Microstructure and Grain Growth of the Matrix of SiCf/Ti-6Al-4V Composites Prepared by the Consolidation of Matrix-Coated Fibers in the alpha plus beta Phase Field

摘要

Both the microstructural characteristics and the grain growth of the matrix materials in the SiCf/Ti-6Al-4V composites were investigated by means of experimental tests coupled with theoretical assessment. A very fine matrix microstructure was obtained in the SiCf/Ti-6Al-4V composites that were prepared by the consolidation of matrix-coated fiber (MCF) in the alpha+beta phase field. During a fabrication process through the MCF method, the matrix microstructure after consolidation processing will evolve from the columnar crystals to a fully-lamellar microstructure. The experimental results especially the grain sizes of matrix microstructure were reasonably explained based on theoretical calculations.