Extraordinary high damping of hydrogen-doped NiTi and NiTiCu shape memory alloys

Biscarini, A.; Coluzzi, B.; Mazzolai, Giovanni; Tuissi, A.; Mazzolai, F.M.

doi:10.1016/s0925-8388(03)00267-6

Cited by 44 publications

(40 citation statements)

References 14 publications

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“…1) Among ternary TiNi-based SMAs, Ti 50 Ni 50Àx Cu x SMAs with x 5 30 at%, have been extensively examined from various aspects, such as the shape memory effect, [2][3][4] martensitic transformation behaviors, [5][6][7][8] mechanical characteristics, [9][10][11] microstructures, [12][13][14][15][16][17] internal friction, [18][19][20][21][22][23][24][25][26] etc. The transformation sequences of Ti 50 Ni 50Àx Cu x SMAs are B2 !B19 0 , B2 !B19 !B19 0 and B2 !B19 for x < 5, 5 5 x 5 20 and x > 20 at%, respectively.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti50Ni40Cu10 Shape Memory Alloy by Dynamic Mechanical Analyzer

Lin

Tsai

2008

Mater. Trans.

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The effect of thermal cycling on B2!B19!B19 0 transformations of cold-rolled and annealed Ti 50 Ni 40 Cu 10 SMA was examined by DMA. Experimental results point out the transformation peak temperature and its tan peak value of B19!B19 0 transformation are more suppressed by thermal cycling than those of B2!B19. This is because of the different microstructures between B19 and B19 0 martensites in which B19 is a defect-free martensite but B19 0 has plenty of twinning. Dislocations induced by thermal cycling can hinder the mobility of twin boundaries of B19 0 martensite and cause different thermal cycling effects on B2!B19 and B19!B19 0 transformations. Thermal cycling also shows an obvious effect on storage modulus E 0 values of B19 and B19 0 martensites and their E 0 values increase with increasing thermal cycles.

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Section: Introductionmentioning

confidence: 99%

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti50Ni40Cu10 Shape Memory Alloy by Dynamic Mechanical Analyzer

Lin

Tsai

2008

Mater. Trans.

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“…Hydrogen plays a crucial role in determining the damping properties of the martensites introducing new IF peaks and markedly affecting those usually exhibited by materials not intentionally doped with H. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]40 Understanding the damping spectrum of NiTi based SMA has been and still is a puzzling task, because preliminary treatments usually given to the materials before any experiment, such as solubilization in a static argon atmosphere followed by water quenching (treatment swq), lead to H contamination of the samples. This contamination, which first was assumed, 9 then experimentally proved, 19 involves amounts of H so small that their effects on physical properties are usually negligible.…”

Section: Phenomenology Of Damping Peaks In Martensitesmentioning

confidence: 99%

“…The presence of these peaks at around room temperature makes NiTiCu alloys interesting high damping materials, as it has been emphasized in a number of papers (Refs. [10][11][12]. Another well evident effect of H doping, apart from introducing P H and P TWH , is that of markedly reducing the background damping of the martensite at low temperature and of completely removing P 50K .…”

Section: According To Ref 23 the Temperatures T G Of The E(t) Dip Dementioning

confidence: 99%

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

Mazzolai¹

2011

AIP Advances

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This review is focused on the influence of interstitial hydrogen and alloy compositional changes on the internal friction (IF) spectrum and elastic Young's modulus (E) of NiTi based shape memory alloys. In the martensitically transforming binary alloys Ni50+xTi50-x (x≤1.3) vacuum annealed and furnace cooled (H-free), besides the well known IF peak associated with the martensitic transition two additional non-thermally activated peaks (P150K and P200K′) are present due to some sort of second-order phase transitions. In martensitically transforming Ni50+xTi50-x and Ti50Ni50-yCuy alloys doped with hydrogen two thermally activated peaks, PTWH and PH, appear which originate from stress-assisted motions of H-twin boundary complexes and isolated H-elastic dipoles (Snoek effect), respectively. In a H-free martensitically non-trasforming alloy (x=2), besides the non-thermally activated peak P150K, a frequency dependent dip is observed in the E(T) curves at a temperature Tg. This dip is similar to that reported in the literature for two other non-transforming alloys (x=1.5 and x=2.5), which, however, were also found to exhibit a thermally activated IF peak just below Tg. Most likely, these two alloys were contaminated with hydrogen during the preliminary solubilization in argon atmosphere and subsequent water quenching treatments given to them. The Young's modulus dip and the lower temperature IF peak have been both attributed to a novel type of phase transition reported in the literature as “strain glass transition”. The introduction of hydrogen into the non-transforming alloy with x=2 enhances the Young's modulus dip and gives rise to the H-Snoek peak PH just below Tg, which clearly appears to be the counterpart of the peak observed in the alloys (x=1.5 and x=2.5) solubilized in argon atmosphere and water quenched. The conclusion was reached in the present work that this last peak is not related to the strain glass transition but is rather an H-Snoek relaxation

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“…They reported that the functional fatigue resistance of NiTiCu SMAs is strongly improved by the addition of Cu. Sehitoglu et al [18,19] and Biscarini et al [20] investigated the mechanical properties of NiTiCu single crystal SMAs under compression loading, and reported that the slip resistance increases when Ni-rich precipitates are present. To date, the mechanical behavior of bulk NiTiCu SMA is well established [7,[14][15][16][17][18][19][21][22][23][24]; however, few studies have focused on the effect of porosity on NiTiCu SMAs [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties of NiTi-Based Foam with High Porosity for Implant Applications

Qiu

Young

2015

Shap. Mem. Superelasticity

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In order to better understand NiTi-based shape memory alloy foams for implant applications, Ni 40 Ti 50 Cu 10 foams were heat treated and then deformed under incremental and cyclic compression loading. After heat treatment, the microstructure consists of a (Ni,Cu)Ti matrix with small (Ni,Cu) 4 Ti 3 precipitates and a large Ti 2 (Ni,Cu) secondary phase. The heat-treated Ni 40 Ti 50 Cu 10 foam exhibits a two-step transformation, involving B19 0 ? B19 and B19 ? B2 on heating and B2 ? B19 and B19 ? B19 0 on cooling, respectively. One Ni 40 Ti 50 Cu 10 foam was compression loaded for 10 cycles at each subsequent strain level, i.e., 1, 2, 3, 4, 5, and 6 % strain. In each set of compressive stress-strain loops, the maximum stress level decreases due to plastic damage accumulation and/or retention of transformed martensite. Cross-sectional images from micro-computed tomography were collected during compression loading, which shows very uniform deformation without severe structural damage even up to 5 % strain. Localized deformation is visible at 6 % strain.

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Extraordinary high damping of hydrogen-doped NiTi and NiTiCu shape memory alloys

Cited by 44 publications

References 14 publications

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

Mechanical Properties of NiTi-Based Foam with High Porosity for Implant Applications

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Extraordinary high damping of hydrogen-doped NiTi and NiTiCu shape memory alloys

Cited by 44 publications

References 14 publications

The Effect of Thermal Cycling on B2&rarr;B19&rarr;B19&prime; Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

The Effect of Thermal Cycling on B2&rarr;B19&rarr;B19&prime; Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

Recent progresses in the understanding of the elastic and anelastic properties of H-free, H-doped and H-contaminated NiTi based alloys

Mechanical Properties of NiTi-Based Foam with High Porosity for Implant Applications

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Product

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The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer

The Effect of Thermal Cycling on B2→B19→B19′ Transformations of Ti<SUB>50</SUB>Ni<SUB>40</SUB>Cu<SUB>10</SUB> Shape Memory Alloy by Dynamic Mechanical Analyzer