Formation of a Gradient Structure in a Material by Twist Extrusion
| Autor: | Viktor Varyukhin, O. Prokof'eva, N. M. Shkatulyak, T. S. Sovkova, V. V. Usov, D. V. Prilepo, Yan Beygelzimer, A. N. Sapronov |
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| Rok vydání: | 2020 |
| Předmět: |
Diffraction
business.product_category Materials science 020502 materials Metals and Alloys 02 engineering and technology law.invention Core (optical fiber) 0205 materials engineering Optical microscope law Die (manufacturing) Extrusion Texture (crystalline) Deformation (engineering) Composite material business Necking |
| Zdroj: | Russian Metallurgy (Metally). 2020:573-578 |
| ISSN: | 1555-6255 0036-0295 |
| Popis: | Hexagonal samples with an initial coarse-grained structure (CG) in the near-axis zone and a gradient ultrafine-grained (UFG) structure at the periphery are formed by twist extrusion (TE) of commercial-purity copper through a hexagonal twist die with a small twist-line slope. This hybrid structure of the samples provides conditions for a large uniform deformation before necking (due to the CG core) and a high yield strength (due to the gradient UFG periphery). The hybrid CG–UFG structure can be formed due to the threshold nature of metal grain refinement during cyclic deformation. A simple relation is derived for estimating the CG core diameter of the sample. The structure and the texture of the samples are investigated by X‑ray diffraction and optical microscopy. |
| Databáze: | OpenAIRE |
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