Profile analysis of diffraction lines of Fe-13.7Cr-24.3Ni-1.9Ti-1.3Mo alloy

Profiles of diffraction lines using Toraya procedure for heat-treated, solid samples of polycrystalline, austenitic Fe-13.7Cr-24.3Ni-1.9Ti-1.3Mo alloy were analysed. Toraya procedure enables the fitting of both individual diffraction lines and the whole powder pattern. Contrary to the results obtained by Toraya for α-SiO2 powder material a complex dependence of the values of particular profile parameters of diffraction lines on the diffraction angle 2Θ was found. This is connected with the specific nature of the solid, austenitic alloy. The values of lattice constants estimated with the use of 2Θ extrapolation function basing on the diffraction line on the positions determined by individual diffraction line fitting were compared with the ones determined by the whole powder pattern fitting procedure and by the Rietveld method. Good agreement between the values of lattice constants determined using the extrapolation function and the Rietveld method was found. (author)