Abstract
X-ray diffuse scatterings around the direct beam (i.e. X-ray small angle scattering) and around the Bragg angles of (111) and (200), were measured with powder samples of an Al-10 at% Zn alloy containing G.P. zones.
The diffuse scatterings around the Bragg angles were caused by G.P. zones. Their scattering intensities were strongly dependent on zone-size and their scattering profiles changed from symmetrical to asymmetrical around the Bragg angle with increasing zone-size from RG=31Å to 52Å (RG: Guinier radius). The asymmetrical diffuse scatterings were interpretable as being due to the size effect scatterings which reflect the static displacement of atoms from the lattice points (i.e. static distortion). The size effect scatterings became more intensive with the zone size.
