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Effects of microstructural morphology on quasi-static and dynamic deformation behavior of Ti-6Al-4V alloy

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Abstract

The effects of microstructural morphology on quasi-static and dynamic deformation behavior of a Ti-6Al-4V alloy were investigated in this study. Quasi-static and dynamic torsional tests were conducted using a torsional Kolsky bar for Widmanstätten, equiaxed, and bimodal microstructures, which were processed by different heat treatments, and then, the test data were analyzed in relation to microstructures, tensile properties, and fracture mode. Quasi-static torsional properties showed a tendency similar to tensile properties and ductile fracture occurred in all three microstructures. Under dynamic torsional loading, maximum shear stress of the three microstructures was higher and fracture shear strain was lower than those under quasi-static loading, but the overall tendency was similar. In the Widmanstätten and equiaxed microstructures, adiabatic shear bands were found in the deformed region of the fractured specimens. The possibility of the adiabatic shear band formation under dynamic loading was quantitatively analyzed, depending on how plastic deformation energy was distributed to either void initiation or adiabatic shear banding. It was found to be most likely in the equiaxed microstructure, whereas it was least likely in the bimodal microstructure.

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Authors and Affiliations

  1. Center for Advanced Aerospace Materials, Pohang University of Science and Technology, 790-784, Pohang, Korea

    Dong-Geon Lee (Research Assistant), Sangho Kim (Research Assistant), Sunghak Lee (Professor) & Chong Soo Lee (Professor)

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  1. Dong-Geon Lee
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  2. Sangho Kim
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  3. Sunghak Lee
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Lee, DG., Kim, S., Lee, S. et al. Effects of microstructural morphology on quasi-static and dynamic deformation behavior of Ti-6Al-4V alloy. Metall Mater Trans A 32, 315–324 (2001). https://doi.org/10.1007/s11661-001-0263-y

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  • DOI: https://doi.org/10.1007/s11661-001-0263-y

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