Grain Boundary Diffusion and Linear and Non-Linear Segregation of Ag in Cu |
| |
Authors: | Sergiy Divinski Maik Lohmann Christian Herzig |
| |
Institution: | (1) Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany |
| |
Abstract: | Ag grain boundary (GB) diffusion was measured in the Cu-0.2at%Ag alloy in a wide temperature range from 473 to 970 K. The direct measurements of Ag GB diffusivity D
alloy
gb under conditions of the Harrison C regime revealed that D
alloy
gb is almost identical to D
pure
gb determined earlier for Ag diffusion in high-purity Cu (Divinski, Lohmann, and Herzig, 2001). The penetration profiles determined in the Harrison B regime showed a complex, multi-stage shape. This diffusion behavior can be rationalized assuming that besides GBs significantly covered by segregated Ag atoms, some fraction of GBs remains almost free from Ag atoms in the studied temperature interval. The total amount of pure GBs drastically decreases with decreasing temperature. This hypothesis was proven by measurements of Ag GB diffusion in Cu near 5 bicrystals, which allowed us to analyze in detail the non-linear segregation of Ag in Cu GBs. |
| |
Keywords: | Cu Cu(Ag) alloy grain boundary diffusion grain boundary segregation non-linear segregation |
本文献已被 SpringerLink 等数据库收录! |
|