Abstract
High purity iron sheets with and without cold rolling are implanted using two methods of high dose nitrogen ions: (1) single-implantation accelerated to 150 keV, and (2) multi-implantation accelerated to a series of voltages of 100, 150 and 200 keV. The iron nitride formed at the iron surface was studied by Auger electron spectroscopy, the grazing incident X-ray diffraction method with incident angles ranging from 1 ° to 10 ° and transmission electron microscopy. Fe 16N 2 was formed with high density in the iron sheet by multi-implantation than by the single accelerated voltage, Lattice ratio ( c/a) of tetragonal crystal of Fe 16N 2 increased to about 1.1 with an aging treatment at 393 K after the implantation. Highly dense Fe 16N 2 particles were formed at cold rolled and aged Fe sheets.
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