Tailoring ultrafine grained and dispersion-strengthened Ti$_2$AlC/TiAl composite via a new fabrication route

Bulletin of Materials Science

关键词: Metal–matrix composites;    mechanical properties;    microstructures;    sintering.;   

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

In situ Ti$_2$AlC/TiAl composite was fabricated by hot-pressing method via the reaction system of Ti$_3$AlC$_2$ and Ti-Al pre-alloyed powders at low temperature of 1150$^{\circ}$C. The composite mainly consisted of TiAl, Ti$_3$Al and Ti$_2$AlC phases. Fine Ti$_2$AlC particles were homogeneously distributed and dispersed in the matrix. Ti$_2$AlC 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, $993.9\pm 50.8$ MPa and $6.7\pm 0.3$ MPa m$^{1/2}$, respectively.

【 授权许可】

CC BY