Loading...

Molecular Dynamics Study of Tungsten and Iron Addition on the Glass Formability of Cobalt-based Electrodeposited Coatings

Bayati, Mohammad Baher | 2018

2043 Viewed
  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 51548 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Tavakoli, Rouhollah
  7. Abstract:
  8. Recent research suggests that the electrochemical deposition of cobalt-based binary alloys, such as cobalt-tungsten and cobalt-iron, can lead to the formation of amorphous structures in the coatings. Theoretical studies suggest that these structures are equivalent to structures created by the melt cooling of the alloy at speeds of about 〖10〗^10 Kelvin per second. The formation of a glass phase can significantly increase the abrasion resistance and corrosion resistance of these coatings. Empirical studies show that the ability of the glass to become glassy, or more precisely, the transition from crystalline to amorphous, is largely a function of the chemical composition. Simulation of molecular dynamics is one of the most powerful tools for studying order in non-crystalline structures and quantifying the structural ability of the structure. Recent research shows that the formation of local structures with short-range order with 5th-grade rotation axes, the local icosahedral structures, is closely related to the ability of the glass to form amorphous alloys. The purpose of this study was to investigate the effect of adding iron and tungsten on the glassiness and formation of low-order localized structures in cobalt-based binary and tritium alloys. For this purpose, the potential for the modeling of the interactions of atoms in this family of alloys is firstly developed. The prediction of these alloys has been predicted by the simulation of the molecular dynamics of the atomic layout. Ultimately, with the aid of Veronoy's analysis of the structures, the ability of the glass to be coated is studied quantitatively
  9. Keywords:
  10. Glass Forming Ability ; Bulk Metallic Glass ; Molecular Dynamic Simulation ; Voronoi Analysis ; Voronoi Index ; Cobalt Base Superalloy

 Digital Object List

 Bookmark

...see more