High-Pressure Torsion of Ti: Synchrotron characterization of phase volume fraction and domain sizes

6th International Conference on Nanomaterials by Severe Plastic Deformation

材料科学;化学

Bolmaro, Raúl E.^1 ; Sordi, Vitor L^2 ; Ferrante, Maurizio^2 ; Brokmeier, Heinz-Günter^3 ; Kawasaki, Megumi^4,5 ; Langdon, Terence G^5,6

Instituto de Física Rosario, Facultad de Ciencias Exactas, Ingeniería y Agrimensura, CONICET-UNR, Bv. 27 de Febrero 210 bis, (S2000EZP) Rosario, Argentina^1

Department of Materials Engineering, Federal University of Sao Carlos, Sao Carlos-SP 13565-905, Brazil^2

Institut für Werkstoffkunde und Werkstofftechnik, TU Clausthal, Notkestr. 85, 22607 Hamburg, Germany^3

Division of Materials Science and Engineering, Hanyang University, 17 Haengdang-dong, Seongdong-gu, Seoul 133-791, Korea, Republic of^4

Departments of Aerospace and Mechanical Engineering and Materials Science, University of Southern California, Los Angeles CA 90089-1453, United States^5

Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, United Kingdom^6

关键词: Domain size;    ECAP;    High pressure torsions;    Phase volume fraction;    Processing parameters;    Radial direction;    Transition phasis;    Vickers microhardness;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/63/1/012147/pdf
DOI  :  10.1088/1757-899X/63/1/012147

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Rods of grade 2 Ti were processed by Equal-Channel Angular Pressing (ECAP) (φ 120° at 573 K) employing 2, 4 and 6 passes. The same billets were further deformed by High-Pressure Torsion (HPT) at room temperature, varying both the hydrostatic pressure (1 and 6 GPa) and the number of rotations (n 1 and 5). The ECAP and HPT samples were studied by synchrotron radiation at DESY-Petra III GEMS line. On the ECAP samples, textures were thus determined while for both ECAP and HPT samples the measurements were further analyzed by MAUD. Domain sizes and phase volume fractions were determined as a function of the radial direction of the samples. Alpha and Omega phases were detected in different amounts depending mostly on hydrostatic pressure and shear deformation. These transition phases can be pressure-induced during HPT processing and the results of Vickers microhardness measurements were related to the processing parameters and to the amounts of these phases.