Fe-Mn-Al-C austenitic lightweight steel will precipitate kappa carbides after aging treatment. It is well known that kappa carbides have L12 crystal structure and are coherent with the matrix. Currently, most literature suggests that kappa carbides are generated through spinodal decomposition, which depends on the uphill diffusion of solute atoms. Is spinodal decomposition affected by dislocation density? Or, should the precipitation behavior of ordered kappa carbides be consistent between samples undergoing large plastic deformation and those without deformation? Does the size and volume fraction of kappa carbides remain unchanged?
Of course, the presence of dislocations in an alloy can make it thermodynamically unstable with respect to phase transitions in it. If these dislocations create sufficient internal stresses in the material. Therefore, an alloy that is stable in the absence of internal stresses can release a new phase when they appear in the crystal lattice. The concentration of elements in such a phase and its size depend on the value of the thermodynamic Gibbs potential, which includes the elastic energy of the dislocation ensemble.
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