Abstract
To improve the mechanical properties of the casting alloys, various attempts have been made to use alternative casting technologies. The Ohno continuous casting (OCC) process is a unidirectional solidification method, which leads to high-quality cast samples. In this study, the Al-Si-Cu-Mg alloy was cast at casting speeds of 1 mm/s, 2 mm/s, and 3 mm/s, by the OCC process. The aim of this study is to investigate the effects of the casting process parameters, such as casting speeds and cooling conditions, on the crystallization characteristics and mechanical properties of OCC-Al-Si-Cu-Mg alloy. Particularly, secondary dendrite arms spacing of α-Al dendrites in OCC samples significantly decreases with increasing casting speed. Moreover, the mean tensile strength of the samples, produced at the highest casting speed of 4.0 mm/s, is significantly higher than that for the samples produced at a casting speed of 1.0 mm/s.
Highlights
The reductions in automotive exhaust greenhouse gases, such as carbon dioxide (CO2 ) and nitrogen oxides (NOx ), are strongly required for environmental reasons
The improvements of the tensile strength of Ohno continuous casting (OCC) samples are owing to the refinement of secondary dendrite arms spacing (SDAS), which may be the obstacles to the movement of dislocations
SDAS of α‐Al dendrites in OCC samples
Summary
The reductions in automotive exhaust greenhouse gases, such as carbon dioxide (CO2 ) and nitrogen oxides (NOx ), are strongly required for environmental reasons. Light-weighting of vehicles presents an opportunity for cutting greenhouse gas emissions. Aluminum (Al) alloys are one of the light weighting automotive materials, which meets vehicle safety and performance requirements [1]. Automotive parts made of heavy steel have been replaced with Al alloys. The hypereutectic Al-Si alloy family is widely used in the automotive industry because of its high strength, good castability, and low density. The Al-Si-Cu-Mg alloy, used in this study, is the commercial hypereutectic
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