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首页> 外文会议>6th Japan-France Materials Science Seminar JFMSS-6 on Microstructural Design for Improved Mechanical Behaviour of Advanced Materials Oct 4-6, 1999, Poitiers, France >Martensitic transition of Cu-13.2AI-3Ni (wt.) shape memory alloy studied by isothermal mechanical spectrometry
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Martensitic transition of Cu-13.2AI-3Ni (wt.) shape memory alloy studied by isothermal mechanical spectrometry

机译：等温力学分析研究Cu-13.2Al-3Ni（wt。％）形状记忆合金的马氏体转变

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摘要

Anelastic and elastic properties of polycristalline Cu-13.2Al-3Ni (wt.%) samples have been studied both during the transition and in the martensitic state. In order to eliminate any transient effect, the measurements have been performed in isothermal conditions over a large frequency range (10~(-3) Hz to 40 Hz) for temperatures between 293 K and 473 K. The damping determined at low frequency exhibits peculiar behaviour. First, an high damping level has been measured in the as quenched state. Then, ageing in the martensitic phase leads to the irreversible diminishing of the internal friction. This effect has been ascribed to the pinning of the variant interfaces by quenched vacancies. A second important result indicates that the direct transition (austenite → martensite) manifests by a sharp increase of the damping while the reverse transition (martensite → austenite) does not affect the internal friction all along the heating. These effects, compared to those previously observed on NiTi alloys, have been attributed to the freeze of the interface mobility by interactions with structural defects. Complementary MET study has pointed out a likely role of the dislocations and/or NiAl precipitates in the freezing process.
机译：在过渡过程中和马氏体状态下都研究了多晶体Cu-13.2Al-3Ni（wt。％）样品的弹性和弹性。为了消除任何瞬态影响，已在293 K和473 K之间的较大频率范围（10〜（-3）Hz至40 Hz）的等温条件下进行了测量。低频确定的阻尼表现出独特的特性行为。首先，在淬火状态下测得高阻尼水平。然后，马氏体相中的时效导致内摩擦的不可逆减小。这种作用已归因于通过淬火空位来固定变体界面。第二个重要结果表明，直接转变（奥氏体→马氏体）表现为阻尼的急剧增加，而反向转变（马氏体→奥氏体）并不影响加热过程中的内部摩擦。与以前在NiTi合金上观察到的结果相比，这些作用归因于与结构缺陷的相互作用导致界面迁移率的冻结。 MET的补充研究指出了位错和/或NiAl沉淀物在冷冻过程中的可能作用。

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