【2022年1月締切】CiNii ArticlesへのCiNii Researchへの統合に伴う機関認証の移行確認について

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On the Interaction between Dislocations and Decomposition Products in an Al-4% Cu Alloy

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The temperature dependence of critical shear stress and the behavior of work-hardening in stress-strain curves were investigated in single crystals of an aluminium-4 wt. % copper alloy, which were hardened by G-P (1) zones, G-P (2) zones or θ' precipitates. Also dislocation structures after deformation were observed by a transmission electron microscope in specimens with θ' precipitates. From the results of these experiments, the interaction of dislocations with each of decomposition products was discussed as follows. (i) The condition that determines whether or not a dislocation can pass through a decomposition product can be described in terms of the strength of the decomposition product ; it is concluded that a dislocation passes through G-P (1) zones and G-P (2) zones under critical shear stress. (ii) The temperature dependence of critical shear stress in specimens with G-P (1) zones and G-P (2) zones can be explained by an effect that the force required for a dislocation to cut into a zone is larger than that required to move the dislocation within the zone. (iii) A mechanism that a dislocation can pass through a θ' precipitate under suitable conditions is proposed. On this model, the features of stress-strain curves of specimens with θ' precipitates, and the dislocation structures in deformed specimens are explained.

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