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Idealized vs. Realistic Microstructures: An Atomistic Simulation Case Study on γ/γ' Microstructures.

Aruna Prakash1, Erik Bitzek2

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Summary
This summary is machine-generated.

Accurate simulation of internal stresses in nickel-base superalloys is crucial for understanding material behavior. Realistic microstructures, informed by experiments, reveal stress states that differ significantly from idealized models, impacting dislocation loop evolution.

Keywords:
Ni-base superalloysatomistic simulationsexperimentally-informed microstructuresfinite element simulationsmisfit stressesperiodic boundary conditionsthermal misfitvirial atomic stressesγ/γ′ microstructure

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Area of Science:

  • Materials Science
  • Computational Materials Science
  • Mechanical Engineering

Background:

  • Single-crystal nickel-base superalloys are vital for high-temperature applications like aircraft turbine blades.
  • Their performance is dictated by the two-phase γ/γ' microstructure and associated internal stresses arising from lattice misfit.
  • Accurate modeling of these misfit stresses is essential for understanding deformation and creep behavior.

Purpose of the Study:

  • To compare internal stresses in idealized versus experimentally-informed γ/γ' microstructures of nickel-base superalloys.
  • To investigate the influence of these stress states on dislocation loop evolution.
  • To validate atomistic simulations against finite element methods.

Main Methods:

  • Generation of idealized (periodic cubes) and experimentally-informed (SEM and APT data) γ/γ' microstructures for atomistic simulations.
  • Finite element simulations of an idealized microstructure with 3D periodic boundary conditions.
  • Analysis of internal stress states and dislocation loop evolution in all generated samples.

Main Results:

  • Atomistic and finite element simulations of idealized microstructures yield nearly identical stress distributions.
  • Experimentally-informed microstructures exhibit distinct stress states compared to idealized models.
  • Quasi-2D boundary conditions result in significantly different stress states and dislocation loop evolution than fully 3D conditions.

Conclusions:

  • The choice of microstructure representation (idealized vs. experimental) critically affects simulated internal stress states.
  • Simulation boundary conditions (2D vs. 3D) profoundly influence stress distribution and subsequent material deformation mechanisms.
  • Accurate modeling requires incorporating realistic microstructural features and appropriate boundary conditions for reliable predictions.