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

MYERS, SAMUEL M. Jr. ; FOLLSTAEDT, DAVID M. ; KNAPP, JAMES A.

Sandia National Laboratories

关键词: Testing;    Surface Hardening;    Ion Implantation;    Bearings;    Dispersion Hardening;   

DOI  :  10.2172/780314
RP-ID  :  SAND2001-0912
RP-ID  :  AC04-94AL85000
RP-ID  :  780314

美国|英语

来源: UNT Digital Library

【 摘 要 】

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.