Development of ADC14 hypereutectic ALSi alloy based composite reinforced with SiC , Al2O3 and TiB2 through stir casting
The hypereutectic AlSi alloys contain Si more than 12.3 % (eutectic point), and possesses better mechanical properties than eutectic and hypoeutectic AlSi alloys. But the higher percentage of Si in the hypereutectic AlSi alloy caused to result primary and eutectic Si in microstructure during melt...
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| Format: | Thesis |
| Language: | English English English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://eprints.uthm.edu.my/1776/2/AQEEL%20AHMED%20BHUTTO%20-%20declaration.pdf http://eprints.uthm.edu.my/1776/1/AQEEL%20AHMED%20BHUTTO%20-%2024p.pdf http://eprints.uthm.edu.my/1776/3/AQEEL%20AHMED%20BHUTTO%20-%20fulltext.pdf |
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| Summary: | The hypereutectic AlSi alloys contain Si more than 12.3 % (eutectic point), and
possesses better mechanical properties than eutectic and hypoeutectic AlSi alloys. But
the higher percentage of Si in the hypereutectic AlSi alloy caused to result primary and
eutectic Si in microstructure during melting, which in turns to hitch the mechanical
properties. The proper control of microstructure and addition of common
reinforcement materials (SiC, Al2O3, TiB2) in hypereutectic AlSi alloy will improve
mechanical properties. Thus, in this research work, ADC14 hypereutectic AlSi alloy
based composite reinforced with SiC (5 to 20%), Al2O3 (5 to 15%) and TiB2 (2 to 8%)
was developed through stir casting. The mechanical, physical and thermal properties,
and microstructure were investigated for the developed composite through ASTM
standards. The results showed that tensile strengths and hardness of all the three
composites were increased by increasing the weight percentage of all three
reinforcements. The maximum values of ultimate tensile strength and hardness were
obtained as 115.81 MPa and 69 HV for 20% of SiC and 8% of TiB2 reinforcements
respectively. For physical properties, the optimum values were obtained as 2.67 g/cm3
and 0.023% for 8% of TiB2 and 5% of SiC respectively. For thermal properties, the
optimum values were obtained as 178 W/mK and 10.7 1/ºC x 10−6 for 20% of SiC
and 15% of Al2O3 respectively. Furthermore, the addition of Al2O3 improved the
microstructure of ADC14 hypereutectic alloy based composite. And minor porosities
were observed in microscopic images. Comprehensively, all three reinforced materials
improved the mechanical, physical and thermal properties of the ADC14 hypereutectic
AlSi alloy based composite. The development of ADC14 composite may provide some
practical knowledge in materials engineering. Also, based on the results of hardness
and thermal properties, the developed composite can be applied for automotive part. |
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