Ni-Ti合金超弹性各向异性与再结晶织构 关系

Ni-50.6%Ti alloy have uper-elastic anisotropy. In this study, the effect of recrystallization texture on super-elastic is estimated. First，the paper tested the stress-induced transformation strain at the temperature higher than Af ,The results show that the strain produced along the RD direction is maximum ,and the strain along 45 direction is smaller than the RD direction, and the strain obtained along TD direction is minimum. In the same tensile direction, the maximum strain appeared at 500℃,and the sample perform the best super-elastic properties. Then calculated recoverable strain εiM by parent and martensite lattice constant produced by martensite variant to estimate super-elastic anisotropy. By comparison with the calculation and the experiment results ,the conclusion is drawn as follows: in the same anneal temperature, the strain along RD direction is bigger than TD direction; the maximum stress-induced transformation strain by calculation and measurement appeared at 500℃ and 600℃ respectively; and in the same temperature and direction, the measured transformation strain is smaller than calculated result.