Crystalline phase transitions produced by ion implantation

Abstract
Ion implantation has been used to produce crystalline phase transitions in nickel and 316 stainless steel. Doses of ∼1016 to 1017 ions·cm−2 of 40keV P+ at room temperature resulted in an f.c.c. to h.c.p. transition in nickel and an f.c.c. to b.c.c. transition in stainless steel. The orientation relationships between the two phases have been determined. It is suggested that stresses, produced in the implanted layer, are the origin of the observed transitions.