VOID SWELLING IN FE-15CR-XNI TERNARY ALLOYS UNDER PROTON IRRADIATION

Void swelling and microstructure in Fe-15Cr-xNi (x = 20, 25, 30 wt%) t ernary alloys irradiated with 180 keV protons at 723-873 K (450-600 de grees C) were examined by TEM, The displacement damage levels were 5-2 0 dpa for the alloys preinjected with 10 appm He at room temperature, and 5 dpa for the alloys without He. The introduced H seems to play th e same role as He in enhancing void nucleation at the lower temperatur es (723, 773 K). Although the preinjected He can suppress the Ni-depen dent incubation close at all the irradiation temperatures examined, th e Ni-dependent swelling rate may be responsible for the Ni influence o n swelling at the higher temperatures (823, 873 K). The turning point of the Ni influence on swelling lies around 823 K in the present proto n irradiation. (C) 1998 Elsevier Science B.V. All rights reserved.