|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Pan American Materials Congress: Nanocrystalline and Ultra-fine Grain Materials and Bulk Metallic Glasses
||Mechanical Behavior and Adiabatic Shear Localization of Ultrafine-grained Titanium
||Zezhou Li, Bingfeng Wang, Shiteng Zhao, Ruslan Z. Valiev, Kenneth S. Vecchio, Marc A. Meyers
|On-Site Speaker (Planned)
The mechanical behavior of ultrafine-grained titanium (120 nm and 500 nm) was examined in the low and high-strain-rate regimes. The ultrafine grained titanium shows low strain hardening rate and the strain rate sensitivity of ultrafine-gained titanium was found to be the same as the coarse grained commercial pure titanium. Dynamic deformation and failure mechanisms of ultrafine-gained titanium (~120 nm) were studied by using a specimen geometry in which forced shear is imposed to a narrow region. The smaller grain size and lower temperature can lead to the formation of narrower shear band under same strain and strain rate condition. The microstructure inside the adiabatic shear band consists of a mixture of elongated grains and equiaxed nanograins that are smaller than initial grains due to the dynamic recrystallization. The adiabatic shear band were then subjected to combined brittle and ductile failure.
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