School of Materials Science and Engineering, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, P.O. Box 433, Harbin 150001, P. R. China.
Sci Rep. 2016 Sep 13;6:32991. doi: 10.1038/srep32991.
Novel Ti6Al4V alloy matrix composites with a controllable two-scale network architecture were successfully fabricated by reaction hot pressing (RHP). TiB whiskers (TiBw) were in-situ synthesized around the Ti6Al4V matrix particles, and formed the first-scale network structure (FSNS). Ti5Si3 needles (Ti5Si3) precipitated in the β phase around the equiaxed α phase, and formed the secondary-scale network structure (SSNS). This resulted in increased deformation compatibility accompanied with enhanced mechanical properties. Apart from the reinforcement distribution and the volume fraction, the ratio between Ti5Si3 and TiBw fraction were controlled. The prepared (Ti5Si3 + TiBw)/Ti6Al4V composites showed higher tensile strength and ductility than the composites with a one-scale microstructure, and superior wear resistance over the Ti6Al4V alloy under dry sliding wear conditions at room temperature.
通过反应热压（RHP）成功制备了具有可控两尺度网络结构的新型 Ti6Al4V 合金基复合材料。TiB 晶须（TiBw）在 Ti6Al4V 基体颗粒周围原位合成，并形成了第一尺度网络结构（FSNS）。Ti5Si3 针（Ti5Si3）在等轴 α 相周围的 β 相中析出，并形成了第二尺度网络结构（SSNS）。这导致了变形相容性的提高，同时也提高了机械性能。除了增强体的分布和体积分数外，还控制了 Ti5Si3 和 TiBw 分数之间的比例。所制备的（Ti5Si3+TiBw）/Ti6Al4V 复合材料的拉伸强度和延展性均高于具有单尺度微观结构的复合材料，并且在室温下干滑动磨损条件下的耐磨性优于 Ti6Al4V 合金。
