Effect of particle size and inter-particle spacing on dislocation behaviour of Nickel based super alloys

TL;DR

This paper models how particle size and spacing influence dislocation behavior in Ni-based superalloys, providing insights into their strengthening mechanisms at the atomistic level.

Contribution

It introduces a new model for dislocation-precipitate interactions that clarifies the effects of particle size and spacing on alloy strength.

Findings

Particle size significantly affects dislocation movement.

Inter-particle spacing influences the alloy's strengthening.

Physically meaningful results support the model's validity.

Abstract

Ni-based superalloys have been the subject of enormous usage in scenarios where the loading is heavy and often occurs at elevated temperatures. The strengthening mechanisms that come into play within the metallic lattice have been studied extensively as micromechanical MMC models. These continuum formulations suffer from several limitations. The underlying mechanisms at the atomistic scale have not yet been well understood. The report attempts to model the interaction of moving dislocation with cuboidal precipitates and explain the strengthening effect. The effect of particle size and inter-particle distance on the strength are evaluated. Several physically meaningful results have also been interpreted and shown.