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Atomistic Study of the Effect of Magnesium Dopants on the Strength of Nanocrystalline Aluminum

  • Deformation and Transitions at Grain Boundaries
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Abstract

Atomistic simulations have been used to study the deformation mechanisms of nanocrystalline pure Al and Al-Mg binary alloys. Voronoi tessellation was used to fully create a three-dimensional polycrystalline model with a grain size of 10 nm, while hybrid Monte Carlo and molecular dynamic simulations were used to achieve both mechanical and chemical equilibriums in nanocrystalline Al-5 at.%Mg. The results of tensile tests show an improved strength, including the yield strength and ultimate strength, through doping 5 at.%Mg into nanocrystalline aluminum. The results of atomic structures clearly reveal the multiple strengthening mechanisms related to doping in Al-Mg alloys. At the early deformation stage, up to an applied strain of 0.2, the strengthening mechanism of the dopants exhibits as dopant pinning grain boundary (GB) migration. However, at the late deformation stage, which is close to failure of nanocrystalline materials, dopants can prohibit the initiation of intergranular cracks and also impede propagation of existing cracks along the GBs, thus improving the flow stress of Al-Mg alloys.

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Acknowledgements

This work is financially supported by the faculty start-up funding provided by Purdue School of Engineering and Technology at Indiana University Purdue University, Indianapolis. This research was supported in part by Lilly Endowment, Inc., through its support for the Indiana University Pervasive Technology Institute, and in part by the Indiana METACyt Initiative. The Indiana METACyt Initiative at IU was also supported in part by Lilly Endowment, Inc. This work used the Extreme Science and Engineering Discovery Environment (XSEDE) under Award Allocation Number TG-MSS180015.

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  1. Department of Mechanical and Energy Engineering, Indiana University Purdue University Indianapolis, Indianapolis, IN, 46202, USA

    Amirreza Kazemi & Shengfeng Yang

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  1. Amirreza Kazemi
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  2. Shengfeng Yang
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Correspondence to Shengfeng Yang.

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Kazemi, A., Yang, S. Atomistic Study of the Effect of Magnesium Dopants on the Strength of Nanocrystalline Aluminum. JOM 71, 1209–1214 (2019). https://doi.org/10.1007/s11837-019-03373-3

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  • DOI: https://doi.org/10.1007/s11837-019-03373-3

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