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首页> 外文期刊>Physica status solidi, B. Basic research >Effect of annealing on stress-induced transformation behaviors at low temperatures in a Ti-51.8 at.% Ni shape memory alloy
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Effect of annealing on stress-induced transformation behaviors at low temperatures in a Ti-51.8 at.% Ni shape memory alloy

机译：退火对Ti-51.8 at。％Ni形状记忆合金在低温下应力诱导相变行为的影响

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摘要

For polycrystalline Ti-51.8Ni (at.%) specimens annealed at; 473 and 943 K, the microstructures at room temperature were observed by transmission electron microscopy and the stressinduced transformation behaviors at low temperatures were investigated by compressive test. The precipitation of Ti_3Ni_4 was confirmed in the both annealed specimens, where the precipitates at 943K had a lenticular shape in micrometer size, and those at 473K seemed to be clusters in nanometer size. Superelasticity with almost complete shape recovery was detected at temperatures below 200K for all the annealed specimens. In comparison to the as-homogenized specimen, although the temperature dependence on the stress hysteresis only slightly changed in each annealing condition, the equilibrium stresses in the specimen annealed at 473 and 943K apparently increased and decreased, respectively.
机译：对于多晶Ti-51.8Ni（at。％）样品，退火温度为50℃;在473和943 K下，通过透射电子显微镜观察了室温下的微观结构，并通过压缩试验研究了在低温下应力诱导的转变行为。在两个退火样品中均确认到Ti_3Ni_4的沉淀，其中943K处的沉淀物呈微米级的柱状形状，而473K处的沉淀物呈纳米级的簇状。在低于200K的温度下，所有退火的样品都具有几乎完全恢复形状的超弹性。与均质样品相比，尽管在每种退火条件下温度对应力滞后的依赖性仅略有变化，但在473和943K退火的样品中的平衡应力却分别明显增加和减少。

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