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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加载卸载图参数的Mechancyclic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°C 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。％）形状记忆合金通过冷拉伸和在550-600℃下的变形退火，在p阶段形成纳米脲结构。使用“装载卸载”模式的循环机械测试在每个半周期中具有2％的拉伸应变，揭示了在第一循环中的两种合金的非完美超弹性行为，这在进一步的机械织物期间变得完美。年轻的热机理处理合金的模量低（约45GPa），在机械织物（n = 10次循环）下降至25-35GPa期间减少，接近杨氏模量的皮质骨组织。在第10循环中获得的杨氏模量是稳定的或仅在室温下进一步的40天暂停时略微变化，然后在重复的机械织物期间略微发生变化。每个循环的残余菌株，转化屈服应力和机电织物期间的机械滞后降低。在室温下为40天的暂停后，它们恢复其初始值。重复的机械织核来伴随着这些参数的重复降低。

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