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首页> 外文期刊>Shape memory and superelasticity >49Ni 21Ga 30 Shape Memory Alloy Single Crystals]]>
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49Ni 21Ga 30 Shape Memory Alloy Single Crystals]]>

机译：<！[CDATA [原位中子衍射分析应力诱导的相变和马氏体弹性在[001] - oriented CO <下标> 49 Ni <下标> 21 GA <下标> 30 形状记忆合金单晶]]]>

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摘要

Recent studies demonstrated excellent pseudoelastic behavior and cyclic stability under compressive loads in [001]-oriented Co–Ni–Ga high-temperature shape memory alloys (HT-SMAs). A narrow stress hysteresis was related to suppression of detwinning at RT and low defect formation during phase transformation due to the absence of a favorable slip system. Eventually, this behavior makes Co–Ni–Ga HT-SMAs promising candidates for several industrial applications. However, deformation behavior of Co–Ni–Ga has only been studied in the range of theoretical transformation strain in depth so far. Thus, the current study focuses not only on the activity of elementary deformation mechanisms in the pseudoelastic regime up to maximum theoretical transformation strains but far beyond. It is shown that the martensite phase is able to withstand about 5% elastic strain, which significantly increases the overall deformation capability of this alloy system. In situ neutron diffraction experiments were carried out using a newly installed testing setup on Co–Ni–Ga single crystals in order to reveal the nature of the stress–strain response seen in the deformation curves up to 10% macroscopic strain.
机译：最近的研究表明，在 - 施加的Co-Ni-Ga高温形状记忆合金（HT-Smas）中，在压缩载荷下表现出优异的伪弹性行为和循环稳定性。由于没有良好的滑动系统，窄应力滞后与在相变期间在室转换期间抑制脱绒和低缺陷形成有关。最终，这种行为使得若干工业应用的共同NI-GA HT-SMA是有希望的候选人。然而，到目前为止，仅在理论转化应变范围内研究了Co-Ni-Ga的变形行为。因此，目前的研究不仅重点侧重于伪弹性方案中的基本变形机制的活性，其达到最大理论转化株但远远超过。结果表明，马氏体相能承受大约5％的弹性应变，这显着提高了该合金系统的整体变形能力。在原位中子衍射实验中使用新安装的测试设置在CO-Ni-GA单晶上进行，以揭示在变形曲线中看到的应力 - 应变响应的性质高达10％的宏观菌株。

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