Microstructure and Nano-hardness of Pure Copper and ODS Copper Alloy under Au Ions Irradiation at Room Temperature

doi:10.1007/s40195-016-0478-y

Abstract

Abstract:

The microstructure and nano-hardness of the pure copper and oxide dispersion-strengthened (ODS) copper alloy subjected to 1.4 MeV Au ions irradiation at room temperature were investigated. After irradiation, dislocation-loops form in both materials, while voids can only be generated in the pure copper. Compared with the irradiated pure copper, larger average diameter and lower number density of irradiation-induced dislocation-loops were detected in the ODS copper alloy, revealing that high-density dislocation and large volume of Al₂O₃ particles existing in the ODS copper alloy can act as effective sinks for the irradiation-induced defects. It was also detected that irradiation hardening in the ODS copper alloy is lower than that in the pure copper. The microstructure and nano-hardness results reveal that the ODS copper alloy has a better irradiation tolerance than the pure copper. In addition, the average diameter of the Al₂O₃ particles in the ODS copper alloy decreases after irradiation, because the Al-O chemical bonds are decomposed and the atoms are redistributed in the matrix during the irradiation process. This work reveals that the irradiation tolerance of the copper can be effectively enhanced by adding nano-sized Al₂O₃ particles into the matrix.

Key words: Oxide, dispersion-strengthened, copper, alloyIons, irradiationMicrostructure, evolutionNano-hardness

Jing Zhang,Yong-Qin Chang,Zhi-Meng Guo,Ping-Ping Liu,Yi Long,Fa-Rong Wan. Microstructure and Nano-hardness of Pure Copper and ODS Copper Alloy under Au Ions Irradiation at Room Temperature[J]. Acta Metallurgica Sinica (English Letters), 2016, 29(11): 1047-1052.

Figures/Tables 8

Fig. 1 Depth profile of the irradiation damage in unit of dpa and Au ion concentration for the pure copper and ODS copper alloy with a fluence of 1015 atom/cm2 irradiation

Fig. 2 TEM micrographs of the un-irradiated samples: a pure copper, b ODS copper alloy, c enlarged part of (b)

Fig. 3 Diameter distribution histogram of the Al2O3 particles in the as-received ODS copper alloy

Fig. 4 TEM images of the irradiated samples with the dose of 10.8 dpa, a dislocation-loops, b voids in the pure copper, c dislocation-loops in the ODS copper alloy

Fig. 5 Diameter distribution histogram of the Al2O3 particles in the irradiated ODS copper alloy: a 1.1 dpa, b 5.4 dpa, c 10.8 dpa

Fig. 6 Nano-hardness as a function of irradiation dose for the irradiated pure copper and ODS copper alloy

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