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首页> 外文期刊>Journal of Materials Engineering and Performance >X-ray Diffraction Investigations of Shape Memory NiTi Wire
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X-ray Diffraction Investigations of Shape Memory NiTi Wire

机译：形状记忆镍钛丝的X射线衍射研究

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摘要

Outstanding properties of nitinol, known as shape memory and superelasticity, make them suitable alternatives in several biomedical, aerospace, and civil applications. For instance, nitinol wires have been used as the actuator components in many innovative medical devices aiming to make surgical tasks less invasive and more efficient. In most of these applications, it is desired to have a consistent strain response of nitinol wires; therefore, it is necessary to investigate the internal phase transformations from microstructural point of view. In this study, the effect of influencing factors such as biased stress during thermal cycle, the maximum temperature wires experienced during heating part of thermal cycle, and also wire diameters on the amount of unrecovered strain occurred between the first and the second thermal cycles has been investigated. The generation of different phase compositions in the same thermomechanical condition for different wire diameters has been discussed using x-ray diffraction (XRD) method. The location and intensity of characteristic peaks were studied prior and after the loading cycles. It was observed that nitinol wires of diameters less than 0.19 mm exhibit unrecovered strain while heated to the range of 70-80 A degrees C in a thermal cycle, whereas no unrecovered strain was found in wires with larger diameter. The observation was supported by the XRD patterns where the formation of R-phase instead of martensite was shown in wire diameters of less than 0.19 mm after cooling back to room temperature.
机译：镍钛合金的出色特性（称为形状记忆和超弹性）使其成为几种生物医学，航空航天和民用应用的合适替代品。例如，镍钛诺线已被用作许多创新医疗设备中的致动器组件，旨在使外科手术任务更具侵入性且效率更高。在大多数这些应用中，希望使镍钛诺线具有一致的应变响应。因此，有必要从微观结构的角度研究内部相变。在这项研究中，影响因素如热循环中的偏应力，在热循环的加热部分经历的最高温度焊丝以及焊丝直径对在第一和第二热循环之间发生的未恢复应变的量的影响已得到了影响。调查。已经讨论了使用X射线衍射（XRD）方法在相同的热机械条件下针对不同的线径生成不同的相成分。在加载循环之前和之后研究了特征峰的位置和强度。观察到直径小于0.19mm的镍钛合金线材在热循环中加热到70-80 A的温度范围时，表现出未恢复的应变，而在较大直径的线材中未发现未恢复的应变。 XRD图案支持了该观察，其中冷却至室温后，线径小于0.19 mm时显示了R相而不是马氏体的形成。

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