Influence of Deformation Temperature on the Effect of High Plasticity Implementation in Ultrafine-Grained Al–1.5Cu Alloy

• Published in: Physics of the solid state Vol. 63; no. 11; pp. 1730 - 1738
• Main Authors: Mavlyutov, A. M., Orlova, T. S., Yapparova, E. Kh, Enikeev, N. A., Murashkin, M. Yu
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.11.2021; Springer; Springer Nature B.V
• Subjects: Alloys; Aluminum base alloys; Analysis; Annealing; Copper; Deformation effects; Doping; Low temperature; Mechanical properties; Physics; Physics and Astronomy; Plastic properties; Polyethylenes; Solid State Physics; Specialty metals industry; Temperature dependence; Tensile tests; Thermomechanical treatment; Ultimate tensile strength; Ultrafines; plasticity; ultrafine-grained structure; grain-boundary segregation; severe plastic deformation; strength; aluminum–copper alloys
• ISSN: 1063-7834; 1090-6460
• DOI: 10.1134/S1063783421100255

The effect of the temperature of uniaxial tensile test on the plastification effect (PE) of ultrafine-grained (UFG) Al–1.5Cu (wt %) alloy is studied for the first time. The UFG structure in a material is formed by high-pressure torsion (HPT). A significant increase in the plasticity of an UFG alloy from ~3 to 22% while retaining a high ultimate tensile strength (450 MPa) is achieved due to additional thermomechanical treatment including short-term low-temperature annealing and subsequent small HPT deformation. The temperature range of the PE implementation is revealed. It is shown that a decrease in the deformation temperature results in a gradual decrease in the PE and its disappearance at –20°C. Copper doping results in significant narrowing of the PE implementation range from the low-temperature side in comparison with the UFG Al case. The possible causes of the effect of Cu doping on the temperature dependence of the PE is discussed.