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Title: Degradation mechanism of Ni-based superalloy under extreme irradiation environments

This report is a description of various materials (in particular, Rene N4) and their resilience under chemical, physical, and radioactive changes caused by heavy ion irradiation in the MeV range. The following conclusions were reached: the γ' precipitates become fully disordered at a dose of 0.3 dpa: the γ' precipitates partially dissolve after irradiation up to 75 dpa, and the chemical intermixing mainly originates from thermal spike effects; and combining effects of defect clusters, disordering and dissolution determine the evolution of hardness. This work is relevant to materials challenges for Gen IV reactors.
Authors:
 [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
OSTI Identifier:
1228073
Report Number(s):
LA-UR--15-29355
TRN: US1600100
DOE Contract Number:
AC52-06NA25396
Resource Type:
Technical Report
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NICKEL BASE ALLOYS; ATOMIC DISPLACEMENTS; IRRADIATION; HEAVY IONS; PRECIPITATION; MEV RANGE; HARDNESS; REACTOR MATERIALS; THERMAL SPIKES; CRYSTAL DEFECTS; DISSOLUTION; RADIATION DOSES; PHYSICAL RADIATION EFFECTS