Microstructure, mechanical properties and superplasticity of the Al–Cu–Y–Zr alloy

The phase composition, mechanical properties, and superplastic deformation behavior of a novel Al-4.7Cu-1.6Y-0.3Zr alloy were analyzed. The precipitation of Al3(Zr,Y) dispersoids was observed during a homogenization treatment. The precipitates have an L12 structure and a mean size of 17 and 19 nm at...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2019-06, Vol.758, p.28-35
Main Authors: Pozdniakov, A.V., Barkov, R. Yu, Amer, S.M., Levchenko, V.S., Kotov, A.D., Mikhaylovskaya, A.V.
Format: Article
Language:English
Subjects:
Aluminum alloys
Copper
Dispersions
Elongation
Mechanical properties
Phase composition
Plastic deformation
Precipitates
Recrystallization
Strain rate
Superplastic deformation
Superplastic forming
Superplasticity
Thermomechanical treatment
Ultimate tensile strength
Yttrium
Zirconium base alloys
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Summary:The phase composition, mechanical properties, and superplastic deformation behavior of a novel Al-4.7Cu-1.6Y-0.3Zr alloy were analyzed. The precipitation of Al3(Zr,Y) dispersoids was observed during a homogenization treatment. The precipitates have an L12 structure and a mean size of 17 and 19 nm at 540 and 590 °C, respectively. The sheets exhibit a yield strength of 292 MPa, an ultimate tensile strength of 320 MPa, and an elongation of 5.3% after simple thermomechanical treatment and annealing at 100 °C. The Al-4.7Cu-1.6Y-0.3Zr alloy exhibits superplasticity with m > 0.4 and elongation of 300–400% within a temperature range of 550–580 °C and a strain rate range of 1 × 10−4 to 1 × 10−3 s−1.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2019.04.118