Effects of microstructural factors on quasi-static and dynamic deformation behaviors of Ti-6Al-4V alloys with widmanstätten structures

  • Dong-Geun Lee
  • Sunghak Lee
  • Chong Soo Lee
  • Sunmoo Hur


The effects of microstructural factors on the quasi-static tensile and dynamic torsional deformation behaviors in Ti-6Al-4V alloys with Widmanstätten structures were investigated in this study. Dynamic torsional tests were conducted using a torsional Kolsky bar for five Widmanstätten structures, in which microstructural parameters such as colony size and α lamellar spacing were varied by heat treatments, and then the test data were analyzed in relation to microstructures, tensile properties, and fracture mode. Under dynamic torsional loading, maximum shear stress was largely dependent on colony size, whereas shear strain at the maximum shear stress point was on colony size as well as α lamellar spacing. Adiabatic shear bands were found in the deformed area of the fractured torsional specimens, and their width was smallest in the structure whose colony size and α lamellar spacing were both large. The possibility of the adiabatic shear band formation was quantitatively analyzed in relation to microstructural factors. It was the highest in the coarse Widmanstätten structure, which was confirmed by the theoretical critical shear strain (υ c ) condition for the adiabatic shear band formation.


Material Transaction Colony Size Maximum Shear Stress Adiabatic Shear Band Lamellar Spacing 
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Copyright information

© ASM International & TMS-The Minerals, Metals and Materials Society 2003

Authors and Affiliations

  • Dong-Geun Lee
    • 1
  • Sunghak Lee
    • 2
    • 1
  • Chong Soo Lee
    • 2
    • 1
  • Sunmoo Hur
    • 3
  1. 1.the Center for Advanced Aerospace MaterialsPohang University of Science and TechnologyPohangKorea
  2. 2.Center for Advanced Aerospace MaterialsPohang University of Science and TechnologyKorea
  3. 3.the Agency for Defense DevelopmentDaejeonKorea

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