|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Dynamic Behavior of Materials VIII
||Dynamic Deformation and Failure of Ultrafine-grained Titanium
||Zezhou Li, Bingfeng Wang, Shiteng Zhao, Ruslan Z. Valiev, Kenneth S. Vecchio, Marc A. Meyers
|On-Site Speaker (Planned)
Dynamic behavior of ultrafine-grained pure titanium was examined. The strain hardening can be considered as having two regimes: below and above a critical strain; at this point there is a drastic decrease in the slope. The strain-rate sensitivity of ultrafine-grained titanium is found to be approximately the same as its coarse grained counterpart. Based on experimentally determined parameters, the Zerilli-Armstrong equation is modified to describe the mechanical response of the ultrafine-grained titanium over the strain-rate range 10−5 to 103 s−1. Adiabatic shear bands are examined in a forced shear configuration where large strain is imposed in a narrow region. The microstructure inside the adiabatic shear band consists of a mixture of elongated grains and equiaxed nanograins. The formation of equiaxed nanograins is modeled through a mechanism of rotational dynamic recrystallization. The adiabatic shear band eventually fractures by a combination of brittle and ductile failure.
||Planned: Supplemental Proceedings volume