Abstract
Abstract. The bimetal casting process using the liquid–liquid technique was developed to produce a high-quality hyper-eutectic Al–21Si / hypo-eutectic Al–7.5Si alloy bimetal material. Microstructure and microhardness were investigated as a function of the time interval between pouring hypo-eutectic and hyper-eutectic alloys. A bimetal material was successfully fabricated using a liquid–liquid casting technique with a 10 s time interval in a permanent mould casting. A unique structure comprised of hyper-eutectic Al–21Si, hypo-eutectic Al–7.5Si and a eutectic interface of 70 µm thickness was obtained. This structure totally differs from that obtained using a higher time interval above 10 s that showed an imperfect interface bond due to the shrinkage cavity and formation of oxides. The hardness variation from the upper zone of 117.5 HV to the lower zone of 76 HV corresponded to the variation in Si and the content of other alloying elements. The proposed total solidification time control method is a promising approach for the successful fabrication of liquid–liquid bimetal material.
Highlights
Graded materials (FGMs) are engineering materials whose properties change gradually with volume
Metal and polymer matrix composites (MMCs) have a broad spectrum of property combinations required in a wide range of engineering applications, high cost, corrosion behaviour and product machinability limitation sources of reinforcing materials are still a problem associated with the development of metal and polymer matrix composites (MMCs) (Oghenevweta et al, 2014; Algamdi et al, 2018; Parida et al, 2014; Sahoo et al, 2013; Ray et al, 2018; Nayak et al, 2019)
Bimetallic materials fabricated though liquid–solid and liquid–liquid casting routes could be promising alternatives for metal and polymer matrix composites for a wide range of materials to be used for engineering applications due to their low cost and high gradient physical and mechanical properties (Ramadan et al, 2020a, b and c)
Summary
Graded materials (FGMs) are engineering materials whose properties change gradually with volume. Metal and polymer matrix composites (MMCs) have a broad spectrum of property combinations required in a wide range of engineering applications, high cost, corrosion behaviour and product machinability limitation sources of reinforcing materials are still a problem associated with the development of MMCs (Oghenevweta et al, 2014; Algamdi et al, 2018; Parida et al, 2014; Sahoo et al, 2013; Ray et al, 2018; Nayak et al, 2019). Bimetallic materials fabricated though liquid–solid and liquid–liquid casting routes could be promising alternatives for metal and polymer matrix composites for a wide range of materials to be used for engineering applications due to their low cost and high gradient physical and mechanical properties (Ramadan et al, 2020a, b and c).
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