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Materials 2016, 9(8), 662; doi:10.3390/ma9080662

Acoustic Emission of Deformation Twinning in Magnesium

1
Theoretical & Applied Mechanics Group, Department of Mechanical Engineering, Drexel University, Philadelphia, PA 19104, USA
2
Hopkins Extreme Material Institute, John Hopkins University, Baltimore, MD 21218, USA
3
Department of Mechanical Engineering, Mississippi State University, Starkville, MS 39762, USA
4
Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, Aachen 52062, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Alkiviadis Paipetis
Received: 16 June 2016 / Revised: 27 July 2016 / Accepted: 28 July 2016 / Published: 6 August 2016
(This article belongs to the Special Issue Acoustic Waves in Advanced Materials)
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Abstract

The Acoustic Emission of deformation twinning in Magnesium is investigated in this article. Single crystal testing with combined full field deformation measurements, as well as polycrystalline testing inside the scanning electron microscope with simultaneous monitoring of texture evolution and twin nucleation were compared to testing at the laboratory scale with respect to recordings of Acoustic Emission activity. Single crystal testing revealed the formation of layered twin boundaries in areas of strain localization which was accompanied by distinct changes in the acoustic data. Testing inside the microscope directly showed twin nucleation, proliferation and growth as well as associated crystallographic reorientations. A post processing approach of the Acoustic Emission activity revealed the existence of a class of signals that appears in a strain range in which twinning is profuse, as validated by the in situ and ex situ microscopy observations. Features extracted from such activity were cross-correlated both with the available mechanical and microscopy data, as well as with the Acoustic Emission activity recorded at the laboratory scale for similarly prepared specimens. The overall approach demonstrates that the method of Acoustic Emission could provide real time volumetric information related to the activation of deformation twinning in Magnesium alloys, in spite of the complexity of the propagation phenomena, the possible activation of several deformation modes and the challenges posed by the sensing approach itself when applied in this type of materials evaluation approach. View Full-Text
Keywords: Acoustic Emission; twinning; Magnesium Acoustic Emission; twinning; Magnesium
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Mo, C.; Wisner, B.; Cabal, M.; Hazeli, K.; Ramesh, K.T.; El Kadiri, H.; Al-Samman, T.; Molodov, K.D.; Molodov, D.A.; Kontsos, A. Acoustic Emission of Deformation Twinning in Magnesium. Materials 2016, 9, 662.

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