In order to further strengthen TiB whiskers reinforced Ti6Al4V (TiBw/Ti6Al4V) composites with a network microstructure, tungsten inert gas (TIG) remelting was performed on the composites with different reinforcement volume fractions to tune microstructure. The results showed that the size of network unit and TiB whisker reinforcement of the composites were significantly refined from 150 μm to 20 μm in diameter and 3 μm to 0.5 μm in width after remelting, respectively. Moreover, the α phase of Ti6Al4V matrix was transformed into a refined α′ phase due to the rapid air-cooling process. It is also revealed that the refinement of network microstructure was resulted from the hypoeutectic reaction of the Ti–B system. However, the network microstructure disappeared when the reinforcement volume fraction rises to 10 vol.%, and then coarse primary TiBw appeared when to 20 vol.%. After remelting, the hardnesses of 3.4 vol.%, 10 vol.%, 15 vol.% and 20 vol.% TiBw/Ti6Al4V composites were increased to HRC 36, HRC 40, HRC 43 and HRC 50 from HRC 32, HRC 37, HRC 40, HRC 47, respectively. The tensile strength at 600 °C was increased by 10%–20% while remaining the similar tensile ductility. The strengthening mechanisms can be mainly attributed to microstructure refinement and α’ martensite formation.

为了进一步增强具有网络微结构的TiB晶须增强的Ti6Al4V（TiBw / Ti6Al4V）复合材料，对具有不同增强体积分数的复合材料进行了钨极惰性气体（TIG）重熔，以调节微结构。结果表明，重熔后，复合材料的网络单元尺寸和TiB晶须增强尺寸分别从直径150μm至20μm和宽度3μm至0.5μm显着细化。此外，由于快速的空气冷却过程，Ti6Al4V基体的α相转变为精细的α'相。还揭示了网络微观结构的细化是由Ti-B系统的亚共晶反应引起的。但是，当增强体积分数增加到10 vol。％时，网络微观结构消失了，然后，当达到20％（体积）时，粗TiBw出现。重熔后，TiBw / Ti6Al4V复合材料的硬度分别为3.4％，10％，15％和20％，由HRC 32，HRC 37增加到HRC 36，HRC 40，HRC 43和HRC 50。分别为HRC 40，HRC 47。600°C时的拉伸强度提高了10％–20％，同时保持了类似的拉伸延展性。强化机理主要归因于组织细化和α'马氏体的形成。