On the Tensile Deformation of Aluminum Bicrystals with Σ7 Coincidence Boundary

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  • Σ7対応粒界を有するアルミニウム双結晶の引張変形
  • 7 タイオウ リュウカイ オ ユウスル アルミニウム ソウケッショウ ノ ヒッ
  • On the Tensile Deformation of Aluminum Bicrystals with Σ7 Coincidence Boundary

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Abstract

Tensile properties of aluminum bicrystals with Σ7 coincidence boundary and the corresponding “pseudo-bicrystals” (component single crystals strained in parallel) were compared.<BR>It has been confirmed that the presence of crystal boundary promotes the deformation of the bicrystal under the following conditions:<BR>(1) The crystal boundary acts as the dislocation source.<BR>(2) The value of Nij between the primary slip systems of two component crystals is large.<BR>(3) The compatibility between the adjoing crystals is good.<BR>(4) The forces between the dislocations on the primary slip systems of crystal A and B pull each other, so that the crystal boundary acts as dislocation sink.<BR>(5) The interaction between the dislocations on different slip systems near a crystal boundary may soften either or both of the two crystals. For example, by its mutual action the formation of Lomer-Cottrell sessile dislocations may be disturbed.<BR>The relation between strain and the boundary strength (the increase of the strength of bicrystal by the presence of boundary) was obtained. The maximum value obtained was about 400 g/mm2 at 5×10−2 strain in the specimen Type 3.<BR>It was concluded that the long range stress field by the wall of parallel screw dislocations either attractive or repulsive to the approaching screw dislocations contributed to the boundary strength.<BR>The plastic deformation was affected by the newly created dislocation network in the boundary as well as by the structure of the existing boundary.

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