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**
1 Hubei Nuclear Solid Physics Key Laboratory, Department of Physics, Wuhan University, Wuhan 4300722 School of Materials Science and Engineering, Central South University, Changsha 410083
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.
收稿日期: 2012-09-21
出版日期: 2013-03-04
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2012, Vol. 29 
