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Shape memory alloys are known to memorise one -or several- temperatures atwhich the martensite-austenite transformation was stopped before completion inthe past, the memory manifesting as specific dips in subsequent calorimetricscans. Previous studies have shown that this memory can be erased by heating tohigher temperatures than the ones previously recorded. In this paper, we studya distinct memory fading effect which takes place by heating to a lowertemperature. This effect is reported in NiFeGa as polycrystalline ribbons, thealloy being initially studied as bulk for which the thermal memory effect wasnot found. If, after an initial incomplete heating up to T1 one performs asecond incomplete heating up to T2<T1, a new calorimetric dip appears at T2, asexpected, while less expected was that the dip corresponding to T1 reduces inamplitude or even vanishes (if the arrest at T2 is repeated). The memory fadingeffect is more clear for small differences T1-T2 and less obvious or absent forlarge ones. The second part of the paper employs a statistical 2D model, whichassociates the memorized temperatures with a depletion of certain martensiteplates sizes, and also supports the memory fading effect.

Thermal memory fading by heating to a lower temperature: experimental data on polycrystalline NiFeGa ribbons and 2D statistical model predictions