About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
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Symposium
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General Poster Session
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Presentation Title |
A-159: Effects of Bi in Rapid Solidification of a Hypoeutectic Al-Si Alloy |
Author(s) |
José Marcelino da Silva Dias, Abdoul-Aziz Bogno, Jose Spinelli, Amauri Garcia, Hani Henein |
On-Site Speaker (Planned) |
José Marcelino da Silva Dias |
Abstract Scope |
In recent years, Al-Si-Bi alloys have drawn a lot of interest due to their self-lubricating property and wear resistance in bearing applications. This study reports on the investigation of the solidification path of an Al-Si-Bi alloy in the Al-rich corner under different thermal histories. Different but complementary analytical tools were used to investigate the effect of Bi on the microstructure and mechanical properties of Al-8wt.%Si-2.5wt.%Bi solidified under varying cooling rates and undercoolings. The solidification trials were done using Impulse Atomization and Differential Scanning Calorimetry. The results were compared with a previously characterized binary hypo-eutectic Al-Si alloy, solidified under the similar conditions. The ternary alloy is found to exhibit two different Si morphologies (i.e. flaky, and fibrous), which were directly related to the solidification path of the ternary alloy and are compared to those obtained from the binary alloy. Finally, Bi addition is found to increase the undercooling and the eutectic cooling rate of the ternary alloy compared to those of the binary one, leading to increased hardness. |
Proceedings Inclusion? |
Undecided |