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|Title:||Microstructure and mechanical properties of hypo/hyper-eutectic Al-Si alloys synthesized using a near-net shape forming technique|
|Authors:||Gupta, M. |
|Source:||Gupta, M., Ling, S. (1999-06-01). Microstructure and mechanical properties of hypo/hyper-eutectic Al-Si alloys synthesized using a near-net shape forming technique. Journal of Alloys and Compounds 287 (1-2) : 284-294. ScholarBank@NUS Repository. https://doi.org/10.1016/S0925-8388(99)00062-6|
|Abstract:||In the present study, three aluminum-silicon alloys containing 7, 10 and 19 wt% silicon were synthesized using a novel technique commonly known as disintegrated melt deposition technique. The results following processing revealed that a yield of at least 80% can be achieved after defacing the shrinkage cavity from the as-processed ingots. Microstructural characterization studies conducted on the as-processed samples revealed an increase in the volume fraction of porosity with an increase in silicon content. Porosity levels of 1.07, 1.51 and 2.65% attained in the case of Al-7Si, Al-10Si, and Al-19Si alloys indicates the near-net shape forming capability of the disintegrated melt deposition technique. The results of aging studies conducted on the aluminum-silicon alloys revealed similar aging kinetics irrespective of different silicon content. Results of ambient temperature mechanical tests demonstrate an increase in matrix microhardness and 0.2% yield stress and decrease in ductility with an increase in silicon content in aluminum. Furthermore, the results of an attempt to investigate the effect of extrusion on Al-19Si alloy revealed that the extrusion process significantly assists in reducing porosity and improving microstructural uniformity, 0.2% yield strength, ultimate tensile strength and ductility when compared to the as-processed Al-19Si alloy. The results of microstructural characterization and mechanical properties of aluminum-silicon alloys were finally correlated with the amount of silicon in aluminum and secondary processing technique.|
|Source Title:||Journal of Alloys and Compounds|
|Appears in Collections:||Staff Publications|
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