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Metals and Materials International

, Volume 24, Issue 2, pp 283–289 | Cite as

Effects of {10–12} Twins on Dynamic Torsional Properties of Extruded AZ31 Magnesium Alloy

  • Jong Un Lee
  • Seok Weon Song
  • Yongjin Kim
  • Sang-Hoon Kim
  • Ye Jin Kim
  • Sung Hyuk Park
Article
  • 213 Downloads

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.

Keywords

Metal Extrusion Twinning Optical microscopy Dynamic torsion 

Notes

Acknowledgements

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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Copyright information

© The Korean Institute of Metals and Materials 2018

Authors and Affiliations

  • Jong Un Lee
    • 1
  • Seok Weon Song
    • 2
  • Yongjin Kim
    • 3
  • Sang-Hoon Kim
    • 1
  • Ye Jin Kim
    • 1
  • Sung Hyuk Park
    • 1
  1. 1.School of Materials Science and EngineeringKyungpook National UniversityDaeguRepublic of Korea
  2. 2.Technical Research LaboratoriesPOSCOPohangRepublic of Korea
  3. 3.Gwangyang Steel Products Research Group, Technical Research LaboratoriesPOSCOGwangyangRepublic of Korea

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