Papers by Author: Song Li Zhang

Abstract: In situ TiB₂/6061 composites have been successfully synthesized through chemical reaction between 6061 master alloy, Al-3B master alloy and Ti powder. The composites fabricated by direct melt mixing method was investigated by Scanning Electron Microscope (SEM), Energy Dispersive x-ray Spectroscopy (EDS) and X-Ray Diffraction (XRD), The results shown the existence of TiB₂ particles. The size of most TiB₂ particles were just in micron level, and even reached to sub-micron level. The increase in microhardness and tensile strength for the as-prepared composites with 5% particulate volume fraction (PVF) are up to 26.8% and 51.2% respectively.

Abstract: In-situ ZrB₂/AZ91 magnesium matrix composite was successfully synthesized with Al/K₂ZrF₆+NH₄BF₄ by Direct Melt Reaction (DMR). The microstructures of the ZrB₂/AZ91 magnesium matrix composite fabricated by direct melt mixing method were investigated. The results show that the size of ZrB₂ particles is less than 1μm and even reaches to 100nm and the shape, amount and size of the β-Mg₁₇Al₁₂ phase in magnesium matrix composite have been greatly changed due to ZrB₂ heterogeneous nuclei.