【摘要】 对C、Ti比x分别为 0 .6、0 .75、0 .8和 0 .9的四种不同TiCx/NiAl复合材料进行扫描电镜研究 ,发现陶瓷颗粒随着C、Ti比的增加而变小 ,并且Ti元素向金属相存在较强的扩散 ,而Ni和Al元素几乎没有向陶瓷相中扩散 ,扩散形成了两相界面处直接的原子结合 ,提高了复合材料相界面结合的强度和韧性。利用纳米压痕技术得出材料相界面附近的纳米硬度H和弹性模量E呈连续梯度分布 ,C、Ti比为 0 .75的复合材料相界面处的纳米硬度和弹性模量值较大。更多还原

【Abstract】 Four different C∶Ti ratios TiC x/NiAl composites were studied by using SEM and its attached EDS. The particle size of the TiC x decreased with the C∶Ti ratio increasing from 0.6 to 0.9. Strong diffusion of Ti from the ceramic phase to the intermetallic resulted in enhancement of the interfacial strength owing to atomic bonding at the interface. The mechanical properties at the interfaces of TiC x/NiAl composites were investigated using nanoindentation technique. It was found that the nanohardness and elastic modulus in the boundary of TiC x and NiAl are of gradient distribution. The elastic modulus at the interface and the interfacial nanohardness reached high values at x equal to 0.75.更多还原