Al-Cu-Mg-Ag合金Ω相价电子结构与沉淀硬化能力的关系

doi:10.11896/cldb.20030073

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Abstract Based on the empirical electron theory of solids and molecules, the VES of Ω phase was calculated in this paper, then the spatial distribution of the primary bond of covalent bonds was analyzed, the relationships between the strongest covalent bond and dislocation motion, the covalent electron density and the precipitate strength, and the bonding ability and the precipitate stability were studied. It is showed that the main bond-net distribution appears plum blossom-like and the flower heart is connected by the strongest covalent bond with Cu-Cu atoms. The bonding force of the strongest covalent bond of the matrix α is 0.208 57 while that of Ω is 0.490 56, so the Ω precipitation from {111} plane of the matrix can make the block of dislocation slip on {111} plane increased by 135.20%. The strength of Ω is 2.67%, 15.83% bigger than that of S and θ′ respectively from the point of view of the covalence electron density. The stability of Ω is 91.31%, 291.92% bigger than that of S and θ′ respectively from the point of view of bonding ability. The precipitation-hardening ability of phase Ω precipitated form {111} plane is stronger than that of phase S and phase θ′ precipitated form {001} plane respectively from the point of view of covalence electron structure.

Key words： Al-Cu-Mg-Ag alloy Ω phase empirical electron theory of solids and molecules valence electron structure precipitation hardening

Published: 01 July 2021

CLC number:

TG113.25

Fund:Science and Technology Planning Project of Science and Technology Department of Liaoning Province (SY2016008).

About author:: Hua Qu, associate professor of School of Materials Science and Engineering in Liaoning University of Technology. She received her Ph.D. from Northeastern University in June 2006. At present, she is focusing on the research of valence-bond theory research and application of microstructure and mechanical properties in titanium alloy and aluminum alloy. She has published more than 40 academic papers in domestic and foreign journals.
Weidong Liu, professor of School of Materials Science and Engineering in Liaoning University of Technology. He received his Ph.D. of material physics and chemistry major from Northeastern University in June 2002, and worked on post-doctoral research for two years in Shanghai Jiao Tong University since 2003. It is mainly engaged in EET theory research and application of microstructure and mechanical properties of metal material. He has published more than 60 academic papers in domestic and foreign journals.

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Cite this article:

QU Hua,XU Qiaozhi,LIU Weidong, et al. Relationship Between the Valence Electron Structure of Ω and the Ability of Precipitation Hardening in Al-Cu-Mg-Ag Alloys[J]. Materials Reports, 2021, 35(12): 12110-12113.

URL:

http://www.mater-rep.com/EN/10.11896/cldb.20030073 OR http://www.mater-rep.com/EN/Y2021/V35/I12/12110

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