Elastic strain energy control of the precipitate free zone around primary carbides in nickel base alloy 725
Source abstract
Abstract
Abstract Precipitate free zones (PFZs) are commonly believed to be controlled by either vacancy or solute depletion around sinks. This study shows that the PFZ around primary carbides (Nb, Ti)C is also influenced by stress field in alloy 725, which is a nickel base alloy hardened by γ″ precipitates. Finite element simulation suggests that the interaction energy between the local stress induced by primary carbides and the transformation strain of γ″ cause a bias in their nucleation. These observations show that in addition to diffusion, internal stress can significantly influence the nucleation of precipitates around sinks.
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Research context
OpenAlex topics: High Temperature Alloys and Creep · Microstructure and Mechanical Properties of Steels · Microstructure and mechanical properties
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