Effects of frequency, composition, hydrogen and twin boundary density on the internal friction of Ti50Ni50−xCux shape memory alloys

Fan, Genlian; Zhou, Yumei; Otsuka, Kazuhiro; Ren, Xiaobing; Nakamura, Keikichi; Ohba, Takayoshi; Suzuki, Takao; Yoshida, Itsuro; Yin, Fuxing

doi:10.1016/j.actamat.2006.06.018

Cited by 82 publications

(81 citation statements)

References 28 publications

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“…Therefore, most of the internal friction studies of TiNi-based SMAs focus on the damping characteristics of IF Tr . [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] However, for high damping materials, it is more important to consider the damping characteristics of IF PT and IF I since most engineering applications for these materials are used at a constant temperature (especially at room temperature) instead of a constant temperature rate. Here, the term (IF PT +IF I ) is referred to as the inherent internal friction.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18] When heating and cooling TiNi-based SMAs, there is an internal friction (tan ) peak with a storage modulus (E 0 ) minimum corresponding to the martensitic transformation. 5) In addition, it has been reported that the formation of premartensite R-phase in TiNi-based SMAs can strongly soften the storage modulus and thus augment the internal friction during transformation.…”

Section: Introductionmentioning

confidence: 99%

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Inherent Internal Friction of Ti51Ni39Cu10 Shape Memory Alloy

Chang

2007

Mater. Trans.

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Ti 51 Ni 39 Cu 10 SMA is more suitable than Ti 50 Ni 50 SMA for use as a high damping alloy at room temperature because it has higher inherent internal friction and wider martensitic transformation temperature range. Experimental results show that tan values of both (IF PT +IF I ) B2!B19 and (IF PT +IF I ) B19!B19 0 of Ti 51 Ni 39 Cu 10 SMA are linearly proportional to 0 = 1=2 when the applied and 0 are within 10 Hz and 15 mm, respectively. Since defects and dislocations pin the martensite twin boundaries and obstruct their mobility, it is important to prevent the introduction of defects or dislocations into the solution-treated Ti 51 Ni 39 Cu 10 SMA to maintain its high inherent internal friction.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Inherent Internal Friction of Ti51Ni39Cu10 Shape Memory Alloy

Chang

2007

Mater. Trans.

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“…In addition, these variants do not increase during the austenite-martensite plateau. Under dynamical ac and dc tensile testing, Fan et al [9] have shown that the relaxation peak was due to the displacement of the austenite martensite interfaces under an applied stress. Consequently, in our case, it is assumed that with an imposed deformation of 4.0% and 6.3%, the generated martensite bands are almost similar, and for the both imposed strains, the relaxation mechanism is governed by the same number of austenite-martensite interfaces.…”

Section: Resultsmentioning

confidence: 99%

Effect of Hydrogen on the Stress Relaxation of Aged NiTi Shape Memory Alloys

2016

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The susceptibility of the NiTi shape memory alloy to relaxation after the hydrogen charging in an aqueous solution has been investigated with respect to ageing during one to six days in air at room temperature. The orthodontic wires have been prepared by immersing in a 0.9% NaCl solution for 3 h, under applied current density of 10 A/m 2 and then relaxed with an imposed deformation in a fully austenite state of structure and in a state with 1/3 and 2/3 of the martensite volume fraction. Through the stress relaxation, the hydrogen-charged specimen has shown a significant decrease of the stress, compared to the non-immersed alloy, when the imposed deformation was located in the plateau of the austenite-martensite transformation. It was also found that a longer ageing period is important and the properties of the wires with longer stress relaxation are similar to the those of non-charged wires. Nevertheless, no difference has been detected between the as-received and the as-charged specimens when the imposed deformation was located in the elastic deformation region of the fully austenitic structure. This behavior is attributed to the effect of the gradient of absorbed hydrogen, existing between the surface and the center axis of the studied wires, which facilitates the mobility of the martensite bands during the stress relaxation.

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“…Experimental observation on the role of dislocations together with the presence of hydrogen can be found in a recent paper [64]. In Shape Memory Alloys (SMA) equivalent studies of pinning processes of domain walls and their effect on aging has been clearly identified [65][66][67], in particular the role of dislocations during the first order martensitic transition [64,68,69].…”

Section: Phase Transitions 455mentioning

confidence: 99%

“…A, B, C and g are appropriate energy parameters which may either be determined experimentally [68,[70][71][72][73][74][75] or follow from energy calculations. The minimisation is usually performed via solving the time-dependent Euler-Lagrange equation in the steady state…”

Section: Structural Modifications Of Twin Walls: the Role Of The Secomentioning

confidence: 99%

Domain boundary engineering

2009

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Effects of frequency, composition, hydrogen and twin boundary density on the internal friction of Ti50Ni50−xCux shape memory alloys

Cited by 82 publications

References 28 publications

Inherent Internal Friction of Ti<SUB>51</SUB>Ni<SUB>39</SUB>Cu<SUB>10</SUB> Shape Memory Alloy

Inherent Internal Friction of Ti<SUB>51</SUB>Ni<SUB>39</SUB>Cu<SUB>10</SUB> Shape Memory Alloy

Effect of Hydrogen on the Stress Relaxation of Aged NiTi Shape Memory Alloys

Domain boundary engineering

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