SYMPOSIA PAPER Published: 01 January 1975

Swelling and Irradiation Induced Microstructural Changes in Nickel-Based Alloys


Three nickel alloys, Inconel X750, Inconel 600, and Inconel 625, and a 20 percent cold-worked Type 316 stainless steel were bombarded with 5-MeV nickel ions at 650°C (1202°F) to damage levels up to 90 displacements per atom. Post bombardment examination was carried out using 1-MeV transmission electron microscopy to image the entire range of ion damage. The evolution of the microstructure as a function of depth and displacement damage was determined by stereo microscopy. Despite variations in base composition and initial microstructure the three nickel alloys behaved in a similar fashion and exhibited an order of magnitude less swelling than the Type 316 stainless steel. In Inconel X750 containing a dispersion of γ′, loss of coherency of the γ′ particles occurred at very low doses at 550, 600, and 650°C (1022, 1112, and 1202°F). At 600 and 650°C the irradiation induced loop structure was controlled by the initial distribution of γ′, and further precipitation of fine γ′ occurred in the rest of the matrix.

Author Information

Rowcliffe, AF
Oak Ridge National Laboratory, Oak Ridge, Tenn.
Diamond, S
, Madison, Pa.
Bleiberg, ML
, Madison, Pa.
Spitznagel, J
Westinghouse Research Laboratories, Pittsburgh, Pa.
Choyke, J
Westinghouse Research Laboratories, Pittsburgh, Pa.
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Developed by Committee: E10
Pages: 565–583
DOI: 10.1520/STP33715S
ISBN-EB: 978-0-8031-4653-2
ISBN-13: 978-0-8031-0539-3