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Effect of temperature and strain rate on the mechanisms of indentation deformation of magnesium

  • M. Haghshenas (a1), V. Bhakhri (a2), R. Oviasuyi (a3) and R.J. Klassen (a2)

Abstract

Dual-stage, constant loading-rate followed by constant-load, pyramidal indentation experiments were performed to investigate the strain-rate (10−5–10−1/s) and temperature (295–573 K) dependence of pure magnesium. The estimated total activation energy, Q (0.69–1.01 eV), and apparent activation volume, V* (17–28b3), indicate that plastic deformation is controlled by a dislocation cross-slip mechanism. The results from this work and previous studies confirm that, during pyramidal indentation of Mg, the operative deformation mechanism remains the same over a very wide strain-rate and temperature range.

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Corresponding author

Address all correspondence to V. Bhakhri atvbhakhr@uwo.ca

References

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