Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible Torsion
The binary as-cast Al–Cu alloys Al-5%Cu, Al-25%Cu, and Al-33%Cu (in wt %), composed of the intermetallic θ-Al<sub>2</sub>Cu and α-Al phases, were prepared from pure components and were subsequently severely plastically deformed by extrusion combined with reversible torsion (KoBo) to refi...
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| Online Access: | https://www.mdpi.com/1996-1944/13/24/5803 |
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doaj-edd7f9ca6ee84185a3f58b300ae10cc52020-12-19T00:07:04ZengMDPI AGMaterials1996-19442020-12-01135803580310.3390/ma13245803Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible TorsionKinga Rodak0Dariusz Kuc1Tomasz Mikuszewski2Faculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, PolandFaculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, PolandFaculty of Materials Engineering, Silesian University of Technology, Krasińskiego 8, 40-019 Katowice, PolandThe binary as-cast Al–Cu alloys Al-5%Cu, Al-25%Cu, and Al-33%Cu (in wt %), composed of the intermetallic θ-Al<sub>2</sub>Cu and α-Al phases, were prepared from pure components and were subsequently severely plastically deformed by extrusion combined with reversible torsion (KoBo) to refinement of α-Al and Al<sub>2</sub>Cu phases. The extrusion combined with reversible torsion was carried out using extrusion coefficients of λ = 30 and λ = 98. KoBo applied to the Al–Cu alloys with different initial structures (differences in fraction and phase size) allowed us to obtain for alloys (Al-25%Cu and Al-33%Cu), with higher value of intermetallic phase, large elongations in the range of 830–1100% after tensile tests at the temperature of 400 °C with the strain rate of 10<sup>−4</sup> s<sup>−1</sup>. The value of elongation depended on extrusion coefficient and increase, with λ increasing as a result of α-Al and Al<sub>2</sub>Cu phase refinement to about 200–400 nm. Deformation at the temperature of 300 °C, independently of the extrusion coefficient (λ), did not ensure superplastic properties of the analyzed alloys. A microstructural study showed that the mechanism of grain boundary sliding was responsible for superplastic deformation.https://www.mdpi.com/1996-1944/13/24/5803KoBo extrusionmechanical propertiesAl–Cu alloysmicrostructure and superplastic deformation |
| collection |
DOAJ |
| language |
English |
| format |
Article |
| sources |
DOAJ |
| author |
Kinga Rodak Dariusz Kuc Tomasz Mikuszewski |
| spellingShingle |
Kinga Rodak Dariusz Kuc Tomasz Mikuszewski Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible Torsion Materials KoBo extrusion mechanical properties Al–Cu alloys microstructure and superplastic deformation |
| author_facet |
Kinga Rodak Dariusz Kuc Tomasz Mikuszewski |
| author_sort |
Kinga Rodak |
| title |
Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible Torsion |
| title_short |
Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible Torsion |
| title_full |
Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible Torsion |
| title_fullStr |
Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible Torsion |
| title_full_unstemmed |
Superplastic Deformation of Al–Cu Alloys after Grain Refinement by Extrusion Combined with Reversible Torsion |
| title_sort |
superplastic deformation of al–cu alloys after grain refinement by extrusion combined with reversible torsion |
| publisher |
MDPI AG |
| series |
Materials |
| issn |
1996-1944 |
| publishDate |
2020-12-01 |
| description |
The binary as-cast Al–Cu alloys Al-5%Cu, Al-25%Cu, and Al-33%Cu (in wt %), composed of the intermetallic θ-Al<sub>2</sub>Cu and α-Al phases, were prepared from pure components and were subsequently severely plastically deformed by extrusion combined with reversible torsion (KoBo) to refinement of α-Al and Al<sub>2</sub>Cu phases. The extrusion combined with reversible torsion was carried out using extrusion coefficients of λ = 30 and λ = 98. KoBo applied to the Al–Cu alloys with different initial structures (differences in fraction and phase size) allowed us to obtain for alloys (Al-25%Cu and Al-33%Cu), with higher value of intermetallic phase, large elongations in the range of 830–1100% after tensile tests at the temperature of 400 °C with the strain rate of 10<sup>−4</sup> s<sup>−1</sup>. The value of elongation depended on extrusion coefficient and increase, with λ increasing as a result of α-Al and Al<sub>2</sub>Cu phase refinement to about 200–400 nm. Deformation at the temperature of 300 °C, independently of the extrusion coefficient (λ), did not ensure superplastic properties of the analyzed alloys. A microstructural study showed that the mechanism of grain boundary sliding was responsible for superplastic deformation. |
| topic |
KoBo extrusion mechanical properties Al–Cu alloys microstructure and superplastic deformation |
| url |
https://www.mdpi.com/1996-1944/13/24/5803 |
| work_keys_str_mv |
AT kingarodak superplasticdeformationofalcualloysaftergrainrefinementbyextrusioncombinedwithreversibletorsion AT dariuszkuc superplasticdeformationofalcualloysaftergrainrefinementbyextrusioncombinedwithreversibletorsion AT tomaszmikuszewski superplasticdeformationofalcualloysaftergrainrefinementbyextrusioncombinedwithreversibletorsion |
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