Effect of Modification with Different Contents of Sb and Sr on the Thermal Conductivity of Hypoeutectic Al-Si Alloy

In this paper, the effects of size, morphology and distribution of eutectic silicon on the thermal conductivity of Al-8Si alloy modified by Sr (0.04, 0.08, 0.12 wt.%) and Sb (0.1, 0.3, 0.5 wt.%) elements with T6 heat treatment were investigated. The results show that the modified fibrous eutectic si...

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Bibliographic Details
Published in:Metals (Basel ) 2020-12, Vol.10 (12), p.1637
Main Authors: Guo, Jin, Guan, Zhi-Ping, Yan, Rui-Fang, Ma, Pin-Kui, Wang, Ming-Hui, Zhao, Po, Wang, Jin-Guo
Format: Article
Language:English
Subjects:
Aging
Al-Si alloy
Alloys
Aluminum alloys
Aluminum base alloys
Boron
Clustering
Communication
Electrical resistivity
Electron transport
eutectic silicon
Eutectic temperature
Heat conductivity
Heat transfer
Heat treatment
Intermetallic compounds
Investigations
Microstructure
modification
Morphology
Scanning electron microscopy
Silicon
Solid solutions
Spheroidizing
Thermal conductivity
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Summary:In this paper, the effects of size, morphology and distribution of eutectic silicon on the thermal conductivity of Al-8Si alloy modified by Sr (0.04, 0.08, 0.12 wt.%) and Sb (0.1, 0.3, 0.5 wt.%) elements with T6 heat treatment were investigated. The results show that the modified fibrous eutectic silicon has a significant capability of improvement of thermal conductivity, while the amount of the modifier has a relatively weak effect on thermal conductivity. After T6 treatment, the fracture or spheroidization of the flake eutectic silicon and the disappearance of clustering phenomenon could raise thermal conductivity, but the coarsening of fibrous eutectic silicon is inconducive to thermal conductivity. Finally, the effect of eutectic silicon on electron transport is analyzed in detail, which could provide a reference for enhancing the thermal (or electrical) conductivity of hypoeutectic Al-Si alloy through effective microstructure control.
ISSN:2075-4701
2075-4701
DOI:10.3390/met10121637