Hypereutectic Al-Si Alloy Tube with Gradient Structure Produced by Rheo-Squeeze Casting

Abstract:

In this paper, the wear property of a rheo-squeeze casting Al-22Si-2Fe-1.4Mn alloy tube was investigated. The semi-solid slurry of Al-22Si-2Fe-1.4Mn alloy was prepared using segmented cooling plates. The results showed that the volume fraction and equivalent diameter of the hard particles (primary silicon and blocky Fe-rich phases) increased gradually from the outside to the inside of the tube wall. The microstructures of the tube were examined with an optical microscope, scanning electron microscope, X-ray diffraction. The micro-hardness of hard particles and the macro-hardness from the outside to the inside of the wall were tested, respectively. Wear resistance tests of the outside and the inside of the wall showed wear resistance, which depends on the distribution and the volume fraction of the hard particles, increased gradually from the outside to the inside of the tube wall, changed in gradient and agreeing with the distribution law of macro-hardness.

• Periodical: Solid State Phenomena (Volumes 217-218)
• Pages: 461-467
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.217-218.461
• Online since: September 2014
• Authors: Rong Zhou*, Lu Li, Ye Hua Jiang, Rong Feng Zhou, Jia Wang
• Keywords: Cooling Slope, Hardness, Hypereutectic Al-Si Alloy, Squeeze Casting, Wear Resistance

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