Thermal stability of an Al-6061 alloy processed by high-pressure torsion

Authors: Azzeddine, H., Khalfallah, A., Avettand-Fènoël, M.N., Baudin, T., Brisset, F., Huang, Y., Langdon, T.G.

Journal: Advanced Engineering Materials

eISSN: 1527-2648

ISSN: 1438-1656

DOI: 10.1002/adem.202502093

Abstract:

The occurrence of static recrystallization (SRX) and grain growth (GG) is examined in an Al-6061 alloy processed by high-pressure torsion for 10 turns at room temperature during isochronal heat treatment in the temperature range of 473–723 K for 30 min. The results demonstrate a normal GG behavior in which the mean grain size continuously increases with increasing annealing temperature from 0.44 ± 0.1 μm (deformation state) to 8.7 ± 0.8 μm at 723 K. Coincidentally, the Vickers microhardness decreases from 155 ± 3 (deformation state) to 43.5 ± 4.1 Hv0.1 after annealing at 573 K due to SRX and then reaches a steady state up to 723 K due to GG. A texture analysis reveals the gradual development of a C shear component in the SRX stage (523–623 K) and its dominance in the GG stage (673–723 K). The activation energy for SRX obtained through differential scanning calorimetry analyses is equal to 85.4 ± 4.2 kJ mol⁻¹, indicating a dominance by grain boundary self-diffusion. The activation energy for GG is estimated by the Arrhenius equation as 68.4 ± 2.4 kJ mol⁻¹, indicating the poor thermal stability of the high-pressure torsion-processed Al-6061 alloy.

https://eprints.bournemouth.ac.uk/41653/

Source: Scopus

Thermal Stability of an Al-6061 Alloy Processed by High-Pressure Torsion

Authors: Azzeddine, H., Khalfallah, A., Avettand-Fenoel, M.-N., Baudin, T., Brisset, F., Huang, Y., Langdon, T.G.

Journal: ADVANCED ENGINEERING MATERIALS

eISSN: 1527-2648

ISSN: 1438-1656

DOI: 10.1002/adem.202502093

https://eprints.bournemouth.ac.uk/41653/

Source: Web of Science

Thermal stability of an Al-6061 alloy processed by high-pressure torsion

Authors: Azzeddine, H., Khalfallah, A., Avettand-Fènoël, M.-N., Baudin, T., Brisset, F., Huang, Y., Langdon, T.G.

Journal: Advanced Engineering Materials

Publisher: Wiley-Blackwell

eISSN: 1527-2648

ISSN: 1438-1656

DOI: 10.1002/adem.202502093

Abstract:

The occurrence of static recrystallization (SRX) and grain growth (GG) were examined in an Al-6061 alloy processed by high-pressure torsion for 10 turns at room temperature during isochronal heat treatment in the temperature range of 473 to 723 K for 30 min. The results demonstrated a normal grain growth behaviour in which the mean grain size continuously increased with increasing annealing temperature from 0.44 ± 0.1 µm (deformation state) to 8.7 ± 0.8 µm at 723 K. Coincidentally, the Vickers microhardness decreased from 155 ± 3 (deformation state) to 43.5 ± 4.1 Hv0.1 after annealing at 573 K due to SRX and then reached a steady-state up to 723 K due to GG. A texture analysis revealed the gradual development of a C shear component in the SRX stage (523-623 K) and its dominance in the GG stage (673-723 K). The activation energy for SRX obtained through differential scanning calorimetry analyses was equal to 85.4 ± 4.2 kJ/mol indicating a dominance by grain boundary self-diffusion. The activation energy for GG was estimated by the Arrhenius equation as 68.4 ± 2.4 kJ/mol indicating the poor thermal stability of the HPT-processed Al-6061 alloy.

https://eprints.bournemouth.ac.uk/41653/

Source: Manual

Preferred by: Yi Huang