A. Yamamoto et al., EFFECTS OF ION-IMPLANTATION WITH NITROGEN ION ON MICROSTRUCTURES IN DEFORMED IRON, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 121(1-4), 1997, pp. 275-278
The implantation with nitrogen ions accelerated at 150 kV has been per
formed on sheets of high purity iron (99.99%) annealed for 1.8 ks at 7
73 K and/or cold-rolled with 90% reduction. Dose of the ions was chang
ed in the range of 8 x 10(18) to 4 x 10(20) N-2(+)/m(2). Hardness incr
eased for a wide range in depth and its increment is large in the defo
rmed specimen compared with the annealed and implanted specimen. Iron
nitride, Fe16N2 (alpha ''), is formed in both the deformed and the ann
ealed specimens, and the size of alpha '' particle in the former is sm
aller than that in the latter. The formation of alpha '' in the deform
ed specimen is accompanied by the disappearance of dislocation substru
ctures.