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Relating Nanostructures to Mechanical Properties in Ion-Implanted Materials

Published online by Cambridge University Press:  17 March 2011

David M. Follstaedt ,
James A. Knapp ,
Samuel M. Myers  and
Gary A. Petersen
David M. Follstaedt
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1056
James A. Knapp
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1056
Samuel M. Myers
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1056
Gary A. Petersen
Affiliation:
Sandia National Laboratories, Albuquerque, NM 87185-1056
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Abstract

Ion implantation was used to form high densities (~1019 /cm3) of small oxide precipitates in Ni in order to investigate the strength mechanism produced by such highly refined structures. Nanometer-size precipitates of Al2O3 and NiO are found to block dislocation motion in the Ni matrix, producing yield strengths up to 4.6 GPa, more than twice that of hardened bearing steel. Dispersion strengthening theory, developed for micrometer-size precipitates and spacings, was found to account quantitatively for the yield strengths produced by nanometer-size oxides as well. Nanoindentation plus finite-element modeling was used to quantify the mechanical properties of implanted metal layers, and was extended to examination of amorphous Si layers formed by self-ion implantation. The amorphous phase was found to have a yield strength of 4.45 ± 0.20 GPa, Young's modulus of 144 ± 7 GPa, and hardness of 10.3 ± 0.4 GPa. The modulus and hardness are reduced by 10% and 15%, respectively, from those of crystalline Si.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 647: Symposium O – Ion Beam Synthesis & Processing of Advanced Materials , 2000 , O9.3
Copyright
Copyright © Materials Research Society 2001

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