Surface Hardening by Nanoparticle Precipitation in Ni(Al,O)

Technical Report · Sat Mar 31 23:00:00 EST 2001

DOI:https://doi.org/10.2172/780314· OSTI ID:780314

MYERS, Jr, SAMUEL M ^[1]; FOLLSTAEDT, DAVID M; KNAPP, JAMES A

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1. Sandia National Laboratories

Ion implantation of O and Al were used to form nanometer-size precipitates of NiO or Al{sub 2}O{sub 3} in the near-surface of Ni. The yield strengths of the treated layers were determined by nanoindentation testing in conjunction with finite-element modeling. The strengths range up to {approximately}5 GPa, substantially above values for hard bearing steels. These results agree quantitatively with predictions of dispersion-hardening theory based on the precipitate microstructures observed by transmission electron microscopy. Such surface hardening by ion implantation may be beneficial for Ni components in micro-electromechanical systems.

• Research Organization: Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 780314
• Report Number(s): SAND2001-0912
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BEARINGS
DISPERSION HARDENING
ION IMPLANTATION
PRECIPITATION
STEELS
SURFACE HARDENING
TESTING
TRANSMISSION ELECTRON MICROSCOPY
YIELD STRENGTH