Journal
NUCLEAR MATERIALS AND ENERGY
Volume 15, Issue -, Pages 17-22Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nme.2018.05.019
Keywords
ODS copper; Mechanical alloying; Microstructure; Mechanical properties
Categories
Funding
- Japan Society for the Promotion of Science
- [16H02443]
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Advanced oxide dispersion strengthened copper alloys are promising structural materials for application in divertor system of future fusion reactors due to high irradiation resistance, high thermal conductivity, and good mechanical properties. In this study, a new ODS copper including 0.42wt%Y2O3 nanosized oxide particles was developed successfully by mechanical alloying method using addition of 1 wt% Stearic acid in Ar atmosphere. Mechanical alloying resulted in decrease of crystallite size to 28 nm in concurrent with increment of dislocation density and hardness to the saturated level of 1.7 x 10(15)m(-2) and 226HV(0.1) after 48 h milling, respectively. Consolidated ODS copper by SPS and then hot roll-annealing at 900 degrees C/60 min showed an average grain size of 1.1 mu m with a near random texture. Furthermore, TEM observations demonstrated fine semicoherent Y2O3 oxide particles distributed with a misfit parameter (delta) of 0.17 in copper matrix with an average size of 10.8 nm and interparticle spacing of 152 nm. Finally, tensile test evaluation determined comparable mechanical properties of the annealed ODS copper (Cu-0.42wt%Y2O3) with Glidcop-Al25 including a yield strength of 272 MPa and total elongation of 12%, by two mechanisms of grain boundary strengthening and oxide particle strengthening.
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