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首页> 外文期刊>Journal of Applied Physics >Structural transformations in NiTi shape memory alloy nanowires
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Structural transformations in NiTi shape memory alloy nanowires

机译：NiTi形状记忆合金纳米线的结构转变

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Martensitic phase transformation in bulk Nickle-Titanium (NiTi)—the most widely used shape memory alloy—has been extensively studied in the past. However, the structures and properties of nanostructured NiTi remain poorly understood. Here, we perform molecular dynamics simulations to study structural transformations in NiTi nanowires. We find that the tendency to reduce the surface energy in NiTi nanowires can lead to a new phase transformation mechanism from the austenitic B2 to the martensitic B19 phase. We further show that the NiTi nanowires exhibit the pseudoelastic effects during thermo-mechanical cycling of loading and unloading via the B2 and B19 transformations. Our simulations also reveal the unique formation of compound twins, which are expected to dominate the patterning of the nanostructured NiTi alloys at high loads. This work provides the novel mechanistic insights into the martensitic phase transformations in nanostructured shape memory alloy systems.
机译：过去，对大量使用的形状记忆合金镍钛（NiTi）中的马氏体相变进行了广泛的研究。然而，纳米结构的NiTi的结构和性能仍然知之甚少。在这里，我们进行分子动力学模拟以研究NiTi纳米线的结构转变。我们发现降低NiTi纳米线表面能的趋势可以导致一种新的从奥氏体B2到马氏体B19相的相变机制。我们进一步表明，NiTi纳米线通过B2和B19转换在加载和卸载的热机械循环过程中表现出伪弹性效应。我们的模拟还揭示了复合孪晶的独特形成，预计该复合孪晶将在高负载下主导纳米结构NiTi合金的图案。这项工作为纳米结构形状记忆合金系统中的马氏体相变提供了新颖的力学见解。

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