Thermal Stability of Ultrafine-Grained Pure Titanium Processed by High-Pressure Torsion

Wan Ji Chen; Jie Xu; De Tong Liu; De Bin Shan; Bin Guo; Terence G. Langdon

doi:10.4028/www.scientific.net/MSF.1016.338

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HomeMaterials Science ForumMaterials Science Forum Vol. 1016Thermal Stability of Ultrafine-Grained Pure...

Thermal Stability of Ultrafine-Grained Pure Titanium Processed by High-Pressure Torsion

Abstract:

High-pressure torsion (HPT) was conducted under 6.0 GPa on commercial purity titanium up to 10 turns. An ultrafine-grained (UFG) pure Ti with an average grain size of ~96 nm was obtained. The thermal properties of these samples were studied by using differential scanning calorimeter (DSC) which allowed the quantitative determination of the evolution of stored energy, the recrystallization temperatures, the activation energy involved in the recrystallization of the material and the evolution of the recrystallized fraction with temperature. The results show that the stored energy increases, beyond which the stored energy seems to level off to a saturated value with increase of HPT up to 5 turns. An average activation energy of about 101 kJ/mol for the recrystallization of 5 turns samples was determined. Also, the thermal stability of the grains of the 5 turns samples with subsequent heat treatments were investigated by microstructural analysis and Vickers microhardness measurements. It is shown that the average grain size remains below 246 nm when the annealing temperature is below 500 °C, and the size of the grains increases significantly for samples at the annealing temperature of 600 °C.

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Materials Science Forum (Volume 1016)

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338-344

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https://doi.org/10.4028/www.scientific.net/MSF.1016.338

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Online since:

January 2021

Authors:

Wan Ji Chen*, Jie Xu, De Tong Liu, De Bin Shan, Bin Guo, Terence G. Langdon

Keywords:

Differential Scanning Calorimetry, Grain Growth, High-Pressure Torsion, Recrystallization, Titanium

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