Abstract
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.
Highlights
Novel Ti6Al4V alloy matrix composites with a controllable two-scale network architecture were successfully fabricated by reaction hot pressing (RHP)
Ti5Si3 particles precipitated during the cooling process, due to the decreased solubility of Si element in the βphase
All the results show that the tensile properties of the (Ti5Si3 +TiB whiskers (TiBw))/Ti6Al4V composite with a two-scale network architecture are superior over those of the Ti5Si3/ Ti6Al4V, TiBw/Ti6Al4V and hybrid-reinforced (TiBw +TiC particles (TiCp))/Ti6Al4V composites with a one-scale structure
Summary
Novel Ti6Al4V alloy matrix composites with a controllable two-scale network architecture were successfully fabricated by reaction hot pressing (RHP). Among various manufacturing methods of DRTMCs, a combination of reaction hot pressing (RHP) and in-situ technology has been widely investigated and developed, because of its near net-shape processing and low cost, especially its ability to make composites obtain superior mechanical properties, clean interface and strong interface bonding[3]. In considerable amount of literatures studying DRTMCs, in-situ TiB whisker (TiBw)[4,5,6] and TiC particles (TiCp)[7,8] have been unanimously considered as the best reinforcements, due to their desirable properties, such as high strength, modulus, good chemical stability and similar coefficient of thermal expansion (CTE) with Ti matrix. The large network structure limits reinforcement fraction, which restricted further improvement in the strength of composites
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