Micromechanical behaviour of Ni-based superalloys close to the yield point: a comparative study between neutron diffraction on different polycrystalline microstructures and crystal plasticity finite element modelling


To investigate the microstructure-dependent relationships in polycrystalline Ni-based superalloys (Haynes 282 and Inconel 718) deformed in the elastoplastic regime, the lattice strain evolution along various macroscopic directions and along various crystallographic directions is monitored via in situ neutron diffraction during uniaxial tensile loading. In addition, a crystal plasticity-based finite element model is set up to describe the micromechanical behaviour of a unit cell within a uniaxially loaded polycrystalline aggregate. Appropriate postprocessing of the (micromechanical) field quantities allows to simulate the diffraction experiment and thus to directly compare and to discuss experimental and modelling results.

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We gratefully acknowledge the DFG for funding this research within projects KR 3687/3-1, HO 3322/3-1 and WA 3676/1-1. In addition, the authors thank the German neutron source FRM II for providing beam time at instruments STRESS-SPEC and SPODI and the instrument scientist M. Hölzel for his support during and after the powder diffraction measurement.

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Correspondence to Jonas von Kobylinski.

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von Kobylinski, J., Lawitzki, R., Hofmann, M. et al. Micromechanical behaviour of Ni-based superalloys close to the yield point: a comparative study between neutron diffraction on different polycrystalline microstructures and crystal plasticity finite element modelling. Continuum Mech. Thermodyn. 31, 691–702 (2019). https://doi.org/10.1007/s00161-018-0720-0

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  • Neutron diffraction
  • Crystal plasticity
  • Nickel-based superalloy
  • In situ tension test