in the Ti-Al-B 2 O 3 system can occur spontaneously and consist of three steps: 1) 15 Al + 7B 2 O 3 → 7α-Al 2 O 3 + AlB 12 + 2B; 2) 14 B + 2Al → AlB 12 + AlB 2 and 3) 7Ti + AlB 12 + AlB 2 → 7TiB 2 + 2Al. The final reinforcements were composed of a-Al 2 O 3 and TiB 2 particles, which were uniformly distributed in the titanium matrix.