Grain boundary segregation and intermetallic precipitation in coarsening resistant nanocrystalline aluminum alloys

• Published in: Acta materialia Vol. 165; no. C; pp. 698 - 708
• Main Authors: Devaraj, A., Wang, W., Vemuri, R., Kovarik, L., Jiang, X., Bowden, M., Trelewicz, J.R., Mathaudhu, S., Rohatgi, A.
• Format: Journal Article
• Language: English
• Published: United States Elsevier Ltd 15.02.2019; Elsevier
• Subjects: Al-Mg; Grain boundary segregation; Intermetallic precipitation; Nanocrystalline; Nanostructured materials, Al Alloys, Thermal stability; Stability; Al-Mg; Stability; Grain boundary segregation; Intermetallic precipitation; Nanocrystalline
• ISSN: 1359-6454; 1873-2453
• DOI: 10.1016/j.actamat.2018.09.038

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 scanning 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. Thus, we highlight the opportunities in extending the upper limit of application temperature for nanocrystalline alloys by using a complementary thermodynamic and kinetic stabilization approach. [Display omitted]