Abstract：
:Solute segregating to grain boundary can stabilize the microstructure of nanocrystalline materials, but a lot of solutes also cause embrittlement effect on interfacial strength. Therefore, uncovering the solute effect on grain boundary strength is very important for nanocrystalline alloys design. In this work, we have systematically studied the effects of various solutes on the strength of a Σ5 (310) grain boundary in Cu by first-principle calculations. The solute effects are closely related to the atomic radius of solutes and electronic interactions between solutes and Cu. The solute with a larger atomic radius is easier to segregate the grain boundary but causes more significant grain boundary embrittlement. The weak electronic interactions between the s- and p-block solutes and Cu play a very limited role in enhancing grain boundary strength. While the strong d-states electronic interactions between transition metallic solutes and Cu can counteract embrittlement caused by size mismatch and significantly improve the grain boundary strength. This work deepens our understanding of solute effects on grain boundary strength based on atomic size and electronic interactions.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Huang Z,Wang P,Chen F,Shen Q,Zhang Ldoi
10.1038/s41598-020-74065-1subject
Has Abstractpub_date
2020-10-08 00:00:00pages
16856issue
1issn
2045-2322pii
10.1038/s41598-020-74065-1journal_volume
10pub_type
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