Tailoring ultrafine grained and dispersion-strengthened Ti₂AlC/TiAl composite via a new fabrication route

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• 作者：TAOTAO AI ; QI YU ; WENHU LI ; XIANGYU ZOU ; ZHIFENG DENG…
• 关键词：Metal–matrix composites ; mechanical properties ; microstructures ; sintering
• 刊名：Bulletin of Materials Science
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：39
• 期：5
• 页码：1259-1262
• 全文大小：751 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Engineering, general
  
• 出版者：Springer India
• ISSN：0973-7669
• 卷排序：39

文摘

In situ Ti₂AlC/TiAl composite was fabricated by hot-pressing method via the reaction system of Ti₃AlC₂ and Ti-Al pre-alloyed powders at low temperature of 1150°C. The composite mainly consisted of TiAl, Ti₃Al and Ti₂AlC phases. Fine Ti₂AlC particles were homogeneously distributed and dispersed in the matrix. Ti₂AlC played the significant role of deflecting and blunting the cracks and contributed to improve the mechanical properties of the composite. The Vickers hardness, flexural strength and fracture toughness were 6.2 GPa, 993.9 ± 50.8 MPa and 6.7 ± 0.3 MPa m 1/2, respectively.