EFFECT OF HIGH PRESSURE TORSION ON STRUCTURE AND MECHANICAL PROPERTIES OF Al–Ca–Cu ALLOY

S. O. Rogachev; Рогачев С. О.; E. A. Naumova; Наумова Е. А.; N. Yu. Tabachkova; Табачкова Н. Ю.; D. V. Ten; Тен Д. В.; R. V. Sundeev; Сундеев Р. В.; M. Yu. Zadorozhny; Задорожный М. Ю.

doi:10.31857/S0015323023600314

EFFECT OF HIGH PRESSURE TORSION ON STRUCTURE AND MECHANICAL PROPERTIES OF Al–Ca–Cu ALLOY

Authors: Rogachev S.O.¹^,2, Naumova E.A.¹, Tabachkova N.Y.¹, Ten D.V.¹, Sundeev R.V.¹, Zadorozhny M.Y.³
Affiliations:
1. MISiS National University of Science and Technology
2. Institute of Metallurgy and Materials Science. A.A. Baikov, Russian Academy of Sciences
3. Moscow Polytechnic University
Issue: Vol 124, No 6 (2023)
Pages: 550-556
Section: ПРОЧНОСТЬ И ПЛАСТИЧНОСТЬ
URL: https://journals.rcsi.science/0015-3230/article/view/139471
DOI: https://doi.org/10.31857/S0015323023600314
EDN: https://elibrary.ru/WVMRHO
ID: 139471

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Abstract

To improve the balance of strength and ductility of the Al–6% Ca–8% Cu (wt %) alloy, the high-pressure torsion (HPT) deformation followed by annealing was applied. The structure of the as-cast alloy consisted mainly of two eutectics [(Al) + AlCaCu] and [(Al) + (Al, Cu)4Ca + AlCaCu]. HPT through three turns leads to the formation of a predominantly submicrocrystalline structure, refinement of eutectic particles and their more uniform distribution in the sample volume, calcium segregation from AlCuCa and (Al, Cu)4Ca particles, and supersaturation of the (Al) solid solution with copper. Such a structure provides a strengthening of the alloy by a factor of 3.5, but contributes to its embrittlement. Subsequent annealing at 400°C achieves a good balance of strength and ductility of the alloy.

Keywords

severe plastic deformation, high-pressure torsion, aluminum alloys, eutectic, microstructure, mechanical properties

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