Abstract
The atomic force microscopy (AFM) was used to study the grain boundary (GB) groove profiles far away from the melting temperature T m. It is shown that AFM allows one to measure the temperature dependence of the GB energy in a rather broad temperature interval (from 0.85 T m to T m). The GB energy and GB segregation of Bi were measured at 1123 K in the interval of the Bi bulk concentration x v Bi from 5 to 140 ppm Bi. The transition from monolayer to multilayer adsorption is observed for the Σ19a GB at 1123 K and x v Bi = 60 at. ppm Bi. At the same point (1123 K and x v Bi = 60 at. ppm Bi) a discontinuity of the first derivative of the GB energy is observed. These features were explained using the model of GB prewetting phase transformation developed previously.
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Schölhammer, J., Baretzky, B., Gust, W. et al. Grain Boundary Grooving as an Indicator of Grain Boundary Phase Transformations. Interface Science 9, 43–53 (2001). https://doi.org/10.1023/A:1011266729152
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DOI: https://doi.org/10.1023/A:1011266729152