Thermal stability and mechanical properties of HPT-processed CP-Ti

7th International Conference on Nanomaterials by Severe Plastic Deformation

Huang, Y.^1 ; Mortier, S.^2 ; Pereira, P.H.R.^1,3 ; Bazarnik, P.^4 ; Lewandowska, M.^4 ; Langdon, T.G.^1

Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton

SO17 1BJ, United Kingdom^1

Polytech Montpellier, Montpellier Cedex 5

34095, France^2

CAPES Foundation, Ministry of Education of Brazil, Brasília, DF

70040-020, Brazil^3

Faculty of Materials Science, Warsaw University of Technology, Woloska 141, Warsaw

02-507, Poland^4

关键词: Commercial pure titanium;    Deformed microstructure;    Electron back scatter diffraction;    Grain size;    Hardness measurement;    High pressure torsions;    Lower temperatures;    Very low temperatures;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012012/pdf
DOI  :  10.1088/1757-899X/194/1/012012

来源: IOP

【 摘 要 】

A grade 2 commercial pure titanium was processed by high-pressure torsion (HPT) at room temperature to 20 turns. X-ray analysis showed that an ω phase formed during HPT processing but disappeared immediately during 10 minutes post-HPT short-term annealing even at a very low temperature of 473 K. The thermal stability of HPT-processed microstructural evolution was studied by electron backscatter diffraction (EBSD). After short-term annealing at lower temperatures (473 and 673 K), the disc centre had relative higher hardness value than the edge area, and it was found that the centre retained the feature of deformed microstructure whereas the edge showed recovery / recrystallization of the microstructure. Short-term annealing at higher temperatures (873 and 973 K) led to almost uniformly distributed hardness and microstructures in the disc centre and edge areas. Grain structures and hardness measurements indicate complete recrystallization occurred at 873 K.