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Characterizing the Microstructure and Strengthening Mechanisms in Cryomilled Al 5083

Published online by Cambridge University Press:  01 February 2011

G. Lucadamo ,
N.Y.C. Yang ,
C. SanMarchi  and
E. J. Lavernia
G. Lucadamo
Affiliation:
Materials and Engineering Sciences Center, Sandia National Laboratories, Livermore, CA 94551-0969
N.Y.C. Yang
Affiliation:
Materials and Engineering Sciences Center, Sandia National Laboratories, Livermore, CA 94551-0969
C. SanMarchi
Affiliation:
Materials and Engineering Sciences Center, Sandia National Laboratories, Livermore, CA 94551-0969
E. J. Lavernia
Affiliation:
Department of Materials Science and Engineering, UC Davis, Davis, CA
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Abstract

Cryomilling is a method of producing nanostructured morphologies from a range of starting metals and alloys. This process substantially increases the strength of lightweight alloys. In this work, we characterize the microstructure of Al alloy 5083 following cryomilling, hot isostatic pressing (HIP), and extrusion. The yield strength of the cryomilled 5083 Al is approximately twice that of conventional wrought 5083 Al and the room temperature microhardness essentially is unchanged following annealing at temperatures that approach 0.8 Tm. Using complementary transmission electron microscopy (TEM) techniques such as energy filtered (EFTEM) and weak beam imaging we investigate the mechanisms responsible for the mechanical properties. A survey of the microstructure identifies several sources of strengthening. These include: submicron grain sizes in the as-extruded material, precipitates, and metal-oxide phases. Also, the Mg in the alloy is expected to contribute some solid solution strengthening. TEM images show that lattice dislocations frequently are pinned at the precipitate interfaces. Continued precipitation and grain boundary pinning by oxide particles at elevated temperatures may account for the persistence of hardness following annealing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 882: Symposium EE – Linking Length Scales in the Mechanical Behavior of Materials , 2005 , EE5.2
Copyright
Copyright © Materials Research Society 2005

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