Effect of MoO₃ on microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃ composites by in situ reactive hot pressing

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• 作者：Fen Wang ; Yuanbo Zhao ; ^{zhaoyuanbo199015@163.com" class="auth_mail" title="E-mail the corresponding author} ; Chenhui Yang ; Ningxia Fan ; Jianfeng Zhu
• 关键词：(Ti ; Mo)Al/Al2O3 composites ; In situ hot-pressing ; Mechanical property ; Microstructure
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：1-8
• 全文大小：3691 K

文摘

(Ti,Mo)Al/Al₂O₃ composites were successfully synthesized by hot pressing based on the Ti–Al–TiO₂–MoO₃ system. Effect of MoO₃ content on the microstructure and mechanical properties of (Ti,Mo)Al/Al₂O₃ composites was investigated in detail. It was found that the as-fabricated samples contain TiAl, Ti₃Al, and Al₂O₃, together with a small amount of Ti₂AlMo phase reinforcement phase. The fine Al₂O₃ particles dispersed on the TiAl matrix grain boundaries as a network structure and resulted in the improvement of room mechanical properties of the composites. With increasing of MoO₃ contents, the flexural strength and fracture toughness of (Ti,Mo)Al/Al₂O₃ composites gradually increase, and with 1.0 at% MoO₃, doped the products possess the maximum value of 702 MPa and 8.3 MPa m^1/2 for the flexural strength and fracture toughness, respectively.