Short-range and medium-range order in supercooled liquids of alloys

✍ Scribed by Masato Shimono; Hidehiro Onodera

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 728 KB
• Volume: 449-451
• Category: Article
• ISSN: 0921-5093
• DOI: 10.1016/j.msea.2006.02.380

✦ Synopsis

Relaxation behavior of structural change at the atomic cluster level in supercooled liquids during isothermal annealing processes is investigated for a model alloy system by using molecular dynamics simulations. The simulation results show that the short-range icosahedral order grows with the annealing time. Moreover, the spatial distribution of the icosahedral clusters shows a medium-range order of a few nanometers. This type of geometrical short-range order of icosahedral symmetry is drastically enhanced by alloying components with a large atomic size difference and negative heat of mixing. On the other hand, various types of chemical short-range order grow according to a combination of heats of mixing.