标题：Distribution of TiB _2 particles and its effect on the mechanical properties of A390 alloy
作者：Li, P.;Li, Y.;Wu, Y.;Ma, G.;Liu, X.
作者机构：Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Ji
来源：Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing
关键词：Edge-to-edge model;Hypereutectic Al-Si alloy;Mechanical property;Primary Si;TiB _2
摘要：The hypereutectic Al-Si (A390) matrix composite reinforced with TiB _2 particles was successfully prepared by Al melt reaction method. In the composite, TiB _2 particles have a size range from 0.5 to 1.5μm and a block-like morphology. Some TiB _2 particles are inside the primary Si, suggesting that they were engulfed during solidification. It is considered that TiB _2 particles tend to be adsorbed into the primary Si, because of their high surface energy and strong adsorbability. Crystallographic analysis of TiB _2 and Si was carried out with the edge-to-edge model. It is found that there exists good lattice matching coherence, which belongs to the matching planes and directions, 1 1 2Si/1 0 1? 0TiB2, 1 1 1Si/0 0 0 1TiB2. Furthermore, with 3wt% TiB _2 particles addition, the mechanical properties of the base alloy, including the ultimate tensile strength at 300°C, percentage elongation and wear resistance, have been obviously improved.