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Molecular Dynamics Simulations on Nanocomposites Formed by Intermetallic Dispersoids of L12 Type and Aluminum Matrices

Published online by Cambridge University Press:  11 February 2011

Min Namkung ,
Sun Mok Paik  and
Buzz Wincheski
Min Namkung
Affiliation:
NASA Langley Research Center Hampton, VA 23681
Sun Mok Paik
Affiliation:
Kangwon National University, Chunchun, Korea
Buzz Wincheski
Affiliation:
NASA Langley Research Center Hampton, VA 23681
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Abstract

Molecular dynamics simulations were performed to characterize the lattice morphology in the region adjacent to the interfaces in nanocomposite systems of a Ni3Al dispersoid embedded in Al matrix (Ni3Al/Al) and an Al3Nb dispersoid embedded in aluminum matrix (Al3Nb/Al). A nearly perfect coherent interface is obtained in the Al3Nb/Al system with the lattice planes of dispersoid and matrix aligned parallel in all directions. The simulation results show the presence of the matrix atom-depleted regions near the dispersoid boundary for most cases. Detailed analysis revealed that certain sites immediately next to the dispersoid are energetically favored for the matrix atoms to occupy. The matrix atoms occupying these sites attract other atoms producing the depleted regions. In certain specific situations of Al3Nb/Al system, however, the wetting of a rotated dispersoid is overwhelmingly complete prompting the need of further study for better understanding. The order parameters of dispersoids calculated for Ni3Al in aluminum is nearly constant while that for Al3Nb in aluminum is rapidly decreasing function of temperature in the range of 300 to 1800K.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 740: Symposium I – Nanomaterials for Structural Applications , 2002 , I7.20
Copyright
Copyright © Materials Research Society 2003

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References

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