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Ultra-high-strain-rate shearing and deformation twinning in nanocrystalline aluminum

  • Experimental Solid Mechanics
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Abstract

Nanocrystalline aluminum films with grain sizes of 50–100 nm were made through E-beam evaporation. The films were then subjected to high-rate shearing deformations with strain rates of 105–106 s−1, with local shear stresses of the order of 10 GPa. The experimental configuration is that of a compression–torsion Kolsky bar, where the specimen is a thin film (thickness 200 nm) mounted on a silicon wafer ring. Strain rates during the shearing are determined from the measured torsional waves in the bars. Site-specific TEM samples are prepared using focused ion beam micromachining to investigate the regions of large plastic deformation. Deformation twins and stacking faults are found to develop under the high-strain-rate shearing. The formation of twinning in pure aluminum with comparatively large grain sizes and the high-strain-rate promotion of twinning are discussed, and possible mechanisms are considered.

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Acknowledgments

The authors are grateful for financial support from the Army Research Laboratory, the discussion with Prof. Hemker at the Johns Hopkins University, and the technical assistance of Dr. Kenneth Livi with the STEM. This work was performed under the auspices of the Center for Advanced Metallic and Ceramic Systems at Johns Hopkins. This research was sponsored by the Army Research Office through Grant Number DAAD190110536, and in part by the Army Research Laboratory (ARMAC-RTP) under ARMAC-RTP Cooperative Agreement Number DAAD19-01-2-0003.

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  1. Department of Mechanical Engineering, The Johns Hopkins University, Baltimore, MD, 21218, USA

    B. Cao, N. P. Daphalapurkar & K. T. Ramesh

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  1. B. Cao
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  2. N. P. Daphalapurkar
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  3. K. T. Ramesh
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Correspondence to N. P. Daphalapurkar.

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Cao, B., Daphalapurkar, N.P. & Ramesh, K.T. Ultra-high-strain-rate shearing and deformation twinning in nanocrystalline aluminum. Meccanica 50, 561–574 (2015). https://doi.org/10.1007/s11012-014-9952-7

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  • DOI: https://doi.org/10.1007/s11012-014-9952-7

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