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Relating Nanostructures to Mechanical Properties inIon-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 toinvestigate the strength mechanism produced by such highly refinedstructures. Nanometer-size precipitates of Al2O3 andNiO are found to block dislocation motion in the Ni matrix, producing yieldstrengths up to 4.6 GPa, more than twice that of hardened bearing steel.Dispersion strengthening theory, developed for micrometer-size precipitatesand spacings, was found to account quantitatively for the yield strengthsproduced by nanometer-size oxides as well. Nanoindentation plusfinite-element modeling was used to quantify the mechanical properties ofimplanted metal layers, and was extended to examination of amorphous Silayers formed by self-ion implantation. The amorphous phase was found tohave 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.

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