Determination of size distribution of Guinier-Preston zones in Al-Ag alloys by small-angle X-ray scattering method

Abstract

Small -angle X -ray scattering met hod recognised to be very useful in the studies of structural problems of materials inhomogeneous in nanoscale . Studies by small-angle X -ray scattering on the Al-Ag alloys are presented. The size distributions of spherical Guinier-Preston zones were calculated using Vonk's and Glatter' s methods. Small- angle X-ray scattering studies were performed on A l-5.0 at. %Ag alloy containing spherical Guinier-Preston zones in the ² -state. For this alloy one can assume that scattering particles are of spherical shape, have unif orm electron density and scatter independently . Moreover, the size distributi ons were calcula ted for A l{ 1.6 at. %Ag alloy containing Guinier{P reston zones in " -state (scattering particles with not unif orm electron density ). Both, Vonk's and Glatter' s, methods gave similar size distributions . Profiles of size distributions for Guinier-Preston zones in " -state are more comple x in comparison to Guinier-Preston zones in ² -state. I t is connected with a complex structure of Guinier-Preston zones in " -state. A modificatio n of the structure mo del of Guinier-Preston zones in " - state is proposed.