Effect of Grain Boundary Segregation on Shear Deformation of Nanocrystalline Binary Aluminum Alloys at Room Temperature

Abstract:

The paper studies deformation mechanisms of nanocrystalline (NC) pure Al and its binary alloys with various distributions of an alloying element which can be Co or Mg via molecular dynamics simulations. It is revealed that a shear deformation of the pure Al is associated with the grain boundary sliding (GBS) and their simultaneous migration. Mg atoms in grain boundaries (GBs) of an Al-Mg alloy lead to GBS which does not accompany with a grain growth, while the deformation process of the corresponding alloy with a random distribution of Mg is close to that for the pure Al. Unlike Mg, GB segregations of Co atoms detain both GBS and GB migration and result in high strength of an Al-Co alloy. On the contrary, the strength of the alloy with the Co atoms distributed randomly is very low due to the structure amorphisation leading to the ease of plastic flow.

• Periodical: Materials Science Forum (Volumes 838-839)
• Pages: 89-94
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.838-839.89
• Online since: January 2016
• Authors: Rita Babicheva*, Sergey V. Dmitriev, Ying Zhang, Shaw Wei Kok, Kun Zhou
• Keywords: Grain Boundary Sliding, Grain Growth, Molecular Dynamics, Nanocrystalline Aluminum

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