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首页> 外文会议>European symposium on martensitic transformations >Mechanocyclic and Time Stability of the Loading-Unloading Diagram Parameters of Nanostructured Ti-Nb-Ta and Ti-Nb-Zr SMA
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Mechanocyclic and Time Stability of the Loading-Unloading Diagram Parameters of Nanostructured Ti-Nb-Ta and Ti-Nb-Zr SMA

机译：纳米结构Ti-Nb-Ta和Ti-Nb-Zr SMA的装卸图参数的机械循环和时间稳定性

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摘要

The Ti-21.8Nb-6Zr and Ti-19.7Nb-5.8Ta (at.%) shape memory alloys are thermomechanically treated by cold drawing and post-deformation annealing at 550-600℃ forming a nanosubgrained structure in the P-phase. Cyclic mechanical testing using a "loading-unloading" mode with 2% tensile strain in each half-cycle reveals the non-perfect superelastic behavior of both alloys during the very first cycles of testing, which becomes perfect during further mechanocycling. The Young's modulus of thermomechanically-treated alloys is low (about 45 GPa), and it decreases during mechanocycling (n=10 cycles) down to 25-35 GPa, approaching the Young's modulus of cortical bone tissues. The Young's modulus obtained in the 10th cycle is stable or changes only slightly during a further 40-day pause at room temperature and then during repeated mechanocycling. The residual strain per cycle, the transformation yield stress and the mechanical hysteresis decrease during mechanocycling. Subsequent to a 40-day pause at room temperature, they restore their initial values. Repeated mechanocycling is accompanied by a repeated decrease of these parameters.
机译：Ti-21.8Nb-6Zr和Ti-19.7Nb-5.8Ta（at。％）形状记忆合金在550-600℃下通过冷拔和变形后退火进行热机械处理，在P相中形成纳米亚晶结构。使用“加载-卸载”模式的循环机械测试在每个半周期中均具有2％的拉伸应变，这揭示了两种合金在测试的第一个周期中就具有非完美的超弹性，在进一步的机械循环中变得非常完美。经过热机械处理的合金的杨氏模量较低（约45 GPa），并且在机械循环（n = 10个循环）过程中会降低至25-35 GPa，接近皮质骨组织的杨氏模量。在第10个循环中获得的杨氏模量是稳定的，或者在室温下再暂停40天后以及在重复的机械循环过程中仅略有变化。在机械循环过程中，每个循环的残余应变，相变屈服应力和机械滞后减小。在室温下暂停40天后，它们恢复了初始值。重复的机械循环伴随着这些参数的反复降低。

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