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

Published online by Cambridge University Press:  03 August 2015

M. Haghshenas ,
V. Bhakhri ,
R. Oviasuyi  and
R.J. Klassen
M. Haghshenas
Affiliation:
Mechanical & Mechatronics Engineering, University of Waterloo, Waterloo (ON) N2L 3G1, Canada
V. Bhakhri*
Affiliation:
Mechanical & Materials Engineering, the University of Western Ontario, London (ON) N6A 5B9, Canada
R. Oviasuyi
Affiliation:
NOVA Chemical Corporation, Calgary (AB), T2P 5C6, Canada
R.J. Klassen
Affiliation:
Mechanical & Materials Engineering, the University of Western Ontario, London (ON) N6A 5B9, Canada
*
Address all correspondence to V. Bhakhri at[email protected]
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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.

Type
Research Letters
Information
MRS Communications , Volume 5 , Issue 3 , September 2015 , pp. 513 - 518
Copyright
Copyright © Materials Research Society 2015 

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