A mathematical model of deformation under high pressure torsion extrusion

Roman Kulagin, Yan Beygelzimer, Yuri Estrin, Yulia Ivanisenko, Brigitte Baretzky, Horst Hahn

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


High pressure torsion extrusion (HPTE) is a promising new mechanism for severe plastic deformation of metals and alloys. It enables the manufacture of long products with a radial gradient ultrafine-grained structure and of composite materials with a helical inner architecture at the meso and the macro scale. HPTE is very promising as a technique enabling light weighting, especially with magnesium, aluminium and titanium alloys. For the first time, this article presents an analytical model of the HPTE process that makes it possible to investigate the role of the various process parameters and calculate the distribution of the equivalent strain over the entire sample length. To verify the model, its predictions were compared with the numerical simulations by employing the finite element software QForm. It was shown that potential negative effects associated with the slippage of a sample relative to the container walls can be suppressed through appropriate die design and an efficient use of the friction forces.

Original languageEnglish
Article number306
Issue number3
Publication statusPublished - 1 Mar 2019


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