Abstract
Cavity formation in an austenitic alloy related to type 316 stainless steel has been explored with regard to various methods of gas implantation. Irradiations were conducted at 900 K to doses of 1, 10, and 70 dpa with helium injection levels of 20 at. ppm/dpa. Highest swelling (18%) was exhibited by the unimplanted reference material; a lesser amount by simultaneous helium injection (11%). Greatly reduced swelling due to profuse cavity nucleation was the result of the preinjection of 1400 at. ppm He, either at room temperature (S = 1%) or at 900 K (4%). The dislocation density was not sensitive to the helium injection technique; however, the evolution of the dislocation structure from faulted loops to network was retarded for the case of RT-preinjection compared with the alternate techniques. Simultaneous injection of 50 at. ppm H/dpa, along with the helium, may have caused a modest increase in the cavity and dislocation concentrations at higher doses.
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