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Title: A study on atomic diffusion behaviours in an Al-Mg compound casting process

Al and Mg alloys are main lightweight alloys of research interest and they both have superb material properties, i.e., low density and high specific strength, etc. Being different from Al alloys, the corrosion of Mg alloys is much more difficult to control. Therefore to combine merits of these two lightweight alloys as a composite-like structure is an ideal solution through using Al alloys as a protective layer for Mg alloys. Compound casting is a realistic technique to manufacture such a bi-metal structure. In this study, a compound casting technique is employed to fabricate bi-layered samples using Al and Mg and then the samples are analysed using electron probe micro-analyzer (EPMA) to determine diffusion behaviours between Al and Mg. The diffusion mechanism and behaviours between Al and Mg are studied numerically at atomic scale using molecular dynamics (MD) and parametric studies are conducted to find out influences of ambient temperature and pressure on the diffusion behaviours between Al and Mg. The results obtained clearly show the effectiveness of the compound casting process to increase the diffusion between Al and Mg and thus create the Al-base protection layer for Mg.
Authors:
;  [1] ;  [2] ;  [3]
  1. School of Material and Engineering, Hefei University of Technology, Hefei 230009 (China)
  2. School of Computing, Engineering and Mathematics, University of Western Sydney, Penrith, NSW 2751 (Australia)
  3. (Australia)
Publication Date:
OSTI Identifier:
22492318
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 8; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM ALLOYS; AMBIENT TEMPERATURE; CASTING; CORROSION; DENSITY; DIFFUSION; ELECTRON MICROPROBE ANALYSIS; ELECTRON PROBES; IMPACT STRENGTH; LAYERS; MAGNESIUM ALLOYS; MOLECULAR DYNAMICS METHOD; PARAMETRIC ANALYSIS