Precipation of TiAl3 in remelting Al-5Ti-1B and the grain refinement of 7050 alloy

Abstract This paper studies the precipitation regularity of TiAl 3 compound in different temperature, holding time and cooling rate. Besides, this influence Al-5Ti-1B on mechanical properties 7050 alloy such as aluminum grain size, microstructure strength through changing amount Al-5Ti-1B. Through water cooling, solute Ti forms new fine compounds firstly. While natural is easy to grow up around agglomerate compounds. The variation undissolved follows: size block-like does not change at 700 °C for 10 min; while has stabilized 750 5 min. dissolution rod-like obvious when 20 min, but fuses easily. After adding into alloy, shape α -Al changes from dendritic crystal equiaxed crystal, refining effect obvious; increases, become larger, it a tendency towards crystal. without worst condition. Transcrystalline rupture may occur tensile test due coarse grain. refiner, are optimal keeping temperature Dimple could be found fracture, dimples mainly equiaxial.