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首页> 外文期刊>Physical review >History-dependent nucleation and growth of the martensitic phase in the magnetic shape memory alloy Ni_(45)Co_5Mn_(38)Sn_(12)
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History-dependent nucleation and growth of the martensitic phase in the magnetic shape memory alloy Ni_(45)Co_5Mn_(38)Sn_(12)

机译：形状记忆合金Ni_（45）Co_5Mn_（38）Sn_（12）中马氏体相的历史依赖形核和生长

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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 different paths in magnetic field H and T space in a shape memory alloy system, Ni_(45)Co_5Mn_(38)Sn_(12). It is shown that these coexisting phases consisting of a fraction of kinetically arrested austenite phase and a remaining fraction of low-T equilibrium martensitic phase undergo a slow relaxation to low magnetization (martensitic) state but with very different thermomagnetic history-dependent rates at the same T and H. We discovered that, when the nucleation of the martensitic phase is initiated at much lower T through the de-arrest of the glasslike arrested state contrasted with the respective first-order transformation (through supercooling at much higher T), the long-time relaxation rate scales with the nonequilibrium phase fraction but has a very weak dependence on T. This is explained on the basis of the H-T path dependent size of the critical radii of the nuclei and the subsequent growth of the equilibrium phase through the motion of the interface.
机译：我们通过磁化的时间演化研究了在形状记忆合金系统Ni_（45）Co_5Mn_（38）Sn_（中穿过磁场H和T空间中的不同路径而创建的亚稳态共存相的低温（T）动力学12）。结果表明，这些共存相由一部分动力学停止的奥氏体相和剩余的一部分低T平衡马氏体相经历缓慢弛豫至低磁化（马氏体）状态，但是在相同的条件下，热磁史相关速率不同T和H。我们发现，当马氏体相的成核在较低的T处通过玻璃状阻滞状态的脱阻而开始时，与相应的一阶转变（通过在较高的T处过冷）相反，则长时间弛豫率与非平衡相分数成比例，但对T的依赖性很弱。这是根据HT路径依赖于原子核临界半径的大小以及随后通过运动的平衡相的增长来解释的。接口。

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  • 来源
    《Physical review》 |2011年第21期|p.214420.1-214420.7|共7页
  • 作者

    A. Banerjee; P. Chaddah; S. Dash Kranti Kumar; Archana Lakhani; X. Chen; R. V. Ramanujan;

  • 作者单位

    UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India;

    UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India;

    UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India;

    UGC-DAE Consortium for Scientific Research, University Campus, Khandwa Road, Indore 452001, Madhya Pradesh, India;

    School of Materials Science and Engineering, Nanyang Technological University, N4.1-01-18, 50 Nanyang Avenue, Singapore 639798;

    School of Materials Science and Engineering, Nanyang Technological University, N4.1-01-18, 50 Nanyang Avenue, Singapore 639798;

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  • 关键词

    magnetic phase boundaries (including magnetic transitions, metamagnetism, etc.); studies of specific magnetic materials;

    机译：磁相边界（包括磁跃迁;超磁性等）;特殊磁性材料的研究;

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