Determination of effect of hydrogen on strength of aluminum by MD simulation


Tigli A., Sahin H., Dizdar K. C. , Dışpınar D.

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING, vol.128, no.9, 2022 (SCI-Expanded) identifier

  • Publication Type: Article / Article
  • Volume: 128 Issue: 9
  • Publication Date: 2022
  • Doi Number: 10.1007/s00339-022-05981-4
  • Journal Name: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Academic Search Premier, Aerospace Database, Chemical Abstracts Core, Chimica, Communication Abstracts, Compendex, INSPEC, Metadex
  • Keywords: Molecular dynamic, Hydrogen effect, Dislocation density, Grain effect, Diffusion, REDUCED PRESSURE TEST, OXIDE-FILM DEFECTS, MECHANICAL-PROPERTIES, COMMERCIAL PURITY, POROSITY, FRACTURE
  • Istanbul Technical University Affiliated: Yes

Abstract

The determination of types of defects that may be present in aluminum alloys has been a long-going discussion. Porosity has been held responsible for many of the failures in cast aluminum alloys. Due to the dramatic decrease in the solubility of hydrogen from liquid to solid aluminum, hydrogen is believed to be released from the solidification front and nucleate to form porosity. In this work, the diffusivity of hydrogen at different temperatures were investigated by means of Molecular Dynamic (MD) simulations. Dislocation density, crystal lattice deformation, and related changes in the tensile properties were determined in the presence of hydrogen for mono and nanocrystalline aluminum structures. The findings were correlated with the experimental and simulation data found in the literature where different tensile results were reported at different casting conditions.