加热到较低温度时的热记忆衰退：多晶NiFeGa带的实验数据和二维统计模型预测
Thermal memory fading by heating to a lower temperature: experimental data on polycrystalline NiFeGa ribbons and 2D statistical model predictions
摘要：
已知记忆合金记忆一个或几个温度，在该温度下马氏体-奥氏体转变在过去完成之前停止，该记忆表现为随后的量热扫描中的特定下降。以前的研究表明，这种记忆可以通过加热到比以前记录的更高的温度来消除。在本文中，我们研究了一个明显的记忆衰退效应，这发生在加热到较低的温度。这种效应在NiFeGa多晶薄带中有报道，该合金最初是作为未发现热记忆效应的块体进行研究的。如果在初始不完全加热到T1之后，进行第二次不完全加热到T2<T1，则如预期的那样，在T2处出现新的量热下降，而较少预期的是对应于T1的下降幅度减小或甚至消失（如果在T2处的停止被重复）。记忆衰退效应对于小的差异T1-T2更明显，而对于大的差异不太明显或不存在。论文的第二部分采用了一个统计的二维模型，它将记忆的温度与某些马氏体板尺寸的耗尽相关联，并且也支持记忆衰退效应。
英文摘要：
Shape memory alloys are known to memorise one -or several- temperatures at which the martensite-austenite transformation was stopped before completion in the past, the memory manifesting as specific dips in subsequent calorimetric scans. Previous studies have shown that this memory can be erased by heating to higher temperatures than the ones previously recorded. In this paper, we study a distinct memory fading effect which takes place by heating to a lower temperature. This effect is reported in NiFeGa as polycrystalline ribbons, the alloy being initially studied as bulk for which the thermal memory effect was not found. If, after an initial incomplete heating up to T1 one performs a second incomplete heating up to T2<T1, a new calorimetric dip appears at T2, as expected, while less expected was that the dip corresponding to T1 reduces in amplitude or even vanishes (if the arrest at T2 is repeated). The memory fading effect is more clear for small differences T1-T2 and less obvious or absent for large ones. The second part of the paper employs a statistical 2D model, which associates the memorized temperatures with a depletion of certain martensite plates sizes, and also supports the memory fading effect.
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