Abstract
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.
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Acknowledgements
We gratefully acknowledge the assistance of Alexander Ananiadis and Mantong Zhao in collecting the diffraction data. This work was sponsored in part by the Army Research Laboratory and was accomplished under Cooperative Agreement No. W911NF-12-2-0022. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for government purposes notwithstanding any copyright notation herein. This work is based upon research conducted at the Cornell High Energy Synchrotron Source (CHESS) which is supported by the National Science Foundation and the National Institutes of Health/National Institute of General Medical Sciences under NSF award DMR-1332208. Detector development at Cornell is supported by the DOE Grants DE-SC0016035 and DE-SC0017631, the Keck Foundation, and CHESS. P.K.L. would like to acknowledge OSD-T&E (Office of Secretary Defense-Test and Evaluation), Defense-Wide/PE0601120D8Z National Defense Education Program (NDEP)/BA-1, Basic Research, for their support.
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Hustedt, C.J., Lambert, P.K., Kannan, V. et al. In Situ Time-Resolved Measurements of Extension Twinning During Dynamic Compression of Polycrystalline Magnesium. J. dynamic behavior mater. 4, 222–230 (2018). https://doi.org/10.1007/s40870-018-0152-8
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DOI: https://doi.org/10.1007/s40870-018-0152-8