The heat treatment cycles that are currently applied to semi-solid processed components are mostly those that are in use for dendritic casting alloys. These heat treatments are not necessarily the optimum treatments. It is shown that a decrease of the solution treatment time at 540 o C from 6 hours to 1 hour does not alter the T4 or T6 tensile properties of the SSM processed A356 alloy. Slightl...

Kebutuhan kursi roda di Indonesia sangat tinggi namun dalam pemenuhannya masih impor. Kursi adaptif lokal mengalami kekalahan pasar negeri karena beberapa permasalahan produksi seat and back cushion. Penelitian ini bertujuan mengevaluasi yang ada saat dan mengembangkan desain baru untuk mendapatkan efisiensi efektivitas produksi. Reverse engineering merupakan langkah tercepat melakukan evaluasi...

This article reports the effects of various artificial aging methods and lubrication modes (dry, mist, wet) on the recorded cutting forces and chip morphology in drilling Al-Si-Mg (A356) cast alloys. In the course of this work, the work part sampled were as-received alloy (T0), solution heat-treated alloy (SHT) and then aged alloys at 155°C, 180°C, and 220°C (T4, T6, T61, T7), respectively. The...

The present study was performed on A356 alloy [Al-7 wt %Si 0.0.35 wt %Mg]. To that La and Ce were added individually or combined up to 1.5 wt % each. The results show that these rare earth elements affect only the alloy melting temperature with no marked change in the temperature of Al-Si eutectic precipitation. Additionally, rare earth metals have no modification effect up to 1.5 wt %. In addi...

Abstract The single scale SiC p reinforcement has a limited effect on the comprehensive performance of composite, which restricts optimization and improvement its performance. In order to improve material’s strong plasticity, wear resistance, thermal expansion other properties requirements. (micron nano) dual-scale /A356 composites with different volume fractions were prepared using combination...

The present study examined wear characteristics of A356/melon shell ash particulate composites. Dry-sliding the stainless steel ball against specimen disc revealed the abrasive wear behavior of the composites under loads of 2 and 5N. The composite showed lower wear rate of 2.182 × 10-4 mm3/Nm at 20 wt% reinforced material under load of 5N. Results showed that wear rate decreased significantly w...

Abstract The effects of the grain refinement and eutectic Si modification on tensile properties by using Al-B-Sr master alloys in A356 cast alloy were investigated. Two different alloys, Al-4%B-1%Sr (4B1Sr) Al-3%B-3%Sr (3B3Sr), developed. In microstructure observation, consisted AlB 2 , SrB 6 AlSrF, KAlF 4 Al Sr compounds. It should be noted that α-Al phase also exists two alloy. result showed ...

A solution treatment of 1 hour at 540 o C provided the best results for rheocast alloy A356-T6. Natural aging has a significant influence on the subsequent artificial aging response of the alloy. Arrhenius-type equations were derived to predict the time-to-peak hardness as a function of artificial aging temperature.