The Role of Grain Size on Neutron Irradiation Response of Nanocrystalline Copper

Mohamed, Walid; Miller, Brandon; Porter, Douglas; Murty, Korukonda

doi:10.3390/ma9030144

The Role of Grain Size on Neutron Irradiation Response of Nanocrystalline Copper

Journal Article · Tue Mar 01 00:00:00 EST 2016 · Materials

DOI:https://doi.org/10.3390/ma9030144· OSTI ID:1628450

Mohamed, Walid ^[1]; Miller, Brandon ^[2]; Porter, Douglas ^[2]; Murty, Korukonda ^[3]

North Carolina State Univ., Raleigh, NC (United States); DOE/OSTI
Idaho National Lab. (INL), Idaho Falls, ID (United States)
North Carolina State Univ., Raleigh, NC (United States)

The role of grain size on the developed microstructure and mechanical properties of neutron irradiated nanocrystalline copper was investigated by comparing the radiation response of material to the conventional micrograined counterpart. Nanocrystalline (nc) and micrograined (MG) copper samples were subjected to a range of neutron exposure levels from 0.0034 to 2 dpa. At all damage levels, the response of MG-copper was governed by radiation hardening manifested by an increase in strength with accompanying ductility loss. Conversely, the response of nc-copper to neutron irradiation exhibited a dependence on the damage level. At low damage levels, grain growth was the primary response, with radiation hardening and embrittlement becoming the dominant responses with increasing damage levels. Annealing experiments revealed that grain growth in nc-copper is composed of both thermally-activated and irradiation-induced components. Tensile tests revealed minimal change in the source hardening component of the yield stress in MG-copper, while the source hardening component was found to decrease with increasing radiation exposure in nc-copper.

View Accepted Manuscript (DOE)

Research Organization:: Idaho National Laboratory (INL), Idaho Falls, ID (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC07-05ID14517

OSTI ID:: 1628450

Journal Information:: Materials, Journal Name: Materials Journal Issue: 3 Vol. 9; ISSN MATEG9; ISSN 1996-1944

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: English

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