Effects of composition on atomic structure, diffusivity, and viscosity of liquid Al-Zr alloys

William Yi Wang, Shun Li Shang, Hua Zhi Fang, Hui Zhang, Yi Wang, Suveen Nigel Mathaudhu, Xi Dong Hui, Zi Kui Liu

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Abstract

The diffusion coefficients and viscosity of four Al 1-xZr x (x = 0.4, 0.5. 0.6, and 0.67) alloys are predicted by ab initio molecular dynamic simulations via the Einstein and Darken equations. It is observed that the addition of Zr to Al reduces the self-diffusion coefficient of Al drastically, whereas the addition of Al to Zr has little effect on the self-diffusion coefficient of Zr. The interdiffusion coefficient and viscosity are predicted with both being close to those of pure Al extrapolated to high temperatures. Based on the analysis of atomic structures, the observations are attributed to clustering in liquid so that the migration of Al and Zr are correlated strongly and viscous flow is affected by Al-Al bonding between clusters.

Original languageEnglish (US)
Pages (from-to)3471-3480
Number of pages10
JournalMetallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume43
Issue number10
DOIs
Publication statusPublished - Oct 1 2012

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All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys

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