First-Principle Investigation of the Structural Stability and Electronic Property of Precipitates on the Cu-Rich Side of Cu-Ni-Si Alloys

被引：0

作者：

龙永强 ^{[1
,2
]}

刘平 ^{[3
]}

刘勇 ^{[4
]}

贾淑果 ^{[4
]}

田宝红 ^{[4
]}

机构：

[1] School of Materials Science and Engineering Shanghai Jiaotong University

[2] School of Materials Science and Engineering,Henan University of Science and Technology

[3] College of Mechanical Engineering University of Shanghai for Science and Technology

[4] School of Materials Science and Engineering Henan University of Science and Technology

来源：

JournalofShanghaiJiaotongUniversity(Science) | 2011年 / 16卷 / 03期

基金：

中国国家自然科学基金;

关键词：

precipitate; first-principles; electronic structure; structural stability; Cu-Ni-Si alloy;

D O I：

暂无

中图分类号：

TG146.15 [];

学科分类号：

080502 ;

摘要：

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 thatδ-Ni2Si,γ-Ni5Si2andβ-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(Ef)and strong hybridization between the Ni-3d and Si-3p states.Compared with the other two precipitates,theδ-Ni2Si precipitate has the greatest structural stability,which is resulted from its lower DOS at Efand the main bonding peaks slightly moving to the low energy region.

引用

页码：266 / 271

页数：6

共 4 条

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