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Interaction Between Basal Slip and a Mg17Al12 Precipitate in Magnesium

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Abstract

We performed molecular dynamics simulations and investigated interactions between a Mg17Al12 precipitate and a basal dislocation in magnesium. Modified embedded-atom method potentials for multiple-component systems were used in our simulations. The simulation results show that the basal dislocation is able to shear through the matrix and the precipitate/matrix interface, without creating a loop around the precipitate. The precipitate is only elastically deformed by the external shear strain. This interaction can be considered an extreme case of the Orowan mechanism when the strength of the precipitate/matrix interface is weak. Cross slip of the basal dislocation was observed when the precipitate size was 3.0 nm. The dislocation changed its slip plane to another basal plane via the \( (01\overline{1} 0) \) prismatic and the \( (0\overline{1} 11) \) pyramidal planes, creating jogs on these non-basal planes. The jogs had low mobility and debris was created when the jogs were dragged forward by the Shockley partial dislocations.

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Acknowledgments

M.L. is grateful for the support from the Key Project of Sichuan Provincial Education Department (No. 10ZA101), the Key Lab of Ministry of Education of China (No. SBZDPY-11-22), and the Scientific Research Fund of Xihua University (No. R0620204). B.L. and M.F.H. thank the support from the Center for Advanced Vehicular Systems, Mississippi State University.

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Authors and Affiliations

  1. School of Mechanical Engineering and Automation, Xihua University, Cheng-du, 610039, Sichuan, P.R. China

    Min Liao (Associate Professor)

  2. Center for Advanced Vehicular Systems, Mississippi State University, Starkville, MS, 39759, USA

    B. Li (Associate Research Professor) & M. F. Horstemeyer (Professor)

Authors
  1. Min Liao
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  2. B. Li
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  3. M. F. Horstemeyer
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Correspondence to Min Liao.

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Manuscript submitted August 12, 2013.

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Liao, M., Li, B. & Horstemeyer, M.F. Interaction Between Basal Slip and a Mg17Al12 Precipitate in Magnesium. Metall Mater Trans A 45, 3661–3669 (2014). https://doi.org/10.1007/s11661-014-2284-3

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