Texture in CuZnAl Shape Memory Alloys

摘要

The pseudoelastic elongation and the Young's modulus were estimated using texture and orientation dependent properties in the 95.5 percent hot-rolled Cu-14.0 wt percent Zn-8.0 wt percent Al, in the 96.7 percent extruded Cu-17.7 wt percent Zn-7.0 wt percent Al-0.5 wt percent Ti and in the 95 percent cold drawn Cu-27.1 wt percent Zn-4.6 wt percent Al shape-memory-alloys. The textures were measured in martensitic phases, and the austenitic textures were calculated using texture transformation, which gave rise to the maximum possible shape change for a particular application. The maximum value of the pseudoelastic elongation (6.55 percent) was found at the normal direction in the sheet and a minimum value of 2.23 percent at 35 deg from the normal direction to the rolling direction. In the rod and wire, the maximum value 4.80 percent and 5.28 percent were found at 45 deg and 90 deg from the axis direction. The anisotropic constant 1.5, 1.2 and 1.3 of the Young's modulus were found in the sheet, rod and wire, respectively. These values enabled us to estimate the optimum texture for a technological application.