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 specimem normal and the incident beam ψ
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 ψ
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 ψ
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 ψ
0.
(3) The increment of total misorientation Δβ is mainly influenced by the increment of shear strain Δγ with both the materials. On the other hand, the increment of micro lattice strain Δ(Δ
d/d) is primarily effected by the increment of shear strain Δγ or the increment of normal strain Δε with carbon steel and aluminium, respectively.
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