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Deformation of nanocrystalline binary aluminum alloys with segregation of Mg, Co and Ti at grain boundaries

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Zinovev, Aleksandr [UCL] Bapanina, M. G. [Institute for Metals Superplasticity Problems] Babicheva, R. I. [Institute for Metals Superplasticity Problems] Enikeev, N. A. [Institute of Physics of Advanced Materials] Dmitriev, S. V. [Institute for Metals Superplasticity Problems] Zhou, K. [Nanyang Technological University]

The influence of the temperature and sort of alloying element on the deformation of the nanocrystalline (NC) binary Al alloys with segregation of 10.2 at% Ti, Co, or Mg over grain boundaries has been studied using the molecular dynamics. The deformation behavior of the materials has been studied in detail by the simulation of the shear deformation of various Al bicrystals with the grain-boundary segregation of impurity atoms, namely, Ti, Co, or Mg. The deformation of bicrystals with different grain orientation has been studied. It has been found that Co introduction into grain boundaries of NC Al has a strengthening effect due to the deceleration of the grain-boundary migration (GBM) and difficulty in the grain-boundary sliding (GBS). The Mg segregation at the boundaries greatly impedes the GBM, but stimulates the development of the GBS. In the NC alloy of Al–Ti, the GBM occurs actively, and the flow-stress values are close to the values characteristic of pure Al.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2017
Language Anglais
Journal information "Physics of Metals and Metallography" - Vol. 118, no.1, p. 65-74 (2017)
Peer reviewed yes
Publisher Pleiades Publishing Ltd
issn 0031-918X
e-issn 1555-6190
Publication status Publié
Affiliation UCL - SST/IMMC/MEMA - Applied mechanics and mathematics
Keywords aluminum alloys ; grain-boundary ; grain-boundary sliding ; molecular dynamics ; segregation ; aluminum alloys ; aluminum alloys ; grain-boundary ; grain-boundary sliding ; molecular dynamics ; segregation
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Bibliographic reference Zinovev, Aleksandr ; Bapanina, M. G. ; Babicheva, R. I. ; Enikeev, N. A. ; Dmitriev, S. V. ; et. al. Deformation of nanocrystalline binary aluminum alloys with segregation of Mg, Co and Ti at grain boundaries. In: Physics of Metals and Metallography, Vol. 118, no.1, p. 65-74 (2017)
Permanent URL http://hdl.handle.net/2078.1/201945