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Topography of brittle fracture surfaces of titanium aluminide alloy as revealed by a scanning tunneling microscope
，-0001，（）：
The brittle fracture surfaces of Ti3AI+Nb and Ti3A1 were investigated with a scanning tunneling microscope (STM) under ambient conditions using a mechanically cut platinuin iridium alloy wire and electrochemically etched tungsten tips. The results show that the fracture surf'aces consist of cleavage steps with dimensions of the order of 2nm for Ti3AI+Nb and 60nm for Ti3AI, similar to cleavage surfaces observed by scanning electron microscopy. Some cavities between the microcleavage steps on the scale of a few nanometers were observed for Ti3AI+Nb. The reproducibility of the STM images under ambient conditions depends on the applied bias voltage. The quality of the STM images obtained via tungsten tips is better.
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