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《Chinese Journal of Engineering》 2017-06
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Effects of precipitates and texture on the anisotropy of high-strength Cu-Ni-Si alloy sheets

WANG Zhi-gang;FENG Xin-yu;YANG Tai-sheng;ZHANG Ying-hui;XIAO Xiang-peng;School of Material Science and Engineering,Jiangxi University of Science and Technology;National Center for Copper Smelting and Process Engineering Technology Research,Jiangxi University of Science and Technology;  
The effects of texture and precipitates on the plane anisotropy of Cu-Ni-Si alloy under different solid-solution temperature conditions were investigated by X-ray diffraction,electron backscattered diffraction,and transmission electron microscopy.The results show that strength and elongation first increase and then decrease with increasing solid-solution temperature,exhibiting apparently anisotropy.After 800 ℃ solid solution,the Cu' and S' are mainly texture and the alloy has weak anisotropic properties,which correlates with the coexistence of Brass,Goss,and {011} 〈511〉orientation owing to deformed grains.Complete recrystallization can be obtained at high temperature solution(≥850 ℃),the Cu' and S' texture intensity increases,whereas the Brass texture weakens and disappears and the anisotropy increases.δ-Ni_2Si precipitation is observed after 850 ℃ solution and subsequent aging,and the crystal orientation between the matrix and precipitates is [001]_(Cu)//[110]_δ and (010)_(Cu)//(001)_δ.The fraction of nanosize precipitates decreases significantly with increasing temperature and this improves the anisotropy.
【Fund】: 国家自然科学基金资助项目(51264012);; 59批中国博士后科学基金面上资助项目(2016M592101);; 江西省科技支撑计划资助项目(20161BBE50065)
【CateGory Index】: TG146.11
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