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In-Situ Tem Studies of Recrystallization and Grain Growth in Al-Mg-Mn-Zr Alloys

Published online by Cambridge University Press:  15 February 2011

John S. Vetrano ,
Steve M. Bruemmer  and
Ian M. Robertson
John S. Vetrano
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Steve M. Bruemmer
Affiliation:
Pacific Northwest National Laboratory, Richland, WA 99352
Ian M. Robertson
Affiliation:
Dept. of Materials Science and Engineering, University of Illinois, Urbana, IL 61801
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Abstract

Recrystallization and grain growth studies of Al-Mg-Mn-Zr alloys have been carried out in-situ in the transmission electron microscope. Nucleation sites were primarily on large (>I μm diameter) eutectic constituent particles. The sub-micron A16Mn dispersoids were observed to be effective as nuclei if present in clusters, and were effective at retarding grain boundary migration and dislocation motion. The smaller A13Zr precipitates seemed to have little effect on nucleation and growth, but were effective in pinning dislocations. These results have been analyzed in terms of precipitate size and shape in both the as-cold-worked microstructure and during recrystallization. The implications on the microstructural refinement of these alloys for improved superplastic properties will be discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 404: Symposium J – In Situ Electron and Tunneling Microscopy of Dynamic Processes , 1995 , 177
Copyright
Copyright © Materials Research Society 1996

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