Grain Boundary Segregation and Intermetallic Precipitation in Coarsening Resistant Nanocrystalline Aluminum Alloys

Devaraj, Arun; Wang, W.; Vemuri, R.; Kovarik, L.; Jiang, X.; Bowden, M.; Trelewicz, J. R.; Mathaudhu, S.; Rohatgi, Aashish

doi:10.1016/j.actamat.2018.09.038

Title: Grain Boundary Segregation and Intermetallic Precipitation in Coarsening Resistant Nanocrystalline Aluminum Alloys

Abstract

In-spite of all of the unique properties of nanocrystalline materials, they are notorious when it comes to their susceptibility to thermally induced grain coarsening, thus imposing an upper limit to their application temperature. In this study, we demonstrate a coupled Monte Carlo-molecular dynamics simulation-guided experimental approach of improving the resistance to thermally induced grain coarsening in light-weight nanocrystalline Al-Mg alloys. The structure, grain boundary segregation of Mg, and extent of grain coarsening of the Al-Mg alloys were characterized using plan view and cross-sectional transmission electron microscopy and atom probe tomography. Coarsening resistance is attributed to a combination of thermodynamic stabilization of grain boundaries by controlled Mg segregation, and kinetic stabilization through pinning of the boundaries with nanoscale intermetallic precipitates. Furthermore, we highlight the opportunities in extending the upper limit of application temperature for nanocrystalline alloys by using a complementary thermodynamic and kinetic stabilization approach.

Authors:

^[1]; Wang, W. ^[2]; Vemuri, R. ^[1]; Kovarik, L. ^[1]; Jiang, X. ^[1]; Bowden, M. ^[1];

^[2]; Mathaudhu, S. ^[3]; Rohatgi, Aashish ^[1]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Stony Brook Univ., Stony Brook, NY (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States); Univ. of California, Riverside, CA (United States)

Publication Date:: 2018-09-20

Research Org.:: Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Biological and Environmental Research (BER)

OSTI Identifier:: 1477775

Alternate Identifier(s):: OSTI ID: 1636947

Report Number(s):: PNNL-SA-135423
Journal ID: ISSN 1359-6454; PII: S135964541830750X

Grant/Contract Number:: AC05-76RL01830

Resource Type:: Accepted Manuscript

Journal Name:: Acta Materialia

Additional Journal Information:: Journal Volume: 165; Journal ID: ISSN 1359-6454

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Al-Mg; grain boundary segregation; intermetallic precipitation; nanocrystalline; stability

Citation Formats


                    Devaraj, Arun, Wang, W., Vemuri, R., Kovarik, L., Jiang, X., Bowden, M., Trelewicz, J. R., Mathaudhu, S., and Rohatgi, Aashish. Grain Boundary Segregation and Intermetallic Precipitation in Coarsening Resistant Nanocrystalline Aluminum Alloys.  United States: N. p., 2018. 
Web.  https://doi.org/10.1016/j.actamat.2018.09.038.

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                    Devaraj, Arun, Wang, W., Vemuri, R., Kovarik, L., Jiang, X., Bowden, M., Trelewicz, J. R., Mathaudhu, S., & Rohatgi, Aashish. Grain Boundary Segregation and Intermetallic Precipitation in Coarsening Resistant Nanocrystalline Aluminum Alloys.  United States.  https://doi.org/10.1016/j.actamat.2018.09.038

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                    Devaraj, Arun, Wang, W., Vemuri, R., Kovarik, L., Jiang, X., Bowden, M., Trelewicz, J. R., Mathaudhu, S., and Rohatgi, Aashish. Thu .  
"Grain Boundary Segregation and Intermetallic Precipitation in Coarsening Resistant Nanocrystalline Aluminum Alloys".  United States.  https://doi.org/10.1016/j.actamat.2018.09.038.  https://www.osti.gov/servlets/purl/1477775.

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@article{osti_1477775,

  title        = {Grain Boundary Segregation and Intermetallic Precipitation in Coarsening Resistant Nanocrystalline Aluminum Alloys},

  author       = {Devaraj, Arun and Wang, W. and Vemuri, R. and Kovarik, L. and Jiang, X. and Bowden, M. and Trelewicz, J. R. and Mathaudhu, S. and Rohatgi, Aashish},

  abstractNote = {In-spite of all of the unique properties of nanocrystalline materials, they are notorious when it comes to their susceptibility to thermally induced grain coarsening, thus imposing an upper limit to their application temperature. In this study, we demonstrate a coupled Monte Carlo-molecular dynamics simulation-guided experimental approach of improving the resistance to thermally induced grain coarsening in light-weight nanocrystalline Al-Mg alloys. The structure, grain boundary segregation of Mg, and extent of grain coarsening of the Al-Mg alloys were characterized using plan view and cross-sectional transmission electron microscopy and atom probe tomography. Coarsening resistance is attributed to a combination of thermodynamic stabilization of grain boundaries by controlled Mg segregation, and kinetic stabilization through pinning of the boundaries with nanoscale intermetallic precipitates. Furthermore, we highlight the opportunities in extending the upper limit of application temperature for nanocrystalline alloys by using a complementary thermodynamic and kinetic stabilization approach.},

  doi          = {10.1016/j.actamat.2018.09.038},

  journal      = {Acta Materialia},

  number       = ,

  volume       = 165,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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https://doi.org/10.1016/j.actamat.2018.09.038

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Cited by: 9 works

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Figures / Tables:

Table 1: Summary of literature on nanostructured Al-Mg binary alloys, sorted in the order of increasing Mg%. The literature reported wt % value is listed in normal font while the corresponding converted at % value is italicized.

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Works referencing / citing this record:

Interaction of precipitate with shear–coupled grain boundary migration
journal, October 2019

Tan, Fusheng; Fang, Qihong; Li, Jia
Acta Mechanica, Vol. 231, Issue 1
DOI: 10.1007/s00707-019-02538-0

Atomistic Study of the Effect of Magnesium Dopants on the Strength of Nanocrystalline Aluminum
journal, February 2019

Kazemi, Amirreza; Yang, Shengfeng
JOM, Vol. 71, Issue 4
DOI: 10.1007/s11837-019-03373-3

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Abstract

Citation Formats

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