The contact reaction method was employed to prepare TiC p/2024Al composites and the semi solid extrusion was employed to manufacture composite rods. Through many experiments, suitable processing parameters were obtain...The contact reaction method was employed to prepare TiC p/2024Al composites and the semi solid extrusion was employed to manufacture composite rods. Through many experiments, suitable processing parameters were obtained, under which sound rods can be fabricated. It is found from the extrusion pressure—stroke curves of semi solid extrusion that the deformation force during semi solid extrusion is low and steady. The reason for lower extrusion pressure of semi solid extrusion was given. Some fabrication defects, such as break out and excessive extrusion force, owing to the inappropriate selection of processing parameters were also observed. The microstructures of TiCp/2024Al composites are characterized by well densified matrix, uniformly distributed TiC particles, some banded particle clusters and realignment of TiC particles along the extrusion direction, and no fracture of TiC particles. The mechanical properties of TiC p/2024Al composites are much higher than those of unreinforced alloy. In the meantime, the elongations of the composites are maintained at the level enough for practical applications.展开更多
The internal friction and the damping behaviors of in situ TiC p/2024 composites have been investigated in comparison with those of 2024 matrix alloy. The results showed that the damping properties of the TiC p/2024 c...The internal friction and the damping behaviors of in situ TiC p/2024 composites have been investigated in comparison with those of 2024 matrix alloy. The results showed that the damping properties of the TiC p/2024 composites are superior to those of the matrix alloy and increase with increasing temperature and volume fraction of TiC. It was found that the damping properties were sensitive to frequency and temperature, and the dislocation damping and interface damping were the main factors which influence the damping behaviors of the composites. When the temperature was lower than 200 ℃, the dislocation damping was the main factor; when the temperature was higher than 200 ℃, the interface and boundary damping was the main factor.展开更多
文摘The contact reaction method was employed to prepare TiC p/2024Al composites and the semi solid extrusion was employed to manufacture composite rods. Through many experiments, suitable processing parameters were obtained, under which sound rods can be fabricated. It is found from the extrusion pressure—stroke curves of semi solid extrusion that the deformation force during semi solid extrusion is low and steady. The reason for lower extrusion pressure of semi solid extrusion was given. Some fabrication defects, such as break out and excessive extrusion force, owing to the inappropriate selection of processing parameters were also observed. The microstructures of TiCp/2024Al composites are characterized by well densified matrix, uniformly distributed TiC particles, some banded particle clusters and realignment of TiC particles along the extrusion direction, and no fracture of TiC particles. The mechanical properties of TiC p/2024Al composites are much higher than those of unreinforced alloy. In the meantime, the elongations of the composites are maintained at the level enough for practical applications.
文摘The internal friction and the damping behaviors of in situ TiC p/2024 composites have been investigated in comparison with those of 2024 matrix alloy. The results showed that the damping properties of the TiC p/2024 composites are superior to those of the matrix alloy and increase with increasing temperature and volume fraction of TiC. It was found that the damping properties were sensitive to frequency and temperature, and the dislocation damping and interface damping were the main factors which influence the damping behaviors of the composites. When the temperature was lower than 200 ℃, the dislocation damping was the main factor; when the temperature was higher than 200 ℃, the interface and boundary damping was the main factor.
