High Pressure Torsion: from Laminar Flow to Turbulence

7th International Conference on Nanomaterials by Severe Plastic Deformation

Kulagin, R.^1 ; Beygelzimer, Y.^2 ; Ivanisenko, Y.^1 ; Mazilkin, A.^1,3 ; Hahn, H.^1

Institute of Nanotechnology (INT), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen

76344-640, Germany^1

Donetsk Institute for Physics and Engineering Named after O.O. Galkin, NASU, Vernadsky Str. 46, Kyiv

03142, Ukraine^2

Institute of Solid State Physics, RAS, Academician Ossipyan Str.2, Chernogolovka

142432, Russia^3

关键词: Deformed state;    Elemental powders;    High entropy alloys;    High pressure torsions;    Laminar and turbulent flow;    Mechanical synthesis;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/194/1/012045/pdf
DOI  :  10.1088/1757-899X/194/1/012045

来源: IOP

【 摘 要 】

We analyzed experimentally and theoretically deviations from the simple High Pressure Torsion (HPT) scheme. We showed that the nature of the plastic flow and the deformed state of the sample under HPT depends on the structure and mechanical properties of the material being processed. Both laminar and turbulent flows under HPT were analysed. It was demonstrated that non-laminar flow causes intensive mass transfer and mixing of the deformed material. As an example, mechanical synthesis of the high entropy alloys from elemental powders by HPT is presented.