The Effect of Annealing Treatment on the Microstructure and Texture of a Cold-Rolled TiNiFe Shape Memory Alloy Tube

The effect of annealing treatment on the microstructure and texture of a Ti50Ni47Fe3 shape memory alloy tube was studied. The results show that the recrystallization process of a cold-rolled Ti50Ni47Fe3 alloy tube occurs at 600 degrees C. The microstructure changes from long striped grains to equiaxed recrystallized grains. The main texture of the alloy tube is the fiber texture < 111 > parallel to RD. With the increase in the annealing temperature, the crystal orientation of the alloy gradually turned to (111)< 112 >, and a series of secondary textures were distributed along the gamma orientation line when the alloy was annealed at a lower temperature (450 similar to 600 degrees C). When the alloy was annealed at 650 degrees C, the growth of recrystallized grains made the grain orientation change, which led to the weakening of the gamma-fiber texture and the formation of recrystallization textures.