細束X線による多結晶金属の引張塑性変形に関する研究

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The behaviors of typical metals during plastic deformations such as rolling, plastic tension etc. and also during fatigue process have been investigated by utilizing the X-ray microbeam technique. On the other hand, the improvement of microbeam technique has also been attempted. In this study, the total misorientation and micro lattice strain caused by plastic tention were investigated by the X-ray microbeam method in a way different from the reported study. The diffraction patterns were photographed in a normal incidence as well as in oblique incidences, the angle between the specimen normal and the incident beam φ_0 being varied in three steps of 10, 20, 30°. For the sake of comparison, the normal strain ε in the direction of incident beam was kept constant by increasing the axial normal strain for larger values of φ_0. The applied normal strain ε was varied in three steps in succession of 4, 8 and 12% for all incidences. The materials used for the purpose were 0.17% carbon steel and 99 5% aluminium, and for each of these materials three or four typical diffraction arcs were traced at three steps of loading. In a simillar way of keeping the normal strain ε constant, calculations were carried out so as to retain the shear strain γ along the reflecting plane constant (4, 8 and 12%). From the experimental results, the total misorientations and micro lattice strains for these cases were obtained. The experimental and calculated results obtained may be summarized as follows. (1) In case the normal strain ε is kept constant, the total misorientation increases in the larger incident angle φ_0 both with carbon steel and aluminium, while the micro lattice strain remains almost constant with aluminium, contrary to its tendency of increase with carbon steel. (2) In the case of maintaining the shear strain γ constant, there is but little change in the total misorientation with both the materials, but their micro lattice strain decreases slightly in the larger φ_0. (3) The increment of total misorientation ⊿β is mainly influenced by the increment of shear strain ⊿γ with both the materials. On the other hand, the increment of micro lattice strain ⊿(⊿d/d) is primarily effected by the increment of shear strain ⊿γ or the increment of normal strain ⊿ε with carbon steel and aluminium, respectively.
社団法人日本材料学会の論文
1971-01-15

細束X線による多結晶金属の引張塑性変形に関する研究

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