Abstract
The influence of B elements on the morphology of Si phases in Al-11Si and Al-14Si alloys has been investigated employing Optical Microscope, Scanning Electron Microscopy, Transmission Electron Microscopy and Differential Scanning Calorimetry. In Al-11Si alloy, the addition of B element not only refines the primary Al dendrites, but also reduces the length of eutectic Si plates. In Al-14Si alloys, the addition of B element promotes the nucleation temperature of primary Si phases, but shows weak influence on the nucleation temperature of eutectics. The effects of B element on the morphologies of both primary Si particle and eutectics can be attributed to the interaction between B and Si elements during the solidification process.
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