Semisolid processing of aluminium LM6 alloy using cooling slope casting

Sarjuni, Noor Afiqah Nabila (2016) Semisolid processing of aluminium LM6 alloy using cooling slope casting. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study is about the semi solid metal processing of aluminium LM6 alloy using cooling slope casting. In this study, the most influential parameters between the pouring temperature and the length of cooling slope that affect the globulization of LM6 alloy during cooling slope casting were studied. Besides, the hardness and tensile strength of cooling slope casting and conventional casting samples were investigated. All the experimental works were accomplished by using same LM6 alloy. The aluminium LM6 alloy feedstock billets were prepared through the cooling slope technique and conventional casting. Several of samples were then treated with a T6 heat treatment that is solution treatment 530°C for 8 hours, quenching in water, followed by aging at 155°C for 3 hours. All of the samples were then characterised by optical microscopy (OM), hardness tests as well as tensile tests. The results revealed that at pouring temperature of 735°C and 300 mm cooling slope length, the LM6 alloy exhibits the spherical microstructural feature due to all dendritic structures were altered into ɑ-Al globule and rosette. The Vicker’s hardness value indicated that cooling slope casting sample promoted the higher hardness than conventional casting. In addition, it was observed that for ultimate tensile strength, the sample poured at 715°C with cooling slope length of 300 mm which is 150.451 MPa has the higher value compared to other conditions and as-cast sample. In all investigations and mechanical testing, the cooling slope casting that underwent T6 heat treatment revealed the positive results which became the most dominant properties in microstructure distribution, hardness and tensile properties, in contrast with non heat treated sample.

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