论文部分内容阅读
采用放电等离子技术(SPS),利用Ti-Al-Ti_3AlC_2体系的原位反应制备Ti_2AlC/TiAl基复合材料。借助XRD、SEM和OM分析其组成及显微结构。结果表明,1100℃烧结后,Ti_3AlC_2全部转化为Ti_2AlC。产物由TiAl、Ti3Al和Ti_2AlC相组成。Ti_2AlC呈颗粒状分布于基体晶界处,部分钉扎于晶内。当Ti_3AlC_2掺杂量为10%时,综合力学性能最佳,维氏硬度、断裂韧性和抗弯强度分别达到了4.9 GPa、7.41 MPa·m1/2和699.9 MPa,较TiAl合金有较大提升。
In situ reaction of Ti-Al-Ti_3AlC_2 system was used to prepare Ti_2AlC / TiAl matrix composites by using discharge plasma technique (SPS). The composition and microstructure were analyzed by XRD, SEM and OM. The results show that all of Ti 3 AlC 2 is transformed into Ti 2 AlC after sintering at 1100 ℃. The product consists of TiAl, Ti3Al and Ti_2AlC phases. Ti_2AlC particles are distributed in the matrix grain boundaries, part of the pinning in the crystal. When the amount of Ti_3AlC_2 doping is 10%, the mechanical properties are the best, Vickers hardness, fracture toughness and flexural strength reach 4.9 GPa, 7.41 MPa · m1 / 2 and 699.9 MPa respectively, which is much higher than TiAl alloy.