Topography of brittle fracture surfaces of titanium aluminide alloy as revealed by a scanning tunneling microscope
作者:
Z. Wang,
C. Bai,
C. Dai,
G. Huang,
P. Zhang,
Y. Zhang,
W. Chu,
L. Qiao,
Y. Wang,
期刊:
Journal of Vacuum Science&Technology B: Microelectronics and Nanometer Structures Processing, Measurement, and Phenomena
(AIP Available online 1994)
卷期:
Volume 12,
issue 4
页码: 2456-2458
ISSN:1071-1023
年代: 1994
DOI:10.1116/1.587782
出版商: American Vacuum Society
关键词: TERNARY ALLOYS;TITANIUM BASE ALLOYS;ALUMINIUM ALLOYS;NIOBIUM ALLOYS;BRITTLENESS;FRACTURE SURFACES;TOPOGRAPHY;CLEAVAGE;IMAGE FORMING;STM;Ti3Al;(Ti,Al,Nb)
数据来源: AIP
摘要:
The brittle fracture surfaces of Ti3Al+Nb and Ti3Al were investigated with a scanning tunneling microscope (STM) under ambient conditions using a mechanically cut platinum iridium alloy wire and electrochemically etched tungsten tips. The results show that the fracture surfaces consist of cleavage steps with dimensions of the order of ∼2 nm for Ti3Al+Nb and ∼60 nm for Ti3Al, 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 Ti3Al+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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