Structural Effect of Two-Dimensional BNNS on Grain Growth Suppressing Behaviors in Al-Matrix Nanocomposites

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dc.contributor.authorNam, Seungjinen_US
dc.contributor.authorChang, Kunoken_US
dc.contributor.authorLee, Woonkien_US
dc.contributor.authorKim, Moon J.en_US
dc.contributor.authorHwang, Jun Yeonen_US
dc.contributor.authorChoi, Hyunjooen_US
dc.contributor.utdAuthorKim, Moon J.en_US
dc.date.accessioned2018-10-22T19:29:51Z
dc.date.available2018-10-22T19:29:51Z
dc.date.created2018-01-25en_US
dc.date.issued2018-10-22
dc.descriptionIncludes supplementary material
dc.description.abstractWhile nanocrystalline (NC) metals exhibit superior strength to conventional microcrystalline metals, their thermal instability has hampered their application at high temperatures. Herein, two-dimensional (2D) boron nitride nanosheets (BNNS) are proposed as reinforcement to enhance the strength as well as the thermal stability of NC Al. The strength of pure Al was increased from 80 to 468 MPa by refining its grains from ~ 600 to ~ 40 nm, and it was further enhanced to 685 MPa by incorporating 2 vol% of BNNS. Moreover, the small amount of BNNS was found to effectively suppress grain growth of NC Al at 580 ⁰C (similar to 0.9 T_m, where T_m is the melting point of Al), which prevented a strength drop at high temperature. Finally, the Zener pinning model in conjunction with phase-field simulations was utilized to qualitatively analyze the effect of the BNNS on the grain boundary pinning as a function of volume, shape, and orientation of the reinforcement. The model demonstrated that the pinning force of 2D reinforcements is much higher than that of spherical particles. Hence, 2D BNNS offer the possibility of developing Al-matrix nanocomposites for high-temperature structural applications.en_US
dc.description.departmentErik Jonsson School of Engineering and Computer Scienceen_US
dc.description.sponsorship"This study was supported by the National Research Foundation (NRF) of Korea, funded by the Ministry of Education, Science and Technology (NRF-2016M2B2A9A02943809 and NRF-2015R1D1A1A01060718, 2017R1A2B3002307), and by Leading Foreign research Institute Recruitment Program through NRF, funded by the Ministry of Science, ICT & Future Planning (MSIP) (2013K1A4A3055679)."en_US
dc.identifier.bibliographicCitationNam, Seungjin, Kunok Chang, Woonki Lee, Moon J. Kim, et al. 2018. "Structural effect of two-dimensional BNNS on grain growth suppressing behaviors in Al-matrix nanocomposites." Scientific Reports 8en_US
dc.identifier.issn2045-2322en_US
dc.identifier.urihttp://hdl.handle.net/10735.1/6211
dc.identifier.volume8en_US
dc.language.isoenen_US
dc.publisherNature Publishing Groupen_US
dc.relation.urihttp://dx.doi.org/10.1038/s41598-018-20150-5en_US
dc.rightsCC BY 4.0 (Attribution)en_US
dc.rights©2018 The Authorsen_US
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/en_US
dc.source.journalScientific Reportsen_US
dc.subjectNanotubesen_US
dc.subjectNanotubes--Mechanical-propertiesen_US
dc.subjectHigh temperaturesen_US
dc.subjectComputer simulationen_US
dc.subjectCopper alloysen_US
dc.subjectHigh pressure (Technology)en_US
dc.subjectComposite materialsen_US
dc.subjectBoron nitrideen_US
dc.titleStructural Effect of Two-Dimensional BNNS on Grain Growth Suppressing Behaviors in Al-Matrix Nanocompositesen_US
dc.type.genrearticleen_US

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