Abstract
Effects of initial twins on dynamic torsional properties of extruded AZ31 alloy were investigated by introducing {10–12} twins into it through precompression to 3 and 6% strains along the extrusion direction and performing torsional testing at a strain rate of 1.4 × 103 s−1 using a torsional Kolsky bar system. The as-extruded sample without twins showed higher dynamic torsional properties than the precompressed samples with many initial twins; the maximum shear strength and fracture shear strain decreased with increasing amount of initial twins. In the as-extruded sample, twinning occurred vigorously throughout the gage section of the tubular specimen during high-strain-rate torsional tests, resulting in heavily deformed morphology, many macrocracks, and rough fractured surfaces. The increased amount of initial twins suppressed the twinning behavior and localized the applied torsional deformation; this resulted in an almost unchanged sample shape, no secondary cracks, and a flat fracture plane, thereby deteriorating the dynamic torsional properties of the extruded alloy.
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This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korean government (MSIP, South Korea) (No. 2016R1C1B2012140 and No. 2017R1A4A1015628).
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Lee, J.U., Song, S.W., Kim, Y. et al. Effects of {10–12} Twins on Dynamic Torsional Properties of Extruded AZ31 Magnesium Alloy. Met. Mater. Int. 24, 283–289 (2018). https://doi.org/10.1007/s12540-018-0030-x
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DOI: https://doi.org/10.1007/s12540-018-0030-x