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In-Situ TEM Observation of Twinning and Detwinning During Cyclic Loading in Mg

  • Symposium: Deformation, Damage, and Fracture of Light Metals and Alloys
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Abstract

In-situ transmission electron microscopy (TEM) is used to directly observe twin evolution in Mg under tension and compression. Twins grow during tensile loading. Upon load reversal, the first-generation twin detwins by nucleation and growth of a second-generation twin within its volume. This mechanism for detwinning is different from the more traditional mechanism of detwinning by reverse motion of a twin boundary. Reloading in tension causes the second-generation twin to recede, leaving behind residual features. In compression, the second-generation twin re-nucleates in the area of this debris, and grows. Interactions between dislocations and twin boundaries change the character of the observed dislocations. Direct observation of such behavior aids in clearer understanding of the observed microstructures from post-mortem TEM.

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Acknowledgment

The current study was fully funded by the Department of Energy, Basic Energy Science Project FWP06SCPE401.

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Authors and Affiliations

  1. MST Division, Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM, 87545, USA

    Benjamin M. Morrow (Postdoctoral Researcher), Rodney J. McCabe ( Technical Staff Member), Ellen K. Cerreta ( Technical Staff Member) & Carlos N. Tomé ( Technical Staff Member)

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  1. Benjamin M. Morrow
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  2. Rodney J. McCabe
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  3. Ellen K. Cerreta
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  4. Carlos N. Tomé
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Correspondence to Benjamin M. Morrow.

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Manuscript submitted March 14, 2013.

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Morrow, B.M., McCabe, R.J., Cerreta, E.K. et al. In-Situ TEM Observation of Twinning and Detwinning During Cyclic Loading in Mg. Metall Mater Trans A 45, 36–40 (2014). https://doi.org/10.1007/s11661-013-1765-0

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