In Situ Time-Resolved Measurements of Extension Twinning During Dynamic Compression of Polycrystalline Magnesium

We report in situ time-resolved measurements of the dynamic evolution of the volume fraction of extension twins in polycrystalline pure magnesium and in the AZ31B magnesium alloy, using synchrotron x-ray diffraction during compressive loading at high strain rates. The dynamic evolution of the twinni...

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Bibliographic Details
Published in:Journal of dynamic behavior of materials 2018-06, Vol.4 (2), p.222-230
Main Authors: Hustedt, C. J., Lambert, P. K., Kannan, V., Huskins-Retzlaff, E. L., Casem, D. T., Tate, M. W., Philipp, H. T., Woll, A. R., Purohit, P., Weiss, J. T., Gruner, S. M., Ramesh, K. T., Hufnagel, T. C.
Format: Article
Language:English
Subjects:
Chemistry and Materials Science
Compressive properties
Deformation
Dislocations
Evolution
Lattice strain
Magnesium
Magnesium base alloys
Materials Science
Metallic Materials
Plastic deformation
Polycrystals
Solid Mechanics
Synchrotron radiation
Texture
Time measurement
Twinning
X-ray diffraction
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Summary:We report in situ time-resolved measurements of the dynamic evolution of the volume fraction of extension twins in polycrystalline pure magnesium and in the AZ31B magnesium alloy, using synchrotron x-ray diffraction during compressive loading at high strain rates. The dynamic evolution of the twinning volume fraction leads to a dynamic evolution of the texture. Although both the pure metal and the alloy had similar initial textures, we observe that the evolution of texture is slower in the alloy. We also measured the evolution of the lattice strains in each material during deformation which, together with the twin volume fractions, allows us to place some constraints on the relative contributions of dislocation-based slip and deformation twinning to the overall plastic deformation during the dynamic deformations.
ISSN:2199-7446
2199-7454
DOI:10.1007/s40870-018-0152-8