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Evolution Of Mechanical Properties In Ert_2 Thin Films

机译：Ert_2薄膜力学性能的演变

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摘要

The mechanical properties of rare earth tritide films evolve as tritium decays into ~3He, which forms bubbles that influence long-term film stability in applications such as neutron generators. Ultralow load nanoindentation, combined with finite-element modeling to separate the mechanical properties of the thin films from their substrates, has been used to follow the mechanical properties of model ErT_2 films as they aged. The size of the growing ~3He bubbles was followed with transmission electron microscopy, while ion beam analysis was used to monitor total T and ~3He content. The observed behavior is divided into two regimes: a substantial increase in layer hardness but elasticity changed little over ～ 18 months, followed by a decrease in elastic stiffness and a modest decease in hardness over the final 24 months. We show that the evolution of properties is explained by a combination of dislocation pinning by the bubbles, elastic softening as the bubbles occupy an increasing fraction of the material, and details of bubble growth modes.
机译：tri稀土ide化物薄膜的机械性能会随着into的衰变而转变为〜3He，而气泡会影响中子发生器等应用中薄膜的长期稳定性。超低负荷纳米压痕与有限元建模相结合，可将薄膜的机械性能与其基材分离开来，用于跟踪模型ErT_2薄膜的机械性能。透射电子显微镜观察正在生长的〜3He气泡的大小，同时使用离子束分析监测总T和〜3He含量。观察到的行为分为两种状态：在〜18个月内，层的硬度显着增加，但弹性变化不大；在最后24个月内，弹性刚度降低且硬度适度下降。我们表明，气泡的位错钉扎，气泡在材料中所占比例不断增加的弹性软化以及气泡生长模式的详细说明可以解释性能的演变。

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  • 来源
    《Journal of Applied Physics》 |2009年第5期|134-140|共7页
  • 作者

    J. A. Knapp; J. F. Browning; G. M. Bond;

  • 作者单位

    Sandia National Laboratories, Albuquerque, New Mexico 87185, USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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  • 正文语种 eng
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