透過ラウエ法によるアルミニウムの変形の研究

抄録

Pure aluminum deformed in tension was studied by the transmission Laue method. The asterism of diffraction spots was expressed in terms of its magnitude and diffracting direction as follows: Let the magnitude Δθ_a be the dispersion of diffration angle, and φ the angle between the load the diffracting directions on a film. The locus of vector (Δθ_a, φ) can be approximated by one or two circles in many cases. These circles represent the directional asterism distributions and the longest vector corresponds to the asterism maximum.
The experimental results obtained were as follows: for coarse grained polycrystalline aluminum, the maximum value of asterism is approximately proportional to the elongation up to a several percent. For both bi-crystal and polycrystal specimens, the asterism maximum vector in a grain oriented in the easy slip direction is large and has the direction along the load direction at the mid point of grain, but it becomes small near the grain boundary. On the other hand, the asterism maximum vector in a grain oriented in the hard slip direction is small at the mid-point of grain, but it becomes large near the grain boundary, with its direction varying differently.