Temperature memory effect in Cu–Al–Ni shape memory alloys studied by adiabatic calorimetry

Rodríguez‐Aseguinolaza, Javier; Ruiz‐Larrea, I.; Nó, M.L.; López‐Echarri, A.; Juan, J. San

doi:10.1016/j.actamat.2008.04.010

Cited by 31 publications

(30 citation statements)

References 43 publications

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“…Unlike what has been observed in similar alloys [32,33] where only a b 0 3 $ b 3 transformation is found, the specific heat experiments on CAN2 do not present the reproducibility observed in the former alloys. As regards the first Fig.…”

Section: Kinetics Of a Mixed Reverse Transformationcontrasting

confidence: 82%

“…A detailed description of this calculus is given in Ref. [33]. In this crystal, a slight discrepancy between the theoretical and the experimental C p data is found between 100 and 180 K, which can be ascribed to differences in the phonon spectrum of the alloy with respect to the individual metals.…”

Section: Kinetics Of a Mixed Reverse Transformationmentioning

confidence: 93%

“…b 3 MT, the selected arrested temperature was T a = 255 K. As described in detail in Ref. [33], the experimental setup permits an asymptotical approach to T a to avoid temperature gradients and the spreading of the arrested temperature throughout the sample. After the total MT is recovered by cooling, the following heating run shows the characteristic additional C p peak (in this case at T = 259 K) and confirms the presence of TME in the b 0 3 !…”

Section: Temperature Memory Effect In the Mixed Transformationmentioning

confidence: 99%

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Kinetic effects in the mixed β to β3′+γ3′ martensitic transformation in a Cu–Al–Ni shape

Rodríguez‐Aseguinolaza

Ruiz‐Larrea

Nó

et al. 2010

Acta Materialia

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Section: Kinetics Of a Mixed Reverse Transformationcontrasting

confidence: 82%

Section: Kinetics Of a Mixed Reverse Transformationmentioning

confidence: 93%

Section: Temperature Memory Effect In the Mixed Transformationmentioning

confidence: 99%

See 1 more Smart Citation

Kinetic effects in the mixed β to β3′+γ3′ martensitic transformation in a Cu–Al–Ni shape

Rodríguez‐Aseguinolaza

Ruiz‐Larrea

Nó

et al. 2010

Acta Materialia

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“…Previously this phenomenon was named thermal arrest memory effect (Ref 3) or step-wise martensite to austenite reversible transformation (Ref 4,5), and recently it was named temperature memory effect (TME) (Ref 6). This new memory effect was extensively investigated in TiNi-based alloy (Ref 7-12) and copper-based SMAs ( Ref 13,14).…”

Section: Introductionmentioning

confidence: 99%

Effects of Thermal Cycling on the Temperature Memory Effect of TiNiNb Alloy

Jiang

Cui

Zheng

et al. 2009

J. of Materi Eng and Perform

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The temperature memory effect (TME) of a Ti 48 Ni 17 Nb 35 alloy consisting of B2-TiNi(Nb) and bcc-NbTi with Ti 2 Ni precipitation was investigated by using differential scanning calorimetry (DSC). Results showed that the TME of the alloy persisted on the second global DSC heating curve. This repeatable TME persisted even after 30 complete thermal cycles from below M f to above A f . With a further 30 incomplete thermal cycles upon heating up to a specific arrested temperature, the TME was enhanced and persisted in the next 32 complete testing cycles. This is different from the previous understanding that TME was a one-time phenomenon.

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“…The TME was firstly reported in thermally induced phase transformation in TiNi alloys [5], but then the TME has been reported in many other types of shape memory alloys [6][7][8][9][10][11][12][13]. The TME can be reinforced by the repetition of the partial heating up to T s (the so-called 'hammer' procedure) [14]. TME is also generally regarded as one-time phenomenon, i.e.…”

Section: Introductionmentioning

confidence: 99%

Review on the temperature memory effect in shape memory alloys

Wang

2011

International Journal of Smart and Nano Materials

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Shape memory alloys (SMAs) are well known for their unique shape memory effect (SME) and superelasticity (SE) behavior. The SME and SE have been extensively investigated in past decades due to their potential use in many applications, especially for smart materials. The unique effects of the SME and SE originate from martensitic transformation and its reverse transformation. Apart from the SME and SE, SMAs also exhibit a unique property of memorizing the point of interruption of martensite to parent phase transformation. If a reverse transformation of a SMA is arrested at a temperature between reverse transformation start temperature (A s ) and reverse transformation finish temperature (A f ), a kinetic stop will appear in the next complete transformation cycle. The kinetic stop temperature is a 'memory' of the previous arrested temperature. This unique phenomenon in SMAs is called temperature memory effect (TME). The TME can be wiped out by heating the SMAs to a temperature higher than A f . The TME is a specific characteristic of the SMAs, which can be observed in TiNi-based and Cu-based alloys. TME can also occur in the R-phase transformation. However, the TME in the R-phase transformation is much weaker than that in the martensite to parent transformation. The decrease of elastic energy after incomplete cycle on heating procedure and the motion of domain walls have significant contributions to the TME. In this paper, the TME in the TiNi-based and Cu-based alloys including wires, slabs and films is characterized by electronic-resistance, elongation and DSC methods. The mechanism of the TME is discussed.Keywords: temperature memory effect; shape memory alloys IntroductionShape memory alloys (SMAs) have attracted considerable interest as potential candidates for novel engineering and mechanical applications owing to their excellent functional properties, i.e. shape memory effect (SME) and superelasticity (SE) behavior. The unique effects of SME and SE originate from martensitic transformation and its reverse transformation. SMAs also exhibit a unique property of memorizing the point of interruption during transformation from martensite to parent phase. An incomplete thermal cycle upon heating of SMAs (arrested at a temperature T s between austenite transformation start and finish temperatures, A s and A f ) induced a kinetic stop in the next complete thermal cycle. The kinetic stop temperature is closely related to the previous arrested temperature. Therefore, this phenomenon is named the temperature memory effect (TME) [1].

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Temperature memory effect in Cu–Al–Ni shape memory alloys studied by adiabatic calorimetry

Cited by 31 publications

References 43 publications

Kinetic effects in the mixed β to β3′+γ3′ martensitic transformation in a Cu–Al–Ni shape

Kinetic effects in the mixed β to β3′+γ3′ martensitic transformation in a Cu–Al–Ni shape

Effects of Thermal Cycling on the Temperature Memory Effect of TiNiNb Alloy

Review on the temperature memory effect in shape memory alloys

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