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Strengthening of Aluminum by Oxygen Implantation: Experimental Results and Mechanical Modeling

Published online by Cambridge University Press:  25 February 2011

Roy J. Bourcier ,
David M. Follstaedt ,
Samuel M. Myers  and
Douglas H. Polonis
Roy J. Bourcier
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
David M. Follstaedt
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
Samuel M. Myers
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185, U.S.A.
Douglas H. Polonis
Affiliation:
University of Washington, Seattle, WA 98195, U.S.A.
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Abstract

The microstructuTe and mechanical properties of high purity aluminum implanted with 20 at.% oxygen to a depth of roughly 500 nm and subjected to various thermal histories have been examined. Transmission electron microscopy and Rutherford-backscattering spectrometry were used to characterize the depth and nature of the implanted zone. As implanted, the material appears to contain a homogeneous distribution of disordered precipitates with sizes of 1.5-3.5 nm. Annealing at 450 or 550ΰC for 1 hour, induces ordering of the precipitates but only causes slight coarsening. Ultra-low load indentation hardness testing was used to probe the mechanical response of the surface-modified material. The data from the hardness tests were interpreted through the use of a finite-element model; the results indicate the flow stresses of an implanted and annealed layer are as high as 1600 MPa. The as-implanted material is much harder, approaching 3300 MPa. The degree of strengthening expected for the as-implanted and post-annealed material on the basis of the observed microstructure was estimated using several micromechanical models, and the results conform to the findings from indentation testing.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 157: Symposium A – Beam-Solid Interactions: Physical Phenomena , 1989 , 801
Copyright
Copyright © Materials Research Society 1990

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References

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