Journal
ACTA MATERIALIA
Volume 57, Issue 10, Pages 3012-3019Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2009.03.007
Keywords
Molecular dynamics; Severe plastic deformation; Forced mixing; Mechanical alloying
Funding
- US Department of Energy, Basic Energy Sciences [DEFG02-05ER46217]
- US DOE National Nuclear Security Administration [DEFG52-06NA26153]
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The forced chemical mixing of atoms in model immiscible alloys during severe plastic deformation (SPD) has been investigated as a function of temperature and the heat of mixing using molecular dynamics computer simulations. At low temperatures, A(75)B(25) alloys form solid solutions during SPD for heats of mixing less than similar to 20 kJ mol(-1), but tend to phase separate at larger values. At high temperatures these alloys show more extensive precipitation, with the precipitate morphology dependent on the heat of mixing. Analysis of the high-temperature mixing kinetics reveals that the precipitation process involves two separate mechanisms. The first derives from long-range diffusion mediated by shear-induced vacancies, while the second is due to local rearrangements of atoms induced by the forced mixing of atoms. (C) 2009 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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