论文标题
马氏体转换的速度限制是多少？
What is the speed limit of martensitic transformations?
论文作者
论文摘要
结构性马塞氏岩转换实现了各种应用，从高冲程致动，传感到节能的磁化制冷和热磁能收集。所有这些新兴应用程序都受益于快速转换，但是直到现在，尚未探索马氏体转换的速度限制。在这里，我们证明了马氏体对奥斯丁岩的转化可以在十个纳秒不足的情况下完成。我们用激光脉冲加热外延的Ni-MN-GA膜，并使用同步加速器衍射来探测初始样品温度的影响并过热对转化速率和比率。我们证明，热能的增加可以更快地驱动这种转换。尽管观察到的速度极限为2.5 x 10^{27}（js）^{ - 1}每个单位单元格为进一步加速应用留出足够的空间，但我们的分析表明，实际限制将是切换所需的能量。我们的实验揭示了与微电子类似的Margolus-Levitin定理表达的Martensitic Transformiss遵守类似的速度极限。
Structural martensitic transformations enable various applications, which range from high stroke actuation and sensing to energy efficient magnetocaloric refrigeration and thermomagnetic energy harvesting. All these emerging applications benefit from a fast transformation, but up to now the speed limit of martensitic transformations has not been explored. Here, we demonstrate that a martensite to austenite transformation can be completed in under ten nanoseconds. We heat an epitaxial Ni-Mn-Ga film with a laser pulse and use synchrotron diffraction to probe the influence of initial sample temperature and overheating on transformation rate and ratio. We demonstrate that an increase of thermal energy drives this transformation faster. Though the observed speed limit of 2.5 x 10^{27} (Js)^{-1} per unit cell leaves plenty of room for a further acceleration of applications, our analysis reveals that the practical limit will be the energy required for switching. Our experiments unveil that martensitic transformations obey similar speed limits as in microelectronics, which are expressed by the Margolus-Levitin theorem.
