Multiscale analysis of crystal defect formation in rapid solidification of pure aluminium and aluminium-copper alloys - Archive ouverte HAL Access content directly
Preprints, Working Papers, ... Year : 2022

Multiscale analysis of crystal defect formation in rapid solidification of pure aluminium and aluminium-copper alloys

Kais Ammar
Tatu Pinomaa
  • Function : Author
Matti Lindroos
  • Function : Author
Paul Jreidini
  • Function : Author
Matias Haapalehto
  • Function : Author
Lei Wang
  • Function : Author
Samuel Forest
Nikolas Provatas
  • Function : Author
Anssi Laukkanen
  • Function : Author

Abstract

Rapid solidification leads to unique microstructural features, where a less studied topic is the formation of various crystalline defects, including high dislocation densities, as well as gradients and splitting of the crystalline orientation. As these defects critically affect the material's mechanical properties and performance features, it is important to understand the defect formation mechanisms, and how they depend on the solidification conditions and alloying. To illuminate the formation mechanisms of the rapid solidification induced crystalline defects, we conduct a multiscale modeling analysis consisting of bond-order potential based molecular dynamics (MD), phase field crystal based amplitude expansion (PFC-AE) simulations, and sequentially coupled phase field -- crystal plasticity (PF--CP) simulations. The resulting dislocation densities are quantified and compared to past experiments. The atomistic approaches (MD, PFC) can be used to calibrate continuum level crystal plasticity models, and the framework adds mechanistic insights arising from the multiscale analysis.

Dates and versions

hal-03512023 , version 1 (05-01-2022)

Identifiers

Cite

Kais Ammar, Tatu Pinomaa, Matti Lindroos, Paul Jreidini, Matias Haapalehto, et al.. Multiscale analysis of crystal defect formation in rapid solidification of pure aluminium and aluminium-copper alloys. 2022. ⟨hal-03512023⟩
93 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More