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History dependent nucleation and growth of the martensitic phase in a magnetic shape memory alloy Ni$_{45}$Co$_{5}$Mn$_{38}$Sn$_{12}$

机译:历史依赖的成核和马氏体相的生长   磁性形状记忆合金Ni $ _ {45} $ Co $ _ {5} $ mn $ _ {38} $ sn $ _ {12} $

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摘要

We study through the time evolution of magnetization the low temperature (T)dynamics of the metastable coexisting phases created by traversing differentpaths in magnetic field (H) and T space in a shape memory alloy system,Ni$_{45}$Co$_{5}$Mn$_{38}$Sn$_{12}$. It is shown that these coexisting phasesconsisting of a fraction of kinetically arrested austenite phase and remainingfraction of low-T equilibrium martensitic phase undergo a slow relaxation tolow magnetization (martensitic) state but with very different thermomagnetichistory-dependent rates at the same T and H. We discovered that, when thenucleation of martensitic phase is initiated at much lower T through thede-arrest of the glass like arrested state contrasted with the respective firstorder transformation (through supercooling at much higher T), then the longtime relaxation rate scales with the non-equilibrium phase fraction but has avery weak dependence on T. This is explained on the basis of the H-T pathdependent size of the critical radii of the nuclei and the subsequent growth ofthe equilibrium phase through the motion of the interface.
机译:我们通过磁化的时间演化研究了形状记忆合金系统Ni $ _ {45} $ Co $ _的遍历磁场(H)和T空间中不同路径所产生的亚稳态共存相的低温(T)动力学。 {5} $ Mn $ _ {38} $ Sn $ _ {12} $。结果表明,这些共存的相由一部分动力学停止的奥氏体相和剩余的低T平衡马氏体相组成,经历了缓慢的弛豫以降低磁化(马氏体)状态,但是在相同的T和H下热磁历史依赖的速率却大不相同。发现,当马氏体相的核化通过玻璃的停滞状态在低得多的T处开始时,就像停滞状态与相应的一阶转变(通过在高得多的T处过冷)形成对比时,则长时间弛豫率随非平衡而缩放相分数,但对T的依赖性很弱。这是根据原子核临界半径与HT路径相关的大小以及通过界面运动随后平衡相的增长来解释的。

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