Microstructural evolution and mechanical properties of network-structure Ti2AlC/TiAl composites prepared by spark plasma sintering

作者：Dongdong Zhu, Jiangfei Yan, Yupeng Wang, Duo Dong, Xiaohong Wang, Teng-Fei Ma, Zunjie Wei · 发表于：Transactions of Nonferrous Metals Society of China · 年份：2025 · DOI：10.1016/s1003-6326(25)66814-2 · 被引用次数：8 · 研究领域：MXene and MAX Phase Materials、Intermetallics and Advanced Alloy Properties、Inorganic Chemistry and Materials

Ti 2 AlC/TiAl composites with a network structure were successfully prepared with carbon nanotubes and Ti−45Al−8Nb pre-alloyed powder using spark plasma sintering. The effects of sintering temperature (1200−1350 °C) on the microstructural evolution and mechanical properties were systematically investigated. The microstructure of Ti 2 AlC/TiAl composites exhibits duplex, near-lamellar, and fully lamellar structures, as the sintering temperature increases from 1200 to 1350 °C. The network structured Ti 2 AlC phase can refine the microstructure and the phase becomes discontinuous at high sintering temperatures. Notably, composites sintered at 1300 °C exhibit excellent mechanical properties, with the highest compressive strength (1921 MPa) and fracture strain (26%) at room temperature. Moreover, the ultimate tensile strength and fracture strain reach 537 MPa and 3.1% at 900 °C, and 485 MPa and 3.3% at 950 °C, respectively. The enhancement of the mechanical properties is attributed primarily to the load bearing, particle pull-out, and inhibition of crack propagation induced by Ti 2 AlC particles.