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首页> 外文期刊>Materials Science and Engineering >Improvements in fracture properties of Ni-Ti superelastic alloy in physiological saline solution containing hydrogen peroxide by surface modification
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Improvements in fracture properties of Ni-Ti superelastic alloy in physiological saline solution containing hydrogen peroxide by surface modification

机译：表面改性改善Ni-Ti超弹性合金在含过氧化氢的生理盐水溶液中的断裂性能

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摘要

The fracture properties of surface-modified Ni-Ti superelastic alloy are examined by a sustained tensile-loading test in physiological saline solution containing hydrogen peroxide. The surface modification of the alloy is performed by chemical etching in 35 mass% nitric acid solution at 60℃ for a long time (3 h). By modifying the surface of the specimen, many corrosion pits are formed and the surface roughness increases. When the surface-modified specimen is immersed in the test solution without applied stress, corrosion occurs over the entire specimen and the amount of dissolved nickel ions increases. Nevertheless, under applied stress, the localized corrosion leading to the fracture is inhibited and the fracture mechanism changes, thereby increasing the time to fracture. The effects of the surface modification are confirmed even under applied stress above the critical stress for martensite transformation. The present study suggests that the effectiveness of the surface modification of Ni-Ti superelastic alloy should be investigated not only without applied stress but also under applied stress.
机译：通过在含过氧化氢的生理盐水溶液中进行持续的拉伸载荷试验，检查了表面改性的Ni-Ti超弹性合金的断裂性能。合金的表面改性是通过在35质量％的硝酸溶液中于60℃长时间（3 h）进行化学蚀刻来进行的。通过改变试样的表面，形成许多腐蚀坑并且表面粗糙度增加。当将表面改性的样品浸没在测试溶液中而没有施加应力时，整个样品都会发生腐蚀，并且溶解的镍离子量会增加。然而，在施加应力的情况下，抑制了导致断裂的局部腐蚀并且断裂机理改变，从而增加了断裂时间。即使在高于马氏体相变的临界应力的施加应力下，也可以确认表面改性的效果。本研究表明，不仅应在没有施加应力的情况下，而且在施加应力的情况下，都应研究Ni-Ti超弹性合金表面改性的有效性。

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  • 来源
    《Materials Science and Engineering》 |2009年第2009期|267-275|共9页
  • 作者

    Kenichi Yokoyama; Tokunori Kanemura; Junichi Sakai;

  • 作者单位

    Department of Materials Science and Engineering, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata-ku, Kitakyushu 804-8550, Japan;

    Department of Materials Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;

    Department of Materials Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan Faculty of Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku-ku, Tokyo 169-8555, Japan;

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  • 正文语种 eng
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  • 关键词

    Ni-Ti; nitinol; fracture; corrosion; surface modification; hydrogen peroxide;

    机译：镍钛镍钛诺断裂;腐蚀;表面改性;过氧化氢;

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