Journal
JOURNAL OF THE MECHANICS AND PHYSICS OF SOLIDS
Volume 120, Issue -, Pages 154-178Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.jmps.2018.03.010
Keywords
Twinning; Dynamics; Magnesium; In-situ high speed imaging; High strain rate
Funding
- Army Research Laboratory
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In-situ ultra high speed optical imaging with 200ns temporal resolution is used to gain insight into the evolution of twinning in single crystal magnesium under dynamic loading. Under compression along the a-axis, nucleation of twins is observed to occur on two conjugate {1012} twin planes. Twin nucleation appears to be stress-driven with the first twins nucleating at resolved stresses of 5-7 MPa. These first twins propagate across the specimen at very high speeds of the order 1 km/s. After the first twins stop growing, twin boundary growth is observed to be very small and relatively slow. The nucleation of additional twins from the boundaries of pre-existing twins is found to be preferred over twin boundary growth at these rates of loading. As a result, twin nucleation is found to have a dominant contribution to twin volume fraction evolution at later times. Lastly, twinning is found to have a dominant contribution to the net plastic strain at these strain rates. (C) 2018 Elsevier Ltd. All rights reserved.
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