日本金属学会誌

J. Japan Inst. Metals, Vol. 63, No. 9 (1999),
pp. 1224-1228

Misorientation Dependence of Grain-Boundary Diffusion of Bi in Cu Bicrystals

Ryoichi Monzen and Takuya Kuze

Department of Mechanical Systems Engineering, Faculty of Engineering, Kanazawa University, Kanazawa 920-8667

Abstract:

The boundary diffusion of bismuth has been investigated as a function of the misorientation angle, for [001] and [011] twist boundaries and [001] and [011] symmetric tilt boundaries of Cu from observations of intergranularly fractured surfaces of Bi-doped bicrystals. It has been found that the misorientation dependence of the boundary diffusivity of bismuth shows a close correlation with that of the boundary energy. The minimum of the boundary diffusivity occurs where the cusps of the boundary energy exist. The larger degree of disorder in the atomic arrangement at a boundary may result in the higher boundary diffusivity. The diffusion of bismuth in the [011] twist boundaries has also been found to take place more easily than in the [001] twist boundaries.


(Received November 11, 1998; In Final Form July 19, 1999)

Keywords:

bismuth boundary-diffusion, copper bicrystal, [001] and [011] twist boundaries, [001] and [011] symmetric tilt boundaries, boundary energy, boundary free-volume


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