Abstract
This study investigates the effect of different solidification cooling rates (0.5, 7.5, 13.5, 57.5, and 85 °C/s) on the solidification parameters, microstructure evolution, and mechanical properties of AA5056 Al-Mg alloy. According to the results, augmenting the cooling rate lowered the solidification time, and due to high thermal undercooling, substantially refined the microstructure. For instance, increasing the cooling rate from about 0.5 to about 85 °C/s decreased the fraction of Al3Mg2, Mg2Si, and Fe-rich compounds by 58, 64, and 27%, respectively. It also substantially refined the grains, reduced the size of secondary dendrite arm spacing (SDAS), and lowered the porosity content from about 3.8% to about 0.3%. The hardness, tensile strength, and fracture strain of the alloy increased by 44%, 140%, and 395%, respectively, as the cooling rate increased from 0.5 to 85 °C/s. The fracture mechanism also changed from a brittle-dominated mode to a high-energy ductile mode comprising of extensive dimpled zones at the higher cooling rates.
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Zare, M.A., Taghiabadi, R. & Ghoncheh, M.H. Effect of Cooling Rate on Microstructure and Mechanical Properties of AA5056 Al-Mg Alloy. Inter Metalcast 16, 1533–1543 (2022). https://doi.org/10.1007/s40962-021-00704-6
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DOI: https://doi.org/10.1007/s40962-021-00704-6