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首页> 外文期刊>Journal of Materials Engineering and Performance >Influence of Different Thermo-mechanical Cycling Routes on Recovery Stresses of Annealed NiTi Wires
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Influence of Different Thermo-mechanical Cycling Routes on Recovery Stresses of Annealed NiTi Wires

机译：不同热机械循环路径对退火NiTi丝回复应力的影响

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摘要

In this study, the influence of different thermo-mechanical cycling routes on recovery stresses of annealed NiTi wires has been investigated by using a dynamic mechanical analyzer. The as-received wire was annealed in Argon atmosphere in the temperature range of 350 to 900 degrees C. Differential scanning calorimeter was used to study the martensite transformation. In route I, the sample is deformed to 2% pre-strain and recovery stress is measured after unloading. In route II, the sample undergoes 3% deformation followed by a free shape recovery and then is reloaded to 2% pre-strain and recovery stress is measured after unloading. In route III, the sample undergoes a constrained thermal cycling at 3% pre-strain followed by a free shape recovery and then recovery stress is measured at 2% pre-strain. The results show that both route II and III can improve the recovery stresses. Route III has higher recovery stresses than route II for samples annealed at 550-700 degrees C. The improvements of recovery stresses under route II and III are partly attributed to the decrease of As temperatures after thermo-mechanical cycling. Such information is essential for the proper use of NiTi alloys in smart structures, intelligent controllers, and memory devices.
机译：在这项研究中，已通过使用动态力学分析仪研究了不同的热机械循环路径对退火的NiTi线的恢复应力的影响。将所接收的焊丝在氩气氛中在350至900摄氏度的温度范围内进行退火。使用差示扫描量热仪研究马氏体转变。在路线I中，样品变形至2％的预应变，并在卸载后测量恢复应力。在路线II中，样品经历3％的变形，然后自由恢复形状，然后重新加载至2％的预应变，并在卸载后测量恢复应力。在路线III中，样品在3％的预应变下经历了约束热循环，然后自由恢复形状，然后在2％的预应变下测量了恢复应力。结果表明，途径II和III均可改善恢复应力。对于在550-700℃退火的样品，路线III具有比路线II高的恢复应力。路线II和III下恢复应力的改善部分归因于热机械循环后As温度的降低。这些信息对于在智能结构，智能控制器和存储设备中正确使用NiTi合金至关重要。

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