カドミウム双結晶の粒界すべり挙動

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  • Behavior of Grain Boundary Sliding in Cadmium Bicrystals
  • カドミウム ソウケッショウ ノ リュウカイ スベリ キョドウ

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Significant contribution of crystal lattice dislocations to the grain boundary sliding has been suggested by various experiments and theories. However, the difference between the behaviors of grain boundary sliding with and without crystal slip has been rarely reported.<BR>In the present paper, the behaviors of grain boundary sliding are investigated by the use of orientation controlled cadmium bicrystals for the two cases mentioned above.<BR>The rate of grain boundary sliding without crystal slip varies in proportion to the applied stress and is controlled by the grain boundary diffusion. When crystal slip is activated, the grain boundary sliding rate is increased. In such cases, the rate of grain boundary sliding is found to vary in proportion to the square of applied stress, and the activation energy for the grain boundary sliding is almost equal to that of volume diffusion. These results indicate that the mechanism of grain boundary sliding with crystal slip is different from that without crystal slip.<BR>McLeans’ model for the grain boundary sliding with crystal slip is developed by the consideration that the number of dislocations in the grain boundary is proportional to the shear stress on the slip system. It is possible to explain variation of the grain boundary sliding rate accompanying the change in the shear stress on slip systems by this model.

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  • 日本金属学会誌

    日本金属学会誌 46 (8), 755-759, 1982

    公益社団法人 日本金属学会

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