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- Title
Effect of α phase morphologies on shear localization behavior of TC4 titanium alloy at high strain rate.
- Authors
Wang, Pengyu; Mao, Pingli; Zhou, Le; Wang, Zhi; Wang, Feng; Wei, Ziqi; Liu, Xuanyu; Liu, Zheng
- Abstract
The aim of this study was to explore the effects α phase morphology on the mechanical properties, the adiabatic shear band (ASB) and the recrystallization behavior of Ti-6Al-4 V (TC4) alloy during high strain-rate compression tests via split Hopkinson pressure bar (SHPB) apparatus. The strain rate and temperature of the deformation were set at 2500 s−1 and 25 ℃, respectively. Two kinds of the samples of α phase morphologies were obtained by heat treatment, which were equiaxed and lamellar structure. Microstructure of the ASBs in TC4 alloy was investigated by optical microscopy, scanning electron microscopy and electron backscattering diffraction. The results revealed that the specimen with lamellar structure had a higher peak shear stress than that of equiaxed structure. ASBs were found to form in both equiaxed and lamellar structure. The equiaxed structure had a wider width and a longer length of ASB than those ASBs in lamellar structure. The lamellar structure had the higher volume fraction of high-angle grain boundaries, and the grain orientation spread has a smaller area fraction and more uniform stress distribution in ASB than those of equiaxed structure, which indicated that lamellar structure had higher extent of dynamic recrystallization in ASB.
- Subjects
STRAIN rate; ELECTRON backscattering; HEAT treatment; TITANIUM alloys; SHEARING force; STRESS concentration; SCANNING electron microscopy
- Publication
Journal of Materials Science, 2024, Vol 59, Issue 9, p3984
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-024-09385-y