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This article is cited in 5 scientific papers (total in 5 papers)
Mechanical properties, strength physics and plasticity
Peculiarities of strengthening of Al-Cu-Zr alloy structured by severe plastic deformation
T. S. Orlovaa, D. I. Sadykovb, M. Yu. Murashkincd, V. U. Kazykhanovc, N. A. Enikeevcd a Ioffe Institute, St. Petersburg, Russia
b St. Petersburg National Research University of Information Technologies, Mechanics and Optics, St. Petersburg, Russia
c Ufa State Aviation Technical University, Ufa, Russia
d Saint Petersburg State University, St. Petersburg, Russia
Abstract:
The effect of small additions of copper on the microstructure and physic-mechanical properties of an ultrafine-grained Al-1.47Cu-0.34Zr (wt%) alloy structured by high pressure torsion after preliminary annealing at 375$^\circ$C for 140 h has been studied. As a result of processing, high values of strength characteristics (conditional yield strength 430 MPa, ultimate tensile strength 574 MPa) with an acceptable level of electrical conductivity (46.1% IACS) and ductility (elongation to fracture $\sim$ 5%) have been achieved. On the basis of the microstructural parameters determined by X-ray diffraction analysis and transmission electron microscopy, hardening mechanisms responsible for such high strength have been analyzed. It was shown that Cu plays the key role in strengthening. The addition of copper significantly contributes to grain refinement and, consequently, to grain-boundary hardening. Alloying with copper leads to significant additional hardening ($\sim$ 130 MPa) in the ultrafine-grained alloy, which is not typical for coarse-grained state. Segregation of Cu at grain boundaries and the formation of Cu nanoclusters are the most probable reasons for this hardening.
Keywords:
aluminum alloys, severe plastic deformation, microstructure, strengthening mechanisms, electrical conductivity.
Received: 05.05.2021 Revised: 05.05.2021 Accepted: 07.05.2021
Citation:
T. S. Orlova, D. I. Sadykov, M. Yu. Murashkin, V. U. Kazykhanov, N. A. Enikeev, “Peculiarities of strengthening of Al-Cu-Zr alloy structured by severe plastic deformation”, Fizika Tverdogo Tela, 63:10 (2021), 1572–1584; Phys. Solid State, 63:12 (2021), 1744–1756
Linking options:
https://www.mathnet.ru/eng/ftt7993 https://www.mathnet.ru/eng/ftt/v63/i10/p1572
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