INFLUENCE OF SOLIDIFICATION RATE ON ELECTRICAL AND MECHANICAL PROPERTIES OF EUTECTIC AND HYPEREUTECTIC AL-SI ALLOYS | ||||
| The International Conference on Applied Mechanics and Mechanical Engineering | ||||
| Article 23, Volume 18, 18th International Conference on Applied Mechanics and Mechanical Engineering., April 2018, Page 1-14 PDF (1.18 MB) | ||||
| Document Type: Original Article | ||||
| DOI: 10.21608/amme.2018.34959 | ||||
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| Authors | ||||
| M. M. Meiz1; M. S. El-Wazery2; S. M. Khafagy3; R. A. Elsad4 | ||||
| 1Graduate student, Production Engineering and Mechanical Design Department, Faculty of Engineering, Minoufia University, Shebin El-Kom, Egypt. | ||||
| 2Lecturer, Production Engineering and Mechanical Design Department, Faculty of Engineering, Minoufia University, Shebin El-Kom, Egypt. | ||||
| 3Associate Professor, Tabbin institute for metallurgical studies, Cairo, Egypt. | ||||
| 4Lecturer, Basic Science Department, Faculty of Engineering, Minoufia University, Shebin El-Kom, Egypt. | ||||
| Abstract | ||||
| ABSTRACT Eutectic Al–13 wt. % Si and hypereutectic Al-16 wt. % Si were prepared by using permanent mould casting technique. Effect of the cooling technique on the cast microstructure, mechanical properties, and electrical conductivity of Al-Si alloys was investigated by using the conventional water-cooled and air-cooled methods. The mechanical properties such as the yield stress, tensile strength, hardness, and impact energy were measured at various cooling methods. Microstructure with scanning electron microscope (SEM) and Energy dispersive spectrometer (EDS) analysis of Al-Si alloys have been studied. In addition, the hardness after solution treatment at 529 °C for 2 h and artificial ageing at various temperatures 180 °C and 210° C for aging time 2- 10 h was measured. The results show enhancement in the mechanical and electrical properties for the eutectic Al-13 wt. % Si and hypereutectic Al-16 wt. % Si alloys for the water-cooled over the air-cooled technique. In addition, the largest value of the impact energy (4.91 J) was obtained for the eutectic Al-13 wt. % Si alloys compared to the hypereutectic Al-16 wt. % Si alloys at 3.09 J for watercooled- medium. The total solidification time (TST) of Al 13% wt. Si was longer than that time for the hypereutectic Al 16% wt. Si at various cooling mediums. Aging studies of Al-Si alloys with aging temperatures 180 ºC and 210 ºC show that the hardness values increased as the silicon content increases. For hypereutectic Al-16 wt. % Si at aging temperature 180 ºC and aging time 4 h by using water-cooled technique, it was observed that the maximum hardness value reached to 100 HRD compared that value was 87 HRD for the eutectic Al-13 wt. % Si alloy. | ||||
| Keywords | ||||
| Hypereutectic Al-Si; Permanent mould casting; Mechanical Properties; electrical conductivity; Artificial ageing | ||||
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