Chin. Phys. Lett.  2012, Vol. 29 Issue (12): 127803    DOI: 10.1088/0256-307X/29/12/127803
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
The Evolution of Defects in Deformed Cu-Ni-Si Alloys during Isochronal Annealing Studied by Positron Annihilation
QI Ning1, JIA Yan-Lin, LIU Hui-Qun, YI Dan-Qing2, CHEN Zhi-Quan1**
1Hubei Nuclear Solid Physics Key Laboratory, Department of Physics, Wuhan University, Wuhan 430072
2School of Materials Science and Engineering, Central South University, Changsha 410083
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QI Ning, JIA Yan-Lin, LIU Hui-Qun et al  2012 Chin. Phys. Lett. 29 127803
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Abstract The effect of isochronal annealing on the deformation-induced defects in pure Cu and Cu-Ni-Si alloys is studied by positron annihilation spectroscopy. For the cold-rolled Cu, annealing up to 900°C causes a gradual recovery of the deformation-induced defects and monotonous decrease of the hardness. This indicates that its hardening is mainly related with defects such as dislocations. However, for the hot-rolled and quenched Cu-Ni-Si alloy, although there is a partial recovery of defects after annealing below 500°C, formation of additional defects is observed after annealing above 500°C. The hardness of Cu-Ni-Si alloy has a maximum value after annealing at 500°C, which suggests that the hardening of Cu-Ni-Si alloy is not due to defects, but primarily due to the precipitation formed during annealing. Further annealing of the Cu-Ni-Si alloy above 500°C results in over-aging effect and the precipitates lose coherence with the host matrix, which leads to positron trapping by vacancy clusters in the incoherent interface region.
Received: 21 September 2012      Published: 04 March 2013
PACS:  78.70.Bj (Positron annihilation)  
  61.66.Dk (Alloys )  
  61.72.J- (Point defects and defect clusters)  
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https://cpl.iphy.ac.cn/10.1088/0256-307X/29/12/127803       OR      https://cpl.iphy.ac.cn/Y2012/V29/I12/127803
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QI Ning
JIA Yan-Lin
LIU Hui-Qun
YI Dan-Qing
CHEN Zhi-Quan
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