Hot Deformation Behavior of Aluminum Alloys AA7010 and AA7075

Journal Article · Thu Aug 15 04:00:00 EDT 2019 · Journal of Materials Engineering and Performance

DOI:https://doi.org/10.1007/S11665-019-04231-8· OSTI ID:22970555

Anil Kumar, V. ^[1]; Sarath Krishnan, A. ^[2]; Niteshraj, J. ^[3]

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1. Vikram Sarabhai Space Centre, Materials and Mechanical Entity (India)
2. Govt. Engineering College (India)
3. Indian Institute of Technology, Madras (India)

The hot deformation behavior of high-strength aluminum alloys AA7010 and 5 was studied through hot isothermal compression testing in the temperature regime of 623-723 K (at an interval of 25 K) and at varying strain rates (0.001 to 10 s{sup −1}). The safe zone of hot workability of both the alloys was determined using the instability criteria and correlating with the microstructure evolution. Zener–Hollomon parameters were calculated, and constitutive equations were also derived. Common characteristics observed in both the alloys were adiabatic shear band formation at a temperature of 623 K and strain rate of 10 s{sup −1} and flow localization at combination of all temperatures and high strain rate of 10 s{sup −1} with evolution of very fine recrystallized (DRX) grains. High-temperature resistance to deformation, large extent of recrystallization and relatively larger zone of stable deformation and higher activation energy in Al alloy AA7010 were observed as compared to AA7075. Considering the role of precipitates, dynamic recrystallization was found to have significant role in governing the hot deformation behavior of the alloys. Prediction of constitutive equations was found to be more accurate at higher temperatures and at moderate-to-high strain rates with relatively less error in AA7075 alloy as compared to AA7010 alloy.

• OSTI ID: 22970555
• Journal Information: Journal of Materials Engineering and Performance, Journal Name: Journal of Materials Engineering and Performance Journal Issue: 8 Vol. 28; ISSN 1059-9495; ISSN JMEPEG
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION SPECTROSCOPY
ACTIVATION ENERGY
ALUMINIUM ALLOYS
CRYSTAL LATTICES
ELECTRON DIFFRACTION
EQUATIONS
NANOSTRUCTURES
STRAIN RATE
STRAINS