It has been expected that mechanical properties of a composite can be enhanced effectively by increasing the content of reinforcing particles to high levels, for which a simultaneous fulfillment of high content and uniform distribution of reinforcing particles is key. In this study, we fabricated Al-TiAl₃-Al₂O₃ composites from starting materials of Al sheets and TiO₂ nanopowders by combining accumulative roll-bonding and spark plasma sintering processes. The microstructure and mechanical properties of the samples were investigated. The as-prepared samples contain hybrid TiAl₃ and Al₂O₃ particles with total volume fractions up to 66.1-81.5% that were formed in situ by the reaction of Al and TiO₂ with much smaller volume fractions (6.7-13.9%). The composites exhibit a microhardness up to ∼532 HV and high strengths up to ∼1312 MPa at room temperature, ∼919 MPa at 300 °C and ∼565 MPa at 600 °C. The superior mechanical properties of the composites at ambient and elevated temperatures can be attributed to the high volume fraction of reinforcing particles with meanwhile uniform distribution, for which different strengthening mechanisms were discussed.

期望通过将增强颗粒的含量增加至高水平可以有效地增强复合材料的机械性能，为此，同时满足高含量和均匀分布的增强颗粒是关键。在这项研究中，我们通过结合累积的辊压粘结和火花等离子烧结工艺，从Al片材和TiO ₂纳米粉体的原材料制备了Al-TiAl ₃ -Al ₂ O ₃复合材料。研究了样品的微观结构和力学性能。所制备的样品包含混合的TiAl ₃和Al ₂ O ₃Al和TiO ₂具有较小体积分数（6.7-13.9％）的反应原位形成的总体积分数高达66.1-81.5％的颗粒。该复合材料在室温下具有高达〜532 HV的显微硬度，在高达〜1312 MPa时具有高强度，在300°C时具有919 MPa和在600°C时具有565 MPa的高强度。复合材料在环境温度和高温下的优异机械性能可归因于增强颗粒的高体积分数，同时具有均匀的分布，为此讨论了不同的增强机理。