Extreme Precipitation Strengthening in Ion-Implanted Nickel

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Precipitation strengthening of nickel was investigated using ion-implantation alloying and nanoindentation testing for particle separations in the nanometer range and volume fractions extending above 10O/O. Ion implantation of either oxygen alone or oxygen plus aluminum at room temperature was shown to produce substantial strengthening in the ion-treated layer, with yield strengths near 5 GPa in both cases. After annealing to 550"C the oxygen-alone layer loses much of the benefit, with its yield strength reduced to 1.2 GP~ but the dual ion-implanted layer retains a substantially enhanced yield strength of over 4 GPa. Examination by transmission electron f microscopy showed very ... continued below

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29 Pages

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Follstaedt, D.M.; Knapp, J.A.; Myers, S.M. & Petersen, G.A. May 3, 1999.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Laboratories (SNL), Albuquerque, NM, and Livermore, CA
    Place of Publication: Albuquerque, New Mexico

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Precipitation strengthening of nickel was investigated using ion-implantation alloying and nanoindentation testing for particle separations in the nanometer range and volume fractions extending above 10O/O. Ion implantation of either oxygen alone or oxygen plus aluminum at room temperature was shown to produce substantial strengthening in the ion-treated layer, with yield strengths near 5 GPa in both cases. After annealing to 550"C the oxygen-alone layer loses much of the benefit, with its yield strength reduced to 1.2 GP~ but the dual ion-implanted layer retains a substantially enhanced yield strength of over 4 GPa. Examination by transmission electron f microscopy showed very fine dispersions of 1-5 nm diameter NiO and y-A1203 precipitates in the implanted layers before annealing. The heat treatment at 550"C induced ripening of the NiO particles to sizes ranging from 7 to 20 nm, whereas the more stable ~-A1203 precipitates were little changed. The extreme strengthening we observe is in semiquantitative agreement with predictions based on the application of dispersion-hardening theory to these microstructure.

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29 Pages

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  • Journal Name: Journal of Applied Physics

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  • Other: DE00007034
  • Report No.: SAND99-1107J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 7034
  • Archival Resource Key: ark:/67531/metadc706083

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Office of Scientific & Technical Information Technical Reports

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  • May 3, 1999

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • Dec. 7, 2016, 11:24 a.m.

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Follstaedt, D.M.; Knapp, J.A.; Myers, S.M. & Petersen, G.A. Extreme Precipitation Strengthening in Ion-Implanted Nickel, article, May 3, 1999; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc706083/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.