Authors: T Steiner M Akhlaghi S R Meka E J Mittemeijer
Publish Date: 2015/07/21
Volume: 50, Issue: 21, Pages: 7075-7086
Abstract
The initial precipitation of misfitting particles can be accompanied by elastic accommodation of the precipitate/matrix misfit leading to considerable matrix lattice dilatation/contraction and variable lattice microstrain In this stage the entire assembly of matrix and precipitate particles as a whole can diffract coherently Upon aging of the system relaxation of the accommodated misfit can occur by continuous and/or discontinuous coarsening of the precipitates These processes are associated with distinctly different characteristic diffraction phenomena also involving a transition from coherent to incoherent diffraction of precipitates and matrix For the case of initially fully coherent alloying element nitrides in a homogeneously nitrided ferrite matrix these effects have been identified and analyzed thus allowing tracing of misfitrelaxation processesThe authors would like to thank Dr E Bischoff for the TEM investigations Mr WD Lang for preparation of the TEM specimens and Mr P Kress for assistance with the nitriding experiments all with Max Planck Institute for Intelligent Systems and Prof A Leineweber now with TU Bergakademie Freiberg for valuable discussion
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