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Inverse martensitic transformation in Zr nanowires

机译:Zr纳米线中的马氏体逆相变

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摘要

Like martensitic transformations (MTs), inverse martensitic transformations (IMTs) are shear-dominant dif-fusionless transformations, but are driven by reduction in interfacial energies rather than bulk free energies, and exhibit distinctive behavior such as instantaneous initiation (like spinodal decomposition) and self-limiting lengthscale. Bulk Zr metal is known to undergo normal MT from the high-temperature bcc phase to the low-temperature hcp phase. Using molecular dynamics simulations we demonstrate that, unlike in the bulk, an IMT to the bcc structure can occur in (1100)-oriented hcp Zr nanowires at low temperatures, which is driven by the reduction in the nanowire surface energy. The bcc domains subsequently become distorted and transform into a new (1120)-oriented hcp domain, leading to reorientation of the nanowire. This behavior has implications for the study of structural transformations at the nanoscale and surface patterning.
机译:像马氏体转变(MTs)一样,逆马氏体转变(IMT)是剪切为主的无扩散转变,但受界面能而不是体积自由能的减少驱动,并表现出独特的行为,例如瞬时引发(如旋节线分解)和自限长度标尺。已知大块Zr金属会从高温bcc相到低温hcp相经历正常的MT。使用分子动力学模拟,我们证明,与大块体不同,在(1100)取向的hcp Zr纳米线中,低温下会发生bcc结构的IMT,这是由纳米线表面能的降低驱动的。 bcc域随后变形,并转变为新的(1120)取向的hcp域,从而导致纳米线重新定向。这种行为对研究纳米尺度的结构转变和表面图案具有重要意义。

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  • 来源
    《Physical review》 |2010年第24期|P.245433.1-245433.5|共5页
  • 作者单位

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

    State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China Ferroic Physics Group, National Institute for Materials Science, Tsukuba, 305-0047 Ibaraki, Japan;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China;

    rnState Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, China Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA;

    rnTheoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    structural transitions in nanoscale materials;

    机译:纳米级材料的结构转变;

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