A comprehensive comparison between the effect of elevated temperature constrained groove pressing on the microstructural evolutions, crystallographic texture, and mechanical properties of Al 2024 and Mg AZ91D alloys

Abstract

In the present research work, constrained groove pressing as one of the sheet's severe plastic deformation is employed at elevated temperature to investigate the influence of this technique on the microstructural evolutions and mechanical properties of 2024 aluminum and AZ91D magnesium alloy sheets. With this regard, three cycles of constrained groove pressing have been conducted on these alloys' annealed sheets. Optical microscopy and X-ray diffraction were used to discuss the microstructure and crystallographic texture evolution. Results demonstrated that the average grain size of the annealed specimens was decreased to 11 µm and 14 µm after one pass at 300°C for 2024 Al and AZ91D Mg alloys, respectively. By measuring the microhardness, it was found that the annealed sample has the highest homogeneity with the minimum inhomogeneity factor 5.80 and 1.86 for the 2024 Al and AZ91D Mg alloys, respectively. The ultimate tensile strength of the annealed sheet was respectively increased up to 21% and 7% for these alloys by performing the first constrained groove pressing pass. Also, all of the mechanical properties variations are changed based on crystallographic texture evolutions.

Developing methods of constrained groove pressing technique: A review

“…Ti6Al4V titanium alloy Use in aerospace and defense sectors 2024 aluminum alloy 111 Process condition CGP three passes at 300 °C Grain refinement Significant improvement Properties Improve strength and anisotropy Remark Higher texture intensity Cu-Zn alloy 110 Process condition CGP first pass with short time treatment at 700 °C Microstructure Inhomogeneity reduces with increasing time Properties Improve ductility and strain hardening with increasing time Remark Premature micro-cracks and voids are healed NiTi alloy 102,112 Process condition CGP first pass with short-time treatments at 350°C Properties Improve yield strength and hardness Remark Use in aerospace and biomedical sectors AZ31 magnesium alloy 61,100,104 Process condition Temperatures ranging 200-350 °C for 10-180 min Microstructure Grain size of 6.92 μm reduces to 1 μm Properties Improve yield strength and hardness 2024 aluminum alloy 113 Process condition CGP three passes at 300 °C Microstructure Grain size of 20 μm reduces to 11 μm Properties Improve yield strength and hardness Remark Annealing leads to homogenous properties AZ91 magnesium alloy 113 Process condition CGP three passes at 300 °C Microstructure Grain size of 18 μm reduces to 14 μm Properties Improve yield strength and hardness Remark Annealing leads to homogenous properties mechanical properties as per our requirements in an application.…”