Document Type : Original Research Article
Authors
1
Department of Metallurgy and Materials Engineering, Imam Khomeini International University, Qazvin, IRAN
2
Imam khomeini international university
3
Faculty of Metallurgy and Materials Engineering, University of Tehran, Tehran, IRAN
10.22034/frj.2023.410726.1182
Abstract
In this study the effect of grain refinement was studied on the hot tearing behavior of 3 wt. % Ce-modified 2024 Al alloy. Towards this end, different amounts of Ti (0.01, 0.02, and 0.05 wt. %) were added to the molten alloy through Al-5Ti-1B master alloy. According to the results, adding Ti marginally improved the fluidity length, relatively reduced the size shrinkage micropores, dispersed the micropores, reduced the grains size, and decreased the alloy hot tearing susceptibility (HTS). The addition of 0.01, 0.02, and 0.05 wt. % Ti decreased the alloy porosity content, grain size, and the HTS by 5, 20, 31%, 20, 75, 80%, and 9, 24, 34%, respectively. Based on the microstructural characterization and hot tear subsurfaces examination results, the relative improvement of hot tearing behavior can be explained by the refinement of grains and its positive consequences such as decreasing the liquid film thickness between the grains (which increases the capillary force and improves inter-grain feeding), increasing the alloy strength, decreasing the linear contraction, and decreasing the stress applied on grain boundaries as easy growth locations for the hot tear cracks.
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