采用固态置换反应原位合成工艺,利用Al-Ti-TiO_2-Ho_2O_3体系的放热反应合成了HoAl-Al_2O_3/TiAl复合材料.利用XRD和SEM分析了Ho_2O_3掺杂对原位合成HoAl,Al_2O_3颗粒强化钛铝基复合材料显微组织的影响,探讨了稀土氧化物(Ho_2O_3)的细化机制.测试了力学性能.结果表明:Al-Ti-TiO_2-Ho_2O_3系原位合成的HoAl-Al_2O_3/TiAl复合材料由TiAl,Ti_3Al,Al_2O_3以及HoAl相组成;HoAl金属间化合物弥散分布于基体晶粒和Al_2O_3颗粒交界处,限制颗粒长大,细化基体晶粒与Al_2O_3颗粒,同时提高了HoAl,Al_2O_3颗粒在基体中的分散度;Ho_2O_3的引入改善了复合材料的力学性能.
HoAl-Al_2O_3/Ti aluminide composites reinforced by Ho_2O_3 were prepared by in-situ hot-pressing method with the exothermic reaction of Al, Ti, TiO_2 and Ho_2O_3 powder. The effect of Ho_2O_3 doping on the microstructures was analyzed by XRD, SEM. Bending strength and fracture toughness properties were tested. The refinement mechanism of rare-earth oxide was investigated as well. The results show the phases of the composites are composed of TiAl, Ti3Al, Al_2O_3 and HoAl. The HoAl particles distributed at grain boundary of the matrix and Al_2O_3 particles. At the same time, it restricted particle size and increased particle dissemination of the HoAl, Al_2O_3. The mechanical property of composites reinforced by Ho_2O_3 were increased.
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