AN X-RAY SINGLE CRYSTAL INVESTIGATION OF IRON-RICH ALLOYS OF IRON AND ALUMINUM .2. DIFFUSE SCATTERING MEASUREMENTS OF SHORT-RANGE ORDER IN ALLOYS CONTAINING 14.0-AT.( AND 18.3-AT.( ALUMINUM

The X-ray diffuse scattering from alloy single crystals of Fe-14.0 and Fe-18.3 at. % Al quenched from 850°C has been measured throughout a volume in reciprocal space sufficient to permit the order and atomic displacements modulations to be separated. From these separated components, three-dimensional order and atomic displacements coefficients were determined. The short-range order in the arrangement of the atoms is tending toward the DO3 type arrangement, the ordered structure being more fully developed in the more concentrated alloy. The modulations associated with the atomic displacements are shown to be responsible for many of the characteristic features of the diffuse intensity distributions. © 1969.