Temperature memory effect of Ti50Ni30Cu20 (at.%) alloy

Li, Yonghua; Rong, Lijian; Wang, Zhongtang; Qi, Guangxia; Wang, Chengzhi

doi:10.1016/j.jallcom.2005.03.060

Cited by 30 publications

(26 citation statements)

References 25 publications

(27 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…After cooling down again below the martensite finish temperature (M f ), the next complete reverse martensitic transformation up to A f , shows a neat delay to higher temperatures. As can be observed in calorimetric measurements [7][8][9][10], this delay is characterized by the presence of a secondary C p peak just above T a . This effect is reinforced by the repetition of the partial heating runs to T a (the so-called ''hammer'' procedure) [11,12].…”

Section: Introductionmentioning

confidence: 75%

The influence of partial cycling on the martensitic transformation kinetics in shape memory alloys

Rodríguez‐Aseguinolaza

Ruiz‐Larrea

Nó

et al. 2009

Intermetallics

View full text Add to dashboard Cite

Section: Introductionmentioning

confidence: 75%

The influence of partial cycling on the martensitic transformation kinetics in shape memory alloys

Rodríguez‐Aseguinolaza

Ruiz‐Larrea

Nó

et al. 2009

Intermetallics

View full text Add to dashboard Cite

“…26 37 87 55 7.16 0.277 [23] Ni 50 Ti 45 Ta 5 44 76 53 7.05 0.255 [14] Ni 48 Ti 50 W 2 55 70 29 6.92 0.266 [22] Ni 50 Ti 47 Ta 3 58 90 48 7.03 0.264 [14] Ni 30 Ti 50 Cu 20 58 60 6 7.20 0.285 [28] Ni 25 [24] Ni 48 Ti 50 Au 2 75 --7.02 0.268 [13] Ni 29 Ti 51 Pd 20 85 -20 6.94 0.243 [31] Ni 49.5 Ti 40.5 Zr 10 90 170 68 6.97 0.260 [11] Ni 30 Ti 50 Pd 20 90 7.00 0.244 [4] Ni 40 Ti 50 Pt 10 90 100 20 7.00 0.233 [38] Ni 26.5 Ti 51 Pd 22.5 95 -6.94 0.239 [31] Ni 50 Ti 40 Hf 10 120 165 65 7.00 0.233 [24] Ni 40 [38] Ni 20 Ti 50 Pt 30 560 594 55 7.00 0.176 [39] Ni 15 Ti 50 Pt 35 680 750 -7.00 0.164 [38] Ni 10 Ti 50 Pt 40 810 850 -7.00 0.155 [38] Ni 5 Ti 50 Pt 45 900 950 -7.00 0.145 [38] temperature data are scattered with no clear tendency with respect to e v /a (Fig. 1), and 3) e v /a > 7.2 in which M s and A s temperatures both slightly decrease with increasing e v /a.…”

Section: E V /A 6 ¼mentioning

confidence: 99%

Dependence of Transformation Temperatures of NiTi‐based Shape‐Memory Alloys on the Number and Concentration of Valence Electrons

Zarinejad

Liu

2008

Adv Funct Materials

148

105

View full text Add to dashboard Cite

Dependence of transformation temperatures of ternary and quaternary NiTi‐based shape memory alloys on the number (ev/a) and concentration (cv) of valence electrons is investigated. Two distinct trends of transformation temperatures with respect to the number of valence electrons per atom are found depending on whether ev/a = 7 or ev/a ≠ 7. Clear correlations between transformation temperatures and cv exist. Ms and As decrease consistently from 900 to −100 °C, and 950 to −30 °C, respectively, with increasing cv from 0.145 to 0.296. The relationship of electron concentration on the elastic moduli of the NiTi‐based alloys is discussed. The possible influence of the atomic size of alloying elements on transformation hysteresis is introduced.

show abstract

“…Some attempts to describe these phenomena have been published in recent years [16,[41][42][43][44], which attribute the observed behavior to different mechanisms such as changes in the crystal elastic energy, dislocation structure, motion of domains, interfaces interaction, etc.…”

Section: Discussionmentioning

confidence: 99%

Review on the temperature memory effect in shape memory alloys

Wang

2011

International Journal of Smart and Nano Materials

View full text Add to dashboard Cite

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].

show abstract

Temperature memory effect of Ti50Ni30Cu20 (at.%) alloy

Cited by 30 publications

References 25 publications

The influence of partial cycling on the martensitic transformation kinetics in shape memory alloys

The influence of partial cycling on the martensitic transformation kinetics in shape memory alloys

Dependence of Transformation Temperatures of NiTi‐based Shape‐Memory Alloys on the Number and Concentration of Valence Electrons

Review on the temperature memory effect in shape memory alloys

Contact Info

Product

Resources

About