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Revealing deformation mechanisms in Mg–Y alloy by in situ deformation of nano-pillars with mediated lateral stiffness

Published online by Cambridge University Press:  15 May 2019

Dalong Zhang Open the ORCID record for Dalong Zhang [Opens in a new window] ,
Lin Jiang ,
Xin Wang ,
Irene J. Beyerlein ,
Andrew M. Minor ,
Julie M. Schoenung ,
Subhash Mahajan  and
Enrique J. Lavernia
Dalong Zhang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, California 92697-2575, USA
Lin Jiang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, California 92697-2575, USA
Xin Wang
Affiliation:
Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, California 92697-2575, USA
Irene J. Beyerlein
Affiliation:
Mechanical Engineering Department, Materials Department, University of California-Santa Barbara, Santa Barbara, California 93106, USA
Andrew M. Minor
Affiliation:
Department of Materials Science and Engineering, University of California-Berkeley, and National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Julie M. Schoenung
Affiliation:
Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, California 92697-2575, USA
Subhash Mahajan
Affiliation:
Department of Chemical Engineering and Materials Science, University of California-Davis, Davis, California 95616, USA
Enrique J. Lavernia*
Affiliation:
Department of Chemical Engineering and Materials Science, University of California-Irvine, Irvine, California 92697-2575, USA
*
a)Address all correspondence to this author. e-mail: lavernia@uci.edu
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Abstract

In our previous study, we observed a lack of $\left\{ {10\bar{1}2} \right\}$ twinning in a deformed Mg–Y alloy, which contributed to the observed yield “symmetry.” However, the effects of texture and grain size on polycrystalline deformation made it difficult to fully understand why twinning was not active. Therefore, we report herein in-depth study by in situ transmission electron microscopy, i.e., in situ TEM. The in situ deformation of nano-sized Mg–Y pillars revealed that prismatic slip was favored over twinning, namely, the critical stress required to activate prismatic slip was lower than that for twinning. This finding diametrically differs from that reported in other nano/micro-pillar deformation studies, where twinning is always the dominant deformation mechanism. By measuring the critical stresses for basal, prismatic, and pyramidal slip systems, this in situ TEM study also sheds light on the effects of the alloying element Y on reducing the intrinsic plastic anisotropy in the Mg matrix.

Keywords

Mgtransmission electron microscopy (TEM)nano-indentation
Type
Article
Information
Journal of Materials Research , Volume 34 , Issue 9: Focus Issue: Plasticity and Fracture at the Nanoscales - Advances in in situ Experimentation Techniques Enabling Novel and Extreme Materials/Nanocomposite Design , 14 May 2019 , pp. 1542 - 1554
Copyright
Copyright © Materials Research Society 2019 

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Footnotes

b)

Present address: Pacific Northwest National Laboratory.

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