In this study, in situ Al₂O₃-reinforced Ti₃Al composite was fabricated after 8 h of milling and sintering at 850 °C. A mixture of TiO₂ and Al powders were mechanically milled in a planetary mill, cold-compacted and sintered under a protected argon atmosphere. The microstructure and microhardness of the Al₂O₃ embedded in Ti₃Al matrix at both room and elevated temperature has been reported. The obtained results showed that the Ti₃Al/Al₂O₃ composite was successfully synthesized via the powder metallurgy method. Ti₃Al phase and Al₂O₃ particles were formed after 8 h of milling and sintering at 850 °C. The microstructure formation of round and uniformly distributed Al₂O₃ particles in the Ti₃Al matrix improved the microhardness of the composite. At normal temperature, the microhardness of the material measured about 11.5 GPa. Meanwhile, at elevated temperatures, from 600 to 800 °C, it decreased from 4.18 GPa to 3.15 GPa.

中文翻译：

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原位合成Ti3Al / Al2O3复合材料的高温制备，显微组织和显微硬度

在这项研究中，在850°C下研磨和烧结8 h后，原位制备了Al ₂ O ₃增强的Ti ₃ Al复合材料。将TiO ₂和Al粉末的混合物在行星式研磨机中进行机械研磨，冷压并在受保护的氩气气氛下烧结。已经报道了在室温和高温下都嵌入Ti ₃ Al基体中的Al ₂ O ₃的组织和显微硬度。所得结果表明，通过粉末冶金法成功合成了Ti ₃ Al / Al ₂ O ₃复合材料。Ti ₃ Al相和Al ₂ O在850°C下研磨和烧结8小时后，形成了_3个颗粒。在Ti ₃ Al基体中形成圆形且均匀分布的Al ₂ O ₃颗粒的微观结构改善了复合材料的显微硬度。在常温下，材料的显微硬度约为11.5 GPa。同时，在从600到800°C的高温下，它从4.18 GPa降低到3.15 GPa。