Grain boundary grooving as an indicator of grain boundary phase transformations

被引：77
作者：
Schölhammer, J
Baretzky, B
Gust, W
Mittemeijer, E
Straumal, B
机构：
[1] Max Planck Inst Met Forsch, Inst Metallkunde, D-70174 Stuttgart, Germany
[2] Russian Acad Sci, Inst Solid State Phys, RU-142432 Chernogolovka, Moscow District, Russia
来源：
INTERFACE SCIENCE | 2001年 / 9卷 / 1-2期
关键词：
grain boundaries; thermal groove; segregation; Cu; Bi;
D O I：
10.1023/A:1011266729152
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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(Bi)(v) from 5 to 140 ppm Bi. The transition from monolayer to multilayer adsorption is observed for the Sigma 19a GB at 1123 K and x(Bi)(v) = 60 at. ppm Bi. At the same point (1123 K and x(Bi)(v) = 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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页码：43 / 53
页数：11
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