Al-Zn-Mg-Cu系合金の析出強化メカニズムに対する理論的検討

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The main strengthening mechanisms for Al-Zn-Mg-Cu system alloys include the solid solution and precipitation. In this study, we evaluated tensile properties of the 7475 aluminum alloy whose grain size was changed, and discussed the mechanisms of solid solution and precipitation strengthening on the 0.2% proof stress. In this paper, we discuss the precipitation mechanism based on accompanying theories. The main results obtained were as follows : (1) The precipitate particle, η'-MgZn_2 phase dispersed in the aluminum matrix was investigated by use of the transmission electron microscope. The average radius and the center to center spacing of the η'phase were 3.1 and 10.5nm, respectively. As a result, the volume fraction of the η'phase was 10.8% after heat treatment. (2) The precipitation strengthening was estimated from the cut-through mechanism proposed by Brown and Ham. As a result, the energy for the deformation of the interface was 106 mJ/m^2. (3) The relationship between the dispersion appearance of particles and the precipitation strengthening was estimated using the cut-through mechanism proposed by Gerold and Haberkorn. In this material, the experimental result of the precipitation strengthening agreed with the theoretical one. Furthermore, this theory was effective in estimating the precipitation strengthening of the fine particles. (4) The Orowan mechanism did not applied to the fine particle, η'phase, in the 7475 aluminum alloy.
社団法人日本機械学会の論文
1997-09-25

Al-Zn-Mg-Cu系合金の析出強化メカニズムに対する理論的検討

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