Effects of Rotary Swaging Parameters and Artificial Ageing on Mechanical Properties and Microstructure of 2024 Precipitation-Hardenable Aluminium Alloy

• DOI: 10.3390/ma13010143
• Publication Date: 2020-01-03T08:28:53Z
• Authors: Jan Nacházel; Jan Palán; Jaromír Dlouhý; Peter Sláma; Zbyšek Nový
• Keywords: Swaging; Precipitation hardening

This work concerns mechanical properties in relation to microstructural changes hardenable EN AW-2024 aluminium alloy wrought and heat treated condition. The material benefits from synergistic effects of hardening mechanisms. Grain boundary strengthening were activated this by rotary swaging. Rotary swaging is a method which shows great promise for industrial use. Precipitation was achieved thanks the material’s age ability. First, artificially-aged furnace at 140–180 °C. Second, natural ageing used. Mechanical as-treated tested processes explored using electron microscopy differential scanning calorimetry. treatment route delivered best results as follows: solution annealing 500 °C/1 h + water cooling artificial 160 °C/21 h. led yield strength close 640 MPa, ultimate above 660 elongation 8%. Electron backscatter diffraction observation revealed that condition, ratio Low-angle High-angle grain boundaries 80:20. microstructure contains both T-phase interior grains, whose particles are normally oval-shaped, S-phase, present two shapes: small oval or coherent needles aligned <100> direction.