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Microsegregation of an Aluminum and Magnesium Alloy at High Solidification Rates

Published online by Cambridge University Press:  15 February 2011

L.J. Masur ,
J.T. Burke ,
T.Z. Kattamis  and
M.C. Flemings
L.J. Masur
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts
J.T. Burke
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts
T.Z. Kattamis
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts
M.C. Flemings
Affiliation:
Massachusetts Institute of Technology, Cambridge, Massachusetts
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Abstract

Results are presented of an on-going study of structure and solute redistribution in ribbon cast Al-Cu and Mg-Zn alloys. Regions found in these ribbons are (1) an apparently chemically homogeneous coarse-grained zone adjacent the chill, (2) a transition cellular region, and (3) a dendritic zone, usually equiaxed. In both alloys, structure in the equiaxed region becomes coarser with increasing distance from the chill. In Mg-Zn alloys, the amount of nonequilibrium second phase increases essentially linearly with distance in the cellular and dendritic regions. Scanning transmission electron microscopy can accurately measure solute distribution across rapidly solidified cells or dendrites, but the possibility of surface compositional changes during specimen preparation must be recognized.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 8 , 1981 , 185
Copyright
Copyright © Materials Research Society 1982

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References

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