日本金属学会誌

J. Japan Inst. Metals, Vol. 59, No. 10 (1995),
pp. 1013-1017

Influence of Segregation of Elements (P, Bi, Ag) on Nanometer-ScaleGrain-Boundary Sliding in Cu with Boundary Precipitates

Ryoichi Monzen, Masashi Hida and Kazuo Kitagawa

Department of Mechanical Systems Engineering, Kanazawa University, Kanazawa

Abstract:

The effects of segregation of alloying elements (P, Bi and Ag) on the boundary-dependent capability of grain-boundary sliding of various [011] symmetric tilt boundaries in Cu have been investigated below 573 K from experiments using an electron microscope technique. The technique utilizes the sliding-induced rotation of moir´{e} fringes on boundary BCC Fe-Co particles in an aged Cu-Fe-Co alloy and is capable of detecting sliding of less than 1 nm. The viscosity of a boundary increases and then reaches a saturation stage as the amount of segregation of each element increases. At the saturation stage, the activation energies Q for sliding are in agreement with those Qv for the bulk diffusion of the elements in Cu. For boundaries which have values of Q larger than Qv before adding the elements, the boundary viscosity is not affected by the segregation of the elements. These experimental results can be explained qualitatively from the viewpoint of grain-boundary diffusion.


(Received April 17, 1995)

Keywords:

nanometer sliding, boundary segregation, moir´{e} method, copper bicrystals, boundary viscosity, activation energy


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