First-principle investigation of the structural stability and electronic property of precipitates on the Cu-rich side of Cu-Ni-Si alloys |
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| Authors: | Yong-qiang Long Ping Liu Yong Liu Shu-guo Jia Bao-hong Tian |
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| Institution: | [1]School of Materials Science and Engineering,Shanghai Jiaotong University,Shanghai 200240 China [2]School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003 Henan China [3]College of Mechanical Engineering, University of Shanghai for Science and Technology, Shanghai 200093 China |
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| Abstract: | The energetic and electronic structures of precipitates on the Cu-rich side of Cu-Ni-Si alloys were investigated by using the first-principle calculations based on plane-wave pseudopotential method. The negative formation heats and the cohesive energies of these precipitates were estimated with electronic structure calculations, and their structural stability was also analyzed. The results show that δ-Ni2Si, γ-Ni5Si2 and β-Ni3Si precipitates all have great alloying ability and structural stability, which, after comparing their density of states (DOS), is found attributed to the pseudogap effect near the Fermi level (E F) and strong hybridization between the Ni-3d and Si-3p states. Compared with the other two precipitates, the δ-Ni2Si precipitate has the greatest structural stability, which is resulted from its lower DOS at E F and the main bonding peaks slightly moving to the low energy region. |
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