Transformation Sequence Rule of Martensite Plates and Temperature Memory Effect in Shape Memory Alloys

doi:10.1007/s40195-015-0324-7

Abstract

Abstract:

In thermoelastic martensitic transformation, it is well established that the first martensite plate appearing upon cooling becomes the final one during reverse transformation to austenite upon heating. The results obtained from this work show that the transformation sequence of the martensite appears to be random. Newly formed martensite plates can modify the elastic strain energy level stored in the already existing martensite. Additionally, the elastic strain energy stored in newly formed martensite is not necessarily to be higher than the remaining martensite. The obtained results may assist in understanding phenomena related to partial transformation of shape memory alloys, such as temperature memory effect.

Key words: Phase transformation, Shape memory alloys, TEM, Transformation sequence

Tian-Wei Liu, Yan-Jun Zheng, Li-Shan Cui. Transformation Sequence Rule of Martensite Plates and Temperature Memory Effect in Shape Memory Alloys[J]. Acta Metallurgica Sinica (English Letters), 2015, 28(10): 1286-1290.

Figures/Tables 4

Fig. 1 Surface relief of NiTi polycrystalline specimen during cooling. a At 238.0 K, in full austenite state, b the plate A appeared at 236.0 K, c the plate B appeared at 234.0 K, d the plate C appeared at 232.0 K

Fig. 2 Surface relief of NiTi polycrystalline specimen during heating. a At 266.0 K, b at 268.0 K, where the martensite plates started to disappear, c the plate B disappeared at 270.0 K, d the plate A disappeared at 274.0 K, leaving plate C alone

Fig. 3 Bright-field TEM images of the single-crystal NiTi alloy. The sample was incompletely cycled from 103.00 K (below Mf) to 262.00 K (in between As and Af). a At 262.00 K after the first incomplete transformation cycle, b at 262.00 K after the third incomplete transformation cycle, c, d local magnifications of a and b, respectively

Fig. 4 DSC curves of incomplete martensitic transformation, wherein global curves of complete martensitic transformation are also shown for comparison. a A speculation DSC curve based on the traditional understanding of the elastic strain energy, b DSC curves of incomplete transformation

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