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In-Situ SEM High Strain Rate Testing of Large Diameter Micropillars Followed by TEM and EBSD Postmortem Analysis

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A Correction to this article was published on 15 September 2021

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Abstract

Background

Dislocation dynamic simulations are intended as a tool to understand and predict the mechanical behavior of metallic materials, but its prediction has never been directly verified by experiments due to differences in specimen strain rate and size.

Objective

In this work, a comprehensive experimental framework is proposed to attempt direct comparison between experiments and discrete dislocation dynamics (DDD) modelling.

Methods

By integrating high-throughput sample fabrication and a customized testing apparatus, the sample size and strain rate typically employed in DDD simulations are explored experimentally. Constitutive properties such as stress-strain response are measured, and microstructural information is obtained from transmission electron microscopy (TEM) imaging, electron backscatter diffraction (EBSD), and TEM-based orientation mapping.

Results

Magnesium and copper were selected, as case studies, to demonstrate the newly developed experimental procedure. Measured stress-strain responses for Mg are consistent with those obtained with a miniaturized Hopkison bar experiments. By exploiting the validated workflow, the effect of strain rate on micropillar heterogeneous deformation and associated dislocation plasticity were revealed.

Conclusion

The work establishes a methodology for the systematic study of not only metals but also other materials and structures at the microscale and high strain rates.

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Acknowledgements

H. D. Espinosa gratefully acknowledge financial support from the Army Research Lab through award No. W911NF1220022. The authors thank Dr. Robert Stroud (NANOMEGAS USA) for acquiring the TEM nano-mapping data reported in Fig. 14(d) and acknowledge the Argonne National Lab - Center for Nanomaterial user awards 57577, 57549, and 67558.

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Authors and Affiliations

  1. Theoretical and Applied Mechanics, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA

    Z. Lin & H. D. Espinosa

  2. Department of Mechanical Engineering, Northwestern University, 2145 Sheridan Road, Evanston, Illinois, 60208, USA

    H. D. Espinosa

  3. Army Research Laboratory, U.S, Aberdeen Proving Ground, Aberdeen, Maryland, 21005, USA

    D. J. Magagnosc

  4. Argonne National Lab, 9700 S. Cass Avenue, Lemont, Illinois, 60439, USA

    J. Wen

  5. Department of Mechanical System Engineering, Kumoh National Institute of Technology, Gumi, Gyeongbuk, 39177, Republic of Korea

    C.-S. Oh

  6. Department of Nano-mechanics, Korea Institute of Machinery and Materials, Daejeon, 34103, Republic of Korea

    S.-M. Kim

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  1. Z. Lin
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  3. J. Wen
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  6. H. D. Espinosa
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Correspondence to H. D. Espinosa.

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Lin, Z., Magagnosc, D.J., Wen, J. et al. In-Situ SEM High Strain Rate Testing of Large Diameter Micropillars Followed by TEM and EBSD Postmortem Analysis. Exp Mech 61, 739–752 (2021). https://doi.org/10.1007/s11340-021-00693-x

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